RESUMEN

Background: The COVID-19 pandemic affected older adults worldwide. Sedentary older adults experienced more severe adverse health effects due to their shelter-in-place. Physical activity was strongly recommended during periods of social distancing. The present study evaluated the impact of a virtually supervised exercise program on the physical fitness and mental health of Mexican older adults during the pandemic's lockdown. Methods: Participants were 44 older adults who were assigned to one of four physical fitness groups: a healthy control group (Ctrl-H, n = 15), a comorbidity control group (Ctrl-COM, n = 9), an exercise group without comorbidities (Exe-H, n = 11), and an exercise group with comorbidities (Exe-COM, n = 9). The participants engaged in a 60-min, virtually-supervised concurrent exercise session three times/week for 12 weeks. Fitness was measured using the online Senior Fitness Tests and the 4-m Gait Speed Test. Mental health was evaluated through virtual interviews using the Hamilton Depression Rating Scale, the Geriatric Depression Scale, and the Connor-Davidson Resilience Scale. Within-subject pre vs. post-intervention comparisons tested for significant differences, between-groups and over time. Results: Significant interactions were found in the scores of the Geriatric Depression Scale (p ≤ 0.0001; ηp2 = 0.35), the Hamilton Depression Scale (p ≤ 0.0001; ηp2 = 0.35), resilience scores (p ≤ 0.0001; ηp2 = 0.46), lower-body strength (p ≤ 0.0001; ηp2 = 0.32), timed up-and-go test (p = 0.018; ηp2 = 0.18), the 6MWT distance scores (p ≤ 0.0001; ηp2 = 0.39), and the 4-m gait speed test scores (p = 0.011; ηp2 = 0.20). Conclusion: A long-term virtually-supervised exercise program conducted during the COVID-19 lockdown period led to marked improvements in both the fitness and mental health of older Mexican adults. Comorbidities did not diminish these benefits. These findings provide empirical support for online exercise programs in the daily routines of older adults to make clinically meaningful improvements in both physical and mental well-being.

Asunto(s)

RESUMEN

We studied the effect of exercise-induced body fluid redistribution on dual-energy x-ray absorptiometry (DXA) body composition scores. Thirty males completed 30-min of upper-body exercise (UBE), lower-body exercise, and seated non-exercise control (NEC). ANOVA determined interactions between experimental conditions and measurements on body composition variables. For UBE, mean pre to post differences were found on tissue fat (M = 0.35 ± 0.12%; CI95%diff = 0.10 to 0.59%; p = 0.007), region fat (M = 0.32 ± 0.11%; CI95%diff = 0.09 to 0.55%; p = 0.008), lean mass (M = 0.27 ± 0.01 kg; CI95%diff = 0.18 to 0.37 kg; p ≤ 0.0001), and total mass (M = 0.27 ± 0.05 kg; CI95%diff = 0.17 to 0.36 kg; p ≤ 0.0001). Mean tissue pre to post differences were found for the total body in the NEC (M = 0.10 ± 0.04 kg; CI95%diff = 0.03 to 0.18 kg; p = 0.008), UBE (M = 0.19 ± 0.03 kg; CI95%diff = 0.14 to 0.24 kg; p ≤ 0.0001), and LBE (M = 0.31 ± 0.04 kg; CI95%diff = 0.24 to 0.39 kg; p ≤ 0.0001) conditions. High absolute reliability was found within experimental conditions. These findings have practical implications for technicians, since acute exercise elicited small changes in body composition scores using DXA.

Asunto(s)

RESUMEN

BACKGROUND: Scarce evidence exists on barriers to physical activity in Mexican women. Despite evidence from other countries, no research has investigated the influence of the breast on PA in this population. OBJECTIVE: To determine the association between the breast and physical activity in Mexican women. DESIGN: Cross-sectional observational study. METHODS: Volunteers were 279 Mexican women from Veracruz, Durango, and Baja California states, who completed a paper survey of their demographics, brassiere characteristics, breast pain, and frequency and amounts of weekly physical activity. RESULTS: The first barrier to physical activity was time constraints, followed by breast-related issues. Breast pain was reported by 47.1% of women, and the breast as a barrier to physical activity participation was reported by 30.6%. Responses, such as "I am embarrassed by excessive breast movement" and "My breasts are too big" were the most frequently reported breast-related barriers to physical activity. Breast pain was associated with the menstrual cycle and exercise. Breast health knowledge and pain intensity were unrelated to moderate- and vigorous-intensity physical activity. The 36.4% and 6.7% of women did not meet weekly moderate- and vigorous-intensity physical activity guidelines, respectively. Weekly moderate- and vigorous-intensity physical activity was similar between women reporting breast pain and those who did not. CONCLUSIONS: Because the breast was the second most significant barrier to physical activity, it is imperative to increase breast health knowledge in Mexican women to reduce impediments to physical activity.

