RESUMEN

The maximum growth rate (µmax) of Bacillus cereus was estimated using a non-destructive isothermal calorimetric method, and a growth prediction model was constructed based on the measurement results. SCD medium and mashed potato were inoculated with serial-diluted inoculum of B. cereus. Heat generation curves were determined using an isothermal calorimeter at 35, 25, and 15℃. The µmax was determined from the relationship between the increase in B. cereus cell number and incubation time, which was detected through the heat generation of the B. cereus biological process. Moreover, the growth prediction model was constructed using Ratkowsky's square-root model. The results of the growth prediction model based on the data of the calorimetric and conventional culture methods for SCD were expressed as √µCalmax=0.0354 (T-4.9)[R2=0.99] and √µCCMmax=0.0335 (T-5.0)[R2=0.99]; a similar equation was provided by both methods. Conversely, the results of the growth prediction model based on the calorimetric method data for mashed potato were given as √µCalmax=0.0390 (T-8.5)[R2=0.99]; the maximum growth rates at 30 and 20℃ were predicted as 0.70 and 0.20 (1/hr), respectively. The maximum growth rates obtained using the conventional culture method were 0.63 and 0.29 (1/hr), respectively, similar to the calorimetric method results. The predictive microbiological analysis using the calorimetric method enabled the rapid provision of a growth prediction equation, and the number of samples could be substantially reduced compared with that for the conventional culture method.

Asunto(s)

RESUMEN

Calcium phosphates are key biomaterials in dental treatment and bone regeneration. Biomaterials must exhibit antibacterial properties to prevent microbial infection in implantation frameworks. Previously, we developed various types of calcium phosphate powders (amorphous calcium phosphate, octacalcium phosphate (OCP), dicalcium phosphate anhydrate, and hydroxyapatite) with adsorbed protamine (which is a protein with antibacterial property) and confirmed their antibacterial property. In this study, as foundational research for the development of novel oral care materials, we synthesized calcium phosphate composite powders from three starting materials: i) OCP, which intercalates organic compounds, ii) protamine, which has antibacterial properties, and iii) F- ion, which promotes the formation of apatite crystals. Through investigating the preparation concentration of the F- ions and their loading into OCP, it was found that more F- ion could be loaded at higher concentrations regardless of the loading method. It was also observed that the higher the preparation concentration, the more the OCP converted to fluorapatite. The synthesized calcium phosphate composite powders were evaluated for biocompatibility through proliferation of MG-63 cells, with none of the powders exhibiting any growth inhibition. Antimicrobial tests showed that the calcium phosphate composite powders synthesized with protamine and F- ion by precipitation had enhanced antimicrobial properties than those synthesized by protamine adsorption. Thus, the calcium phosphate composite powder prepared from OCP, protamine, and F- ion forms the basis for promising antimicrobial biomaterials. Graphical abstract.

Asunto(s)

RESUMEN

Protamine is an antimicrobial peptide extracted from fish. In this study, we loaded protamine onto dicalcium phosphate anhydride (DCPA), a dental material. Protamine was loaded by stirring DCPA into a protamine solution. To explore the antimicrobial activity of the materials, we cultivated Streptococcus mutans on fabricated discs for 24 h. When S. mutans was cultivated on the discs under no sucrose conditions, the loaded protamine was not released, and the ratio of dead bacteria increased on the surface of P (125) DCPA (half of the saturated level of protamine (125 ppm protamine) was loaded). Aside from P (500) DCPA (saturated level of protamine was loaded), some protamine was released, and the number of planktonic bacteria in the supernatant decreased. Using medium containing 1% sucrose, the release of protamine was promoted from P (125) DCPA due to lowered pH. However, lowering of the pH decreased the antimicrobial activity of protamine. On the other hand, P (500) DCPA released protamine before the pH was lowered, and biofilm formation was inhibited. The loaded protamine expressed antimicrobial activity, both on the surface of the materials and in the surrounding environment. The interaction of loaded protamine with calcium phosphates could promote the application of protamine in the dental field.