Perception of Mexican women regarding their breasts as a barrier to physical activityPhysical activity provides numerous health benefits, sometimes associated with reversing or delaying several diseases. However, barriers to increasing physical activity in women remain, as the breast is an anatomical aspect that is unique to women. Breast pain has been reported in more than 50% of women who perform physical exercise. Therefore, the study aimed to determine the associations between breast characteristics and barriers to physical activity in Mexican women. Two hundred and seventy-nine women from three Mexican states voluntarily participated in the study. They answered survey questions on the history of bra use, barriers to physical activity, and essential demographic characteristics. The main findings of this study were that issues related to the breasts were reported as the second barrier to physical activity participation. In addition, time constraints were reported as the main reason impeding physical activity participation. Public health initiatives should support attempts to increase breast satisfaction among women of all breast sizes to stimulate engagement in physical activity throughout their lives.

Asunto(s)

RESUMEN

BACKGROUND: Dual-energy X-ray absorptiometry (DXA) measures are affected by the noise produced by external factors such as textile compression found in loose clothing. The study aimed to determine the effect of a compression bandage (CB) on body composition (BC) assessed by DXA. METHODS: Sixty volunteers (age=21.4±4.7yr.) underwent full-body DXA scans on a control (CTRL) condition and after wearing a 30-mmHg CB on the trunk, legs, and arms. ANOVA (2 genders by 2 experimental conditions) determined mean interactions in BC variables tissue body fat% (BF%), region body fat% (RBF%), body tissue (BT), fat mass (FM), lean mass (LM), bone mineral content (BMC), and total mass (TM). Absolute reliability in BC scores was studied by the typical error of the measurement (TEM), the coefficient of variability (CV), and Bland-Altman plots. RESULTS: ANOVA interactions were found on tissue total BF% (p=0.049), RBF% (p=0.048), android lean mass (p=0.004), and android total mass (p=0.019). The CV was small for tissue BF% (2.61±0.93%, CI95%=0.79, 4.43%), RBF% (2.66±1.78%, CI95%=-0.83, 6.15%), BT (4.82±2.19%, CI95%=0.54, 9.10kg), FM (4.17±2.25%, CI95%=-0.24, 8.58kg), LM (3.25±2.44%, CI95%=-1.53, 8.04kg), BMC (4.81±2.96%, CI95%=-0.99, 10.62kg), and TM (2.84±2.80%, CI95%=-2.65, 8.33kg). Bland-Altman plots showed random error for BF%, LM, and BMC. A bias of 0.5% was observed on BF% in males. CONCLUSION: A CB worn during a full-body DXA scan elicited similar BC scores than not wearing it. The variation in scores was <10% for most BC variables, and a trivial bias of 0.5% in BF% was detected in male scores.

Asunto(s)

RESUMEN

BACKGROUND: Valid and reliable measurements are necessary to understand and monitor age-related changes. AIMS: To describe the factor structure and provide validity evidence of a neuropsychological and a physical testing batteries using factor analysis. METHODS: We performed a secondary analysis of data from the Epidemiology and Development of Alzheimer's Disease (EDAD) project. Community-dwelling adults aged 55 to 85 years underwent comprehensive physical and neuropsychological assessments. An exploratory factor analysis was performed on both assessment batteries. The models were later confirmed with a random subsample using confirmatory factor analysis. RESULTS: Data from 238 adults (163 females and 75 males) was included. The neuropsychological model revealed a four-factor structure formed by "Executive Functioning", "Verbal Memory", "Logical Memory", and "Labeling And Reading" (Extraction Sums of Squared Loadings [ESSL] = 56.41% explained variance; Standardized Root Mean Square Residual [SRMSR] = 0.06; Comparative Fit Index [CFI] = 0.98). The physical model was formed by a two-factor structure including "Health-related Fitness and "Functional Fitness" (ESSL = 50.54% explained variance; SRMSR = 0.07; CFI = 0.93). DISCUSSION: To our knowledge, this is the first study to analyze the structure of comprehensive testing batteries for the Latin-American older adults. Our analysis contributes to the understanding of theoretical constructs that are evaluated in the EDAD project. CONCLUSION: Our findings provide validity evidence for simplified and reduced testing batteries, which imply shorter testing times and fewer resources.

Asunto(s)

RESUMEN

Sarcopenia and disability in older adults are often characterized by body composition measurements; however, the gold standard of body composition measurement, dual-energy X-ray absorptiometry (DEXA), is expensive to acquire and maintain, making its use in low and middle income countries (LMIC) it out-of-reach in developing nations. Because these LMIC will bear a disproportionate amount of chronic disease burden due to global aging trends, it is important that reliable, low-cost surrogates need to be developed. Handgrip strength (HGS) is a reliable measure of disability in older adults but has not been used widely in diverse populations. This study compared HGS to multiple measurements of body composition in older adults from the US (Kansas) and a middle-income country (Costa Rica) to test if HGS is a cross-culturally appropriate predictive measure that yields reliable estimates across developed and developing nations. Percent body fat (%BF), lean tissue mass index (LTMI), appendicular lean soft tissue index (ALSTI), body fat mass index (BFMI), bone mineral density (BMD), and HGS were measured in older Costa Ricans (n = 78) and Kansans (n = 100). HGS predicted lean arm mass with equal accuracy for both samples (p ≤ 0.05 for all groups), indicating that it is a reliable, low-cost and widely available estimate of upper body lean muscle mass. Older adults from Costa Rica showed different body composition overall and HGS than controls from Kansas. Handgrip operates equivalently in the US and Mesoamerica and is a valid estimate of lean arm muscle mass as derived by the more expensive DEXA.

Asunto(s)

RESUMEN

Resumen: Los programas de ejercicio en el medio acuático proporcionan un ambiente motivante y divertido, en el cual las personas con discapacidad intelectual pueden realizar actividades deportivas o recreativas de manera accesible, lo que incide positivamente en la condición física. Propósito: El objetivo de la revisión sistemática fue conocer los efectos del ejercicio acuático sobre la aptitud física en personas con discapacidad intelectual. Metodología: Para lograr el propósito del estudio, se llevó a cabo una búsqueda de literatura en las bases de datos Sport Discus, Science Direct, Scopus y PubMed, cuyas publicaciones comprenden del 2009 al 2018; como criterios de inclusión debían especificar el tipo de ejercicio, los componentes de la carga de entrenamiento, el tipo de discapacidad que presentaban los sujetos del estudio y que la duración de la intervención fue mayor a 4 semanas. Resultados: Solamente 5 trabajos cumplieron los criterios de selección. Aquellos en los que aplicaron intervenciones de natación y ejercicio combinado indicaron que se mejoraron elementos de la aptitud física importantes para la salud, así como el desenvolvimiento de actividades de la vida diaria. Se pudo concluir que se requieren investigaciones con mayor rigor metodológico, para clarificar el efecto del ejercicio en el medio acuático sobre los componentes de la aptitud física en personas con discapacidad intelectual.

Abstract: Exercise programs in aquatic environments guarantee a motivating and fun environment in which people with intellectual disabilities can carry out sports or recreational activities in an accessible way, which has a positive effect on their physical condition. Purpose: the objective of the systematic review was to know the effects of aquatic exercise on physical fitness in people with intellectual disabilities. Methodology: To achieve the purpose of the study, a literature search was conducted in the Sport Discus, Science Direct, Scopus, and PubMed databases, whose publications cover from 2009 to 2018. As selection criteria, these publications had to specify the type of exercise, the components of a load of training, the type of disability presented by the study subjects, and the duration of the intervention that should be greater than four weeks. Results: Only five studies met the selection criteria. the studies in which they applied swimming interruption and combined exercise showed that components of physical fitness important for health were improved, as well as the development of activities of daily living. It was concluded that studies with greater methodological rigor are required to clarify the effect of exercise in aquatic environments on the components of physical fitness in people with intellectual disabilities.

Resumo: Os programas de exercícios aquáticos proporcionam um ambiente motivador e divertido no qual pessoas com deficiências intelectuais podem praticar esportes ou atividades recreativas de maneira acessível, o que tem um impacto positivo sobre a condição física. Objetivo: O objetivo da revisão sistemática era descobrir os efeitos do exercício aquático sobre a aptidão física das pessoas com deficiência intelectual. Metodologia: Para atingir o objetivo do estudo, foi feita uma pesquisa bibliográfica nas bases de dados Sport Discus, Science Direct, Scopus e PubMed, cujas publicações foram de 2009 a 2018. Como critérios de seleção, essas publicações tinham que especificar o tipo de exercício, os componentes de uma carga de treinamento, o tipo de deficiência apresentada pelos sujeitos do estudo e a duração da intervenção que devia ser superior a quatro semanas. Resultados: Apenas cinco estudos cumpriram os critérios de seleção. Os estudos nos quais foram aplicados intervenções de natação e exercícios combinados indicaram que os componentes de aptidão física importantes para a saúde, assim como no desempenho das atividades da vida diária, foram melhorados. Concluiu-se que são necessários estudos com maior rigor metodológico para esclarecer o efeito do exercício aquático sobre os componentes da aptidão física das pessoas com deficiência intelectual.