RESUMEN

[Purpose] To determine the effects of a 12-week intervention consisting of marching in place and chair rising daily exercise on activities of daily living and functional mobility (ability to quickly rise from a chair and walk) in frail older adults. [Subjects and Methods] Thirty-one participants were divided into exercise (n=18, age=77.6 ± 7.2 years; 11 males, 7 females) and non-exercise (n=13, age=79.6 ± 7.7 years; 7 males, 6 females) groups. The exercise group performed 12 weeks of training, 7 days per week, and 20 minutes per session. The exercise program consisted of low to moderate intensity marching in place and chair rising movements. The speed of movements was gradually increased over time. The Barthel index, mean power during chair stand, and time to complete a 10-m walk were assessed before and after the intervention. [Results] Significant improvements were noted in the exercise group compared to the non-exercise group for the Barthel Index (11.6%), mean power (33%), and 10-M walk (14.6%) with a medium effect size, and relative mean power (power/body mass) (32.9%) with a large effect size. [Conclusion] The progressive marching in place and chair rising exercise intervention appears to be effective in improving activities of daily living and functional mobility among frail older adults.

RESUMEN

Crustacean proteins are food allergens that cause severe allergic reactions in patients with food allergies; therefore, the identification of crustaceans such as shrimp, crab, and lobster as ingredients in processed food products is mandatory in Japan. We previously developed and validated an ELISA method coupled with an extraction process using the surfactant sodium dodecyl sulfate and the reductant 2-mercaptoethanol (2-ME) to quantify crustacean protein. However, 2-ME was designated as poisonous in Japan in 2008. Therefore, in this study, we developed and evaluated an ELISA method for detecting and quantifying crustacean protein that uses sodium sulfite (Na2SO3) in place of 2-ME for extraction. The proposed ELISA method showed high sensitivity, with an LOQ of 0.66 µg protein/g food sample. Furthermore, the proposed method showed high specificity for the Decapoda order within the subphylum Crustacea, with recoveries ranging from 83.8 to 100.8% for model processed foods, as well as high reproducibility (intra- and interassay CVs of ≤8.2%) and high correlation with our previously validated ELISA method for processed foods (correlation coefficient of 0.996). The proposed ELISA method does not require the use of poisonous reagents, provides acceptable accuracy, and is useful for the routine monitoring of food products.

Asunto(s)

RESUMEN

The purpose of this study was to determine the effects of Tai Chi Chuan on static and dynamic balance, and functional fitness in older adults. Forty-nine volunteers were divided into an exercise group (EX: 9 men and 16 women, average age 72 ± 5 years) and control group (13 men and 11 women, average age 73 ± 6 years). The EX participated in a 12-week supervised exercise program (60 min/day, 2 days/week) that consisted of 10-min warm-up and stretching, 40-min Tai Chi Chuan exercise (long-form Yang style with 108 movements), and 10-min cool-down/relaxation exercises. The control group was asked to not change their physical activity habits. Static (sway velocity standing on firm or foam surfaces with eyes open or closed) and dynamic balance (limits of stability (LOS)), as well as functional fitness measures of body mass; upper- and lower-body strength; and flexibility, mobility, and aerobic fitness were taken before and after the intervention. After the 12-week Tai Chi Chuan exercise program, there were no improvements in any functional fitness or balance variable although components of LOS tended to increase (13.1%, p = 0.052). These results indicate that 12 weeks of Tai Chi Chuan exercise has no significant effect on balance and functional fitness parameters in older Japanese adults.

RESUMEN

Falls represent a major public health problem for older adults, and loss of balance (LOS) abilities is one of the primary causes of falls. Previous studies have shown that balance training is effective in improving physical function and decreasing risk of falls. However, little attention has been given specifically to balance training in older adults with very poor balance. The purpose of this study was to determine the effect of a 12-week customized balance exercise program on LOS for community-dwelling older women with poor balance ability. Twenty-four older women with poor balance (composite maximum excursion [MXEcomp] score of less than 70% based on Limits of Stability) were divided into an exercise group and control group. After 12 weeks of balance exercises, mean MXEcomp improved (p < .05) from 58.6% to 79.0% in the exercise group. EPEcomp (composite endpoint excursion), RTcomp (composite reaction time), SVcomp3 (composite sway velocity on thick foam with the eyes open), UG (up and go) also improved, but the functional reach and other static balance indexes did not change. These results indicated that balance training allows older adults with poor balance to improve dynamic balance ability and potentially reduce risk for falls.