Asunto(s)

RESUMEN

ABSTRACT: Briceño-Torres, JM, Carpio-Rivera, E, Solera-Herrera, A, Forsse, J, Grandjean, PW, and Moncada-Jiménez, J. Low-intensity resistance training improves flow-mediated dilation in young hispanic adults. J Strength Cond Res 37(2): 298-304, 2023-The purpose of this study was to compare the effects of 2 resistance exercise training (RET) intensities on brachial artery flow-mediated dilatation (FMD) in sedentary males. Thirty-four men (age = 20.6 ± 1.8 years, height = 171.3 ± 5.2 cm, body mass = 65.2 ± 10.6 kg, and DXA fat mass = 22.3 ± 7.4%) were randomly assigned to a control group (no exercise CTRL, n = 12), RET at 50% of 1 repetition maximum (1RM) (RET50%, n = 12), and RET at 80% 1RM (RET80%, n = 10). The RET program was performed twice per week for 8 weeks; subjects performed the same RET exercises at similar total workloads (1920 arbitrary units [AUs] for the RET80% and 1950 AUs for the RET50%). The FMD% was measured before and after 8 weeks by ultrasound. Mixed factorial analysis of variance (3 groups × 2 measurements), effect size (ES), and 95% confidence intervals (95% CIs) were computed for FMD%. The level of significance was set at p ≤ 0.05. A significant increase ( p = 0.001) was found on post-test FMD% in RET50% (mean = 9.9 ± 3.7%, ES = 1.9, and 95% CIs = 2.8-0.9) compared with CTRL (mean = 5.7 ± 1.7%, ES = 0.2, and 95% CIs = -0.4 to 0.8), and there were no significant differences found between RET50% and RET80% and between RET80% and CTRL. Results support the concept of training specificity and provide preliminary evidence that lower resistance and higher repetition RET elicit greater short-term reduced endothelium dysfunction than higher intensity RET at similar training volume.

Asunto(s)

RESUMEN

This study aimed to determine the body composition profile of candidates applying for a Physical Education and Sports major. 327 young adults (F: 87, M: 240) participated in this cross-sectional study. Nutritional status and body composition analysis were performed, and the profiles were generated using an unsupervised machine learning algorithm. Body mass index (BMI), percentage of fat mass (%FM), percentage of muscle mass (%MM), metabolic age (MA), basal metabolic rate (BMR), and visceral fat level (VFL) were used as input variables. BMI values were normal-weight although VFL was significantly higher in men (<0.001; η2 = 0.104). MA was positively correlated with BMR (0.81 [0.77, 0.85]; p < 0.01), BMI (0.87 [0.84, 0.90]; p < 0.01), and VFL (0.77 [0.72, 0.81]; p < 0.01). The hierarchical clustering analysis revealed two significantly different age-independent profiles: Cluster 1 (n = 265), applicants of both sexes that were shorter, lighter, with lower adiposity and higher lean mass; and, Cluster 2 (n = 62), a group of overweight male applicants with higher VFL, taller, with lower %MM and estimated energy expended at rest. We identified two profiles that might help universities, counselors and teachers/lecturers to identify applicants in which is necessary to increase physical activity levels and improve dietary habits.

Asunto(s)

RESUMEN

Purpose. To evaluate changes in walk test performance and blood pressure (BP) responses following a 12-week exercise-based outpatient cardiac rehabilitation (CR) program. Methods. Six-Minute Walk Test (6MWT) and resting systolic BP (SBP), diastolic BP (DBP), post-6MWT heart rate (HR), and post-6MWT BPs were measured before and after CR in 311 (237 men,74 women) patients. Using age as a covariate, 2 by 2 (Gender × Measurement) ANCOVAs were used to determine differences in 6MWT performance and hemodynamic variables. Results. After adjusting for age, men covered a greater 6MWT distance than women; pre-CR versus post-CR program values are as follows: men, 429.3 ± 94.6 versus 557.6 ± 90.7 m, P ≤ .001; women, 374.9 ± 100.7 versus 483.2 ± 82.9 m, P ≤ .001. Both genders reduced resting DBP following the CR program (men: 67.2 ± 9.8 vs 65.6 ± 8.5 mm Hg, P = .034; women: 69.2 ± 10.7 vs 65.0 ± 8.0 mm Hg, P = .001) and increased HR following the 6MWT after the CR program (men: 97.7 ± 16.8 vs 112.7 ± 21.3 bpm, P ≤ .001; women: 100.7 ± 20.8 vs 110.2 ± 22.0 bpm, P ≤ .001). Similarly, SBP increased immediately following the 6MWT (122.8 ± 18.5 vs 133.6 ± 20.7 mm Hg; P ≤ .001) in men but not in women. Conclusion. The present findings indicate similar relative improvements in 6MWT performance and BP responses in adherent men and women following an exercise-based CR program.