Asunto(s)

RESUMEN

We developed and validated a novel lateral flow assay for the detection of crustacean protein in processed foods. This assay had high sensitivity; the visual detection limit for shrimp protein extract was 25µg/L, equivalent to 1µg/g protein in a food sample, and results could be obtained within 20min without sophisticated procedures or expensive equipment. Concordance between our assay and another validated quantitative enzyme-linked immunosorbent assay was 97% for commercially processed foods. This assay is rapid, simple, reliable, and highly correlated with validated enzyme-linked immunosorbent assays and is thus suitable for monitoring of food products, especially in food-processing facilities.

Asunto(s)

RESUMEN

AIM: Falling is the leading cause of injury-related deaths in older adults, and a loss of balance is often the precursor to a fall. However, little is known about the rate at which balance declines with age. The objective of the present study was to determine whether there is an age-associated decline in static (SB) and/or dynamic (DB) balance in community-dwelling older women. METHOD: SB and DB were determined in 971 older women. Intraclass correlation coefficients (ICC) were used to determine test-retest reliability. Sway velocity was used to measure SB standing on a platform and foam with eyes open and closed. DB was characterized by limits of stability (LOS) that measured end-point excursion (EXE) and maximum excursion (MXE) of the body's center of pressure. RESULTS: ICC for EXE and MXE for the LOS test were excellent (EPE = 0.96, MXE = 0.96). ICC for SB tests, except for the eyes open firm surface condition (ICC = 0.10), showed a high level of reproducibility (ICC = 0.88 and 0.90). Relationships existed between age and SB (r = 0.31, P < 0.001), and between age and DB (r = -0.46--0.48, P < 0.001). The rate of decline for both DB and SB was approximately 1% per year. Age was significantly associated with all balance measures. DB got significantly lower with advancing age until 80 years, and then plateaued. SB did not decline with age until 80 years, and then decreased significantly thereafter. CONCLUSION: Although large individual variation was found with balance ability, an age-related decline was found with both dynamic and static balance for Japanese older women.

Asunto(s)

RESUMEN

The purpose of this study was to compare the effects of Nordic walking with conventional walking and band-based resistance exercise on functional fitness, static balance and dynamic balance in older adults. Volunteers (n = 65) were divided into four groups: Nordic walking (NW), conventional walking (CW), resistance (RES), and control. Each group performed activity 50-70 min·day(-1) (warm-up 10-15 min, main exercise 30-40, and cool down 10-15 min), 3 days·week(-1) (NW and CW) or 2 day·week(-1) (RES) for 12 wks. Upper-body strength improved (p < 0. 05) in the RES (22.3%) and the NW (11.6%) groups compared to the CW and control groups. Cardio- respiratory fitness improved more in the NW (10.9%) and CW (10.6%) groups compared to the RES and control groups. Upper- and lower-body flexibility also improved in all exercise groups compared to the control group. There were no improvements in balance measures in any group. While all modes of exercise improved various components of fitness, Nordic walking provided the best well-rounded benefits by improving upper-body strength, cardiovascular endurance, and flexibility. Therefore, Nordic walking is recommended as an effective and efficient mode of concurrent exercise to improve overall functional fitness in older adults. Key PointsNordic walking, conventional walking, and resistance training are beneficial for older adults.Nordic walking and conventional walking both improve cardio-respiratory fitness while resistance training does not.Nordic walking provides additional benefits in upper-body muscular strength compared to conventional walking.Nordic walking is an effective and efficient mode of exercise to improve overall fitness in older adults.