RESUMEN

ABSTRACT Objective Evidence regarding sleep quality in older adults residing in urban and rural areas is lacking among Latino populations living outside the United States. The purpose of the study was to compare the perceived sleep quality of older adults from Costa Rica in urban and rural areas. Methods Volunteers were 52 urban and 30 rural older adults who completed anthropometric measures, cognitive screening, demographic information, and the Pittsburgh Sleep Quality Index questionnaire (PSQI). Non-parametric Mann-Whitney U tests determined differences on subjective sleep quality, sleep latency, sleep duration, habitual sleep efficiency, sleep disturbances, use of sleep medication, sleep daily dysfunction, and global PSQI. Multiple regression analyses determined sociodemographic predictors of sleep quality. Results Regardless of the residency zone, older adults showed similar subjective sleep quality (p=0.077), sleep latency (p=0.863), sleep duration (p=0.316), sleep efficiency (p=0.613), use of sleep medication (p=0.207), and total PSQI score (p=0.270). Sleep perturbation (p=0.009) and sleep daily dysfunction (p=0.019) were higher in rural than in urban older adults. Education predicted sleep perturbation (p=-0.266, p=0.049, R2 =0.17). Age (p=-0.309, p=0.025) and residency region (P=0.346, p=0.024) predicted sleep daily dysfunction (R2=0.196). Conclusion Most sleep quality measures were similar between older adults residing in urban and rural zones. Low education predicted sleep perturbation regardless of the residency zone; and younger age and urban zone predicted higher sleep daily dysfunction.

RESUMEN Objetivo Evidencia sobre la calidad del sueño en adultos mayores que residen en áreas urbanas y rurales es escasa en las poblaciones latinas que viven fuera de los Estados Unidos. El propósito del estudio fue comparar la percepción de la calidad del sueño de adultos mayores de Costa Rica de zonas urbanas y rurales. Métodos Los voluntarios fueron 52 adultos mayores residentes en zonas urbanas y 30 en zonas rurales, quienes completaron medidas antropométricas, evaluación cognitiva, información demográfica y el cuestionario del Índice de Calidad del Sueño de Pittsburgh (PSQI). Las pruebas no paramétricas U de Mann-Whitney determinaron diferencias en la calidad subjetiva del sueño, la latencia del sueño, la duración del sueño, la eficiencia habitual del sueño, los trastornos del sueño, el uso de medicamentos para dormir, la disfunción diaria del sueño y el PSQI global. Resultados Independientemente de la zona de residencia, los adultos mayores mostraron similar calidad subjetiva del sueño (p=0.077), latencia del sueño (p=0.863), duración del sueño (p=0.316), eficiencia del sueño (p=0.613), uso de medicamentos para dormir (p=0.207) y puntuación total del PSQI (p=0.270). La perturbación del sueño (p=0.009) y la disfunción diaria del sueño (p=0.019) fueron mayores en los adultos mayores rurales que en los urbanos. Conclusión La mayoría de las medidas de calidad del sueño fueron similares entre los adultos mayores que residen en zonas urbanas y rurales. La baja educación predijo la perturbación del sueño independientemente de la zona de residencia, mientras que la edad más joven y la zona urbana predijeron una mayor disfunción diaria del sueño.

RESUMEN

The consumption of sugar-sweetened beverages has been associated with the onset of cardiometabolic diseases. The aim of this study was to describe consumption patterns of sugar-sweetened and dairy beverages and to evaluate their correlation with the body mass index in children residing at the Mexico−USA border. A total of 722 (370 girls, 352 boys) elementary school children aged 9 to 12 years from Tijuana, Mexico, participated in the study. Anthropometric measures were recorded, and a beverage intake questionnaire was completed by the children's parents. Significant age by sex interactions were found on body mass index Z-scores (p < 0.01). Boys showed higher sugar intake (p < 0.05) and total relative energy consumption from sugar (p < 0.05) than girls. The energy consumption from sugar-sweetened and dairy beverages was similar between sexes (p > 0.05). Sugar intake from beverages was higher than the limit recommended by the World Health Organization in boys (66%) and girls (44%). A high frequency of consumption of sugar-sweetened beverages and similar intake of dairy beverages were found in children from the Mexico−USA border. The high consumption of sugar exceeds international recommendations and should be carefully monitored.

Asunto(s)

RESUMEN

BACKGROUND/OBJECTIVE: The quarantine caused by the COVID-19 pandemic increased sedentary behavior, psychological stress, and sleep disturbances in the population favoring the installation of alterations in the cardiovascular system. In this sense, physical exercise has widely been suggested as an efficient treatment to improve health. The current study determined the impact of short-term high-intensity circuit training (HICT) on resting heart rate variability (HRV) in adults. METHODS: Nine healthy participants (age: 31.9 ± 4.4 yr.) performed 36 HICT sessions (3 times per day; 3 days per week) and four participants (age: 29.5 ± 1.7 yr.) were assigned to a control group. The HICT consisted of 12 min of whole-body exercises performed during a workout. Twenty-four hours before and after the exercise program, HRV parameters were recorded. RESULTS: The heart rate exercise during the last session trended to be lower when compared with the first HICT session (p = 0.07, d = 0.39, 95% CI = -13.50, 0.72). The interval training did not modify the HRV time (Mean NN, SDNN, RMSSD, NN50, pNN50) and frequency (LF, HF, LF/HF ratio, total power) domain parameters. CONCLUSION: Thirty-six HICT sessions did not provide enough stimuli to modify the resting HRV in adults during social isolation elicited by the COVID-19 pandemic. However, the data suggested that exercise protocol did not induce cardio-vagal adaptations.

Asunto(s)

RESUMEN

Since 2020, the world has been suffering from a pandemic that has affected thousands of people regardless of socio-economic conditions, forcing the population to adopt different strategies to prevent and control the advance of the disease, one of which is social distancing. Even though social distancing is a safe strategy to reduce the spread of COVID-19, it is also the cause of a rising sedentary behavior. This behavior develops an excess of fat tissue that leads to metabolic and inflammatory disruption related to chronic diseases and mental health disorders, such as anxiety, depression, and sleep issues. Furthermore, the adoption of dietary patterns involving the consumption of ultra-processed foods, higher in fats and sugars, and the reduction of fresh and healthy foods may play a role in the progress of the disease. In this perspective, we will discuss how an unhealthy diet can affect brain function and, consequently, be a risk factor for mental health diseases.

RESUMEN

Background: Human brain function declines with aging. In this sense, exercise-based interventions has a promising effect on brain plasticity for older adults. Serum brain-derived neurotrophic factor (BDNF) is a positive biomarker for brain neuroplasticity in healthy older adults also modified by exercise training. Selected features of the exercise prescription for improving brain health are missing; therefore, the aim of this study was to determine the effects of concurrent exercise training frequency on serum BDNF levels in healthy older adults. Methods: Nineteen volunteers (age: 65 ± 4 year; body mass index: 28.0 ± 4.5 kg/m2) completed either a three times/week (3-t/w) (n = 8) or five times/week (5-t/w) (n = 11) concurrent exercise program. The exercise program lasted 11 weeks and all exercise sessions were performed for 50 min at moderate intensity. Serum BDNF, body composition, cardiovascular, and physical fitness variables were assessed before and after the exercise training program. Results: Regardless of the group, the serum BDNF increased following the intervention (p < 0.001), and there were no significant group (p = 0.827) or interaction (p = 0.063) effects. The maximal oxygen consumption (VO2max) increased regardless of the group (p = 0.007), with a non-significant group (p = 0.722) or interaction (p = 0.223) effects. Upper- and lower-body strength increased in both groups (p = 0.003); however, there was no effect of the training frequency (p = 0.53). For the skeletal muscle mass, there was a trend in the interaction effect (p = 0.053). Finally, the body fat percentage was unchanged. Conclusion: Eleven weeks of combined exercise training increased serum BDNF levels in healthy older adults, a response independent of the training frequency. The overall fitness level improved similarly in both exercise groups. These data reveal that a minimal dosage of concurrent exercise enhance functional capacity and a brain health biomarker in older adults.

RESUMEN

Abstract Objective. To determine the association between perceived exertion (RPE) and physiological variables and to determine the predictive factors of RPE during submaximal and maximal exertion in older adults. Method. Older adults from Kansas (n = 100) and Costa Rica (n = 79) performed a submaximal and maximal stress test. RPE, education level and a total score of cognitive function (CFTS) were collected. Correlation and multiple regression analyses were computed using RPE as the criterion variable and oxygen consumption (VO2), respiratory exchange ratio (RER), CFTS and education level as predictors. Results. There was a significant correlation between VEP and RER (r = 0.22, p = 0.029) at maximal exertion. The RPE predictors for women were VO2, RER, and CFTS at different stages of the test. For men, VEP was predicted by RER, education level, and VO2 at different stages. Conclusion. Metabolic and physiological variables predicted RPE in older adults. Age, cognition, and heart rate were unrelated to RPE at maximal exertion, and RER predicted RPE scores during submaximal and maximal exertion.

Resumen Objetivo. Determinar la asociación entre el esfuerzo percibido (VEP) y variables fisiológicas y determinar los factores predictivos de VEP durante el esfuerzo submáximo y máximo en adultos mayores. Método. Adultos mayores de Kansas (n = 100) y Costa Rica (n = 79) realizaron una prueba de esfuerzo submáxima y máxima. Se recopiló la VEP, nivel de educación y una puntuación total de la función cognitiva (PTFC). Se usaron análisis de correlación y regresión múltiple utilizando VEP como variable criterio y el consumo de oxígeno (VO2), tasa de intercambio respiratorio (RER), PTFC y nivel de educación como predictores. Resultados. Se encontró una correlación significativa entre la VEP y la RER (r = 0.22, p = 0.029) en el esfuerzo máximo. Los predictores de VEP para las mujeres fueron VO2, RER y PTFC en diferentes etapas de la prueba. Para los hombres, la VEP fue predicha por RER, nivel de educación y VO2 en diferentes etapas. Conclusión. Las variables metabólicas y fisiológicas predijeron los valores de VEP en adultos mayores. La edad, la cognición y la FC no se relacionaron con la VEP en el esfuerzo máximo y la RER predijo las puntuaciones de la VEP durante el esfuerzo submáximo y máximo.

Resumo Escopo. Determinar a associação entre o esforço percebido (VEP) e as variáveis fisiológicas e determinar os fatores preditivos de VEP durante o esforço submáximo e máximo em idosos. Metodologia. Idosos de Kansas (n= 100) e Costa Rica (n= 79) realizaram uma prova de esforço submáxima e máxima. Foi recopilada o VEP, nível de educação e pontuação total da função cognitiva (PTFCO. Foram usadas análises de correlação e regressão múltipla utilizando VEP como variável critério e o consumo de oxigeno (VO2), taxa de intercambio respiratório (RER), PTFC e nível de educação como preditores. Resultados. Foi encontrada uma correlação significativa entre a VEP e a RER (r = 0.22, p = 0.029)) no esforço máximo. Os preditores de VEP para as mulheres foram VO2, RER e PTFC em diferentes etapas da prova. Para os homens, a VEP foi predita por RER, nível de educação e VO2 em diferentes etapas. Conclusão. As variáveis metabólicas e fisiológicas predisseram os valores de VEP em idosos. A idade, a cognição e a FC não estiveram relacionadas com a VEP no esforço máximo e a RER predizia as pontuações da VEP durante o esforço submáximo e máximo.

RESUMEN

Perceived lack of time is one of the most often cited barriers to exercise participation. High intensity interval training has become a popular training modality that incorporates intervals of maximal and low-intensity exercise with a time commitment usually shorter than 30 min. The purpose of this study was to examine the effects of short-term run interval training (RIT) on body composition (BC) and cardiorespiratory responses in undergraduate college students. Nineteen males (21.5 ± 1.6 years) were randomly assigned to a non-exercise control (CON, n = 10) or RIT (n = 9). Baseline measurements of systolic and diastolic blood pressure, resting heart rate (HRrest), double product (DP) and BC were obtained from both groups. VO2max and running speed associated with VO2peak (sVO2peak) were then measured. RIT consisted of three running treadmill sessions per week over 4 weeks (intervals at 100% sVO2peak, recovery periods at 40% sVO2peak). There were no differences in post-training BC or VO2max between groups (p > 0.05). HRrest (p = 0.006) and DP (p ≤ 0.001) were lower in the RIT group compared to CON at completion of the study. RIT lowered HRrest and DP in the absence of appreciable BC and VO2max changes. Thereby, RIT could be an alternative model of training to diminish health-related risk factors in undergraduate college students.

Asunto(s)

RESUMEN

Abstract Objective: The purpose of the study was to develop normative data for anthropometric, adiposity and upper body strength in Costa Rican adults 60 to 110 years old. Method: A representative sample of Costa Rican male and female older adults (n= 2 711) were assessed for body weight and height, knee height, waist, hip and arm circumferences, adiposity, and upper-body strength. The 10th, 25th, 50th, 75th, and 90th percentiles were selected as the normative reference points for each 10-year age groups (60-69, 70-79, 80-89, 90-99, and ≥100). Results: Men and women experience age-related increased adiposity and reductions in upper body strength; however, men increased their upper-body strength at older ages. Conclusion: The normative values allow health professionals to monitor anthropometric, adiposity, and upper-body strength in older adults, and to design comprehensive fitness interventions that promote a healthy lifestyle in the population.

Resumen Objetivo: El propósito del estudio fue desarrollar datos normativos para antropometría, adiposidad y fuerza de la parte superior del cuerpo en adultos costarricenses de 60 a 110 años de edad. Método: Se evaluó una muestra representativa de adultos mayores costarricenses varones y mujeres (n = 2 711) para determinar el peso y la talla corporal, la altura de la rodilla, la cintura, las circunferencias de la cadera y el brazo, la adiposidad y la fuerza de la parte superior del cuerpo. Los percentiles 10, 25, 50, 75 y 90 se seleccionaron como puntos de referencia normativos para cada grupo de edad de 10 años (60-69, 70-79, 80-89, 90-99 y ≥100). Resultados: Los hombres y las mujeres experimentan una mayor adiposidad relacionada con la edad y reducciones en la fuerza de la parte superior del cuerpo; sin embargo, los hombres aumentaron la fuerza de la parte superior del cuerpo a edades más avanzadas. Conclusión: Los valores normativos permiten a los profesionales de la salud monitorear antropometría, adiposidad y fuerza de la parte superior del cuerpo en adultos mayores, y diseñar intervenciones integrales de acondicionamiento físico que promuevan un estilo de vida saludable en la población.

Asunto(s)

RESUMEN

Objective: The purpose of the study was to determine perception of videogames and the use Pokémon Go in Costa Rica. Materials and Methods: A national representative sample (n = 1059) of adults aged 18 years and older was chosen to complete a face-to-face survey on videogame perceptions and the use of Pokémon Go. Statistical analyses included 95% confidence intervals (95% CI) around the estimate, multiple regression, cluster, and factor analysis. Results: The 85.2% of the population (n = 866) were familiar with videogames, especially those in the 18- to 29-year age group (96.3%) and college education (94.8%). Perceptions about videogames were negative (Addictive = 89.6%, Violence = 75.5%, Bad for health = 51.3%) and positive (Stimulate mental abilities = 59.6%, Relaxing = 55.2%, Improve family communication = 49.4%); and 28.4% perceived that people without responsibilities played videogames. Perceptions were different by age group and educational level. Age and gender were significant predictors of attitudes toward videogame playing. Pokémon Go was played by 3.9% of those respondents who knew or had heard about videogames, who reported spending 6.7 h/week (95% CI = 3.9-9.5) playing the game, walking 24.7 km (95% CI = 12.5-36.9), and covering 70.4 km (95% CI = 45.3-95.5) by other transportation means. Conclusions: Positive and negative perceptions toward videogames mediated by age and education level were found in a Costa Rican sample. Age and gender predicted attitudes toward videogame playing. A small number of participants played Pokémon Go, which might suggest that this videogame was not engaging in this population.

Asunto(s)

RESUMEN

The brain-derived neurotrophic factor (BDNF) is a protein mainly synthetized in the neurons. Early evidence showed that BDNF participates in cognitive processes as measured at the hippocampus. This neurotrophin is as a reliable marker of brain function; moreover, recent studies have demonstrated that BDNF participates in physiological processes such as glucose homeostasis and lipid metabolism. The BDNF has been also studied using the exercise paradigm to determine its response to different exercise modalities; therefore, BDNF is considered a new member of the exercise-related molecules. The high-intensity interval training (HIIT) is an exercise protocol characterized by low work volume performed at a high intensity [i.e., ≥80% of maximal heart rate (HRmax)]. Recent evidence supports the contention that HIIT elicits higher fat oxidation in skeletal muscle than other forms of exercise. Similarly, HIIT is a good stimulus to increase maximal oxygen uptake (VO2max). Few studies have investigated the impact of HIIT on the BDNF response. The present work summarizes the effects of acute and long-term HIIT on BDNF.