RESUMEN

BACKGROUND: Although many Japanese older adults spend more than an hour each day walking for exercise, the intensity is often lower than the minimum level associated with various health benefits. The purpose of this study was to evaluate the efficacy of a lifestyle physical activity intervention on improving quantity and quality of daily physical activity (DPA) as well as cardiorespiratory endurance in community-dwelling older women. METHODS: 68 women (60-78 yr of age) were randomly assigned to either a lifestyle physical activity intervention group (LIFE) or control group. During the 12-wk intervention, feedback based on accelerometer DPA data (number of daily steps (STEPS) and time spent performing daily moderate intensity physical activity (MPA) was provided to each participant in LIFE every two weeks. Cardiorespiratory endurance was evaluated using the 12-Minute Walk Test (12-MW). RESULTS: Following the 12-wk intervention, significant group interactions were observed for STEPS, MPA, and cardiorespiratory endurance. LIFE increased STEPS by 16%, MPA by 53%, and the distance walked during the 12-MW by 10%. CONCLUSIONS: Promotion of DPA using accelerometers can significantly improve quantity and quality of daily physical activity as well as cardiorespiratory endurance in older women.

Asunto(s)

RESUMEN

OBJECTIVE: To determine the thresholds of lower extremity muscle strength below which performing activities of daily living (ADL) is impaired in older adults. DESIGN: Cross-sectional. SETTING: Community. SUBJECTS: Forty-nine older adults (81-89 years) were divided into an independent group (n = 25) who needed no assistance and a dependent group (n = 24) who needed assistance to perform ADL. INTERVENTIONS: Not applicable. MAIN MEASURES: Functional independence measures to determine level of disability and muscular strength of hip flexors, hip extensors, knee flexors, knee extensors and ankle dorsiflexors assessed by a hand-held dynamometer (HHD). Muscle groups were tested separately for each leg and values were averaged for the two legs. A ratio of maximal muscular strength to body weight was calculated by dividing the muscular strength (N) by body weight (kg). RESULTS: Muscular strength thresholds to perform ADL independently were 2.3 N/kg for hip flexors, 1.7 N/kg for hip extensors, 0.7 N/kg for knee flexors, 2.8 N/kg for knee extensors and 2.8 N/kg for ankle dorsiflexors. CONCLUSION: The thresholds of lower extremity muscle strength below which assistance is required to perform ADL in community-dwelling older adults were identified. Furthermore, results indicate that the muscular strength of hip extensors is more important in performing ADL than other muscles of the lower extremities.

Asunto(s)

RESUMEN

UNLABELLED: Various exercise modes are available to improve functional fitness (FF) in older adults. However, information on the comparative capability of different exercise modes to improve FF is insufficient. PURPOSE: To compare the effects of aerobic, resistance, flexibility, balance, and Tai Chi programs on FF in Japanese older adults. METHODS: FF was evaluated using a chair stand, arm curl, up and go, sit and reach, back scratch, functional reach, and 12-min walk. One hundred thirteen older adults (73 +/- 6 yr, 64 men, 49 women) volunteered for one of five exercise groups: aerobic (AER), resistance (RES), balance (BAL), flexibility (FLEX), and Tai Chi (T-CHI), or they were assigned to the wait-list control group (CON). Programs were performed for 12 wk, 2 d x wk(-1) (RES, BAL, FLEX, T-CHI) or 3 d x wk(-1) (AER), and 90 min x d(-1). RESULTS: Improvement in cardiorespiratory fitness was limited to AER (16%). Improvements in upper- and lower-body strength and balance/agility were outcomes of RES, BAL, and T-CHI. RES elicited the greatest upper-body strength improvement (31%), whereas BAL produced the greatest improvement in lower-body strength (40%). Improvements in balance/agility were similar across RES (10%), BAL (10%), and T-CHI (10%). Functional reach improved similarly in AER (13%), BAL (16%), and RES (15%). There were no improvements in flexibility. CONCLUSION: Results suggest that a single mode with crossover effects could address multiple components of fitness. Therefore, a well-rounded exercise program may only need to consist of two types of exercise to improve the components of functional fitness. One type should be aerobic exercise, and the second type could be chosen from RES, BAL, and T-CHI.

Asunto(s)

RESUMEN

The purpose of this study was to assess the efficacy of a home-based well-rounded exercise program (WREP) in older adults. Forty sedentary community-dwelling older adults were randomly assigned to an exercise group (n = 23; aged 62-80 yr, average: 69.2 ± 5.2; 12 men and 11 women) or a control group (n = 17; aged 63-85 yr, average: 70.1 ± 6.6; 5 men and 12 women). The exercise group performed a 12-wk WREP which included aerobic exercise (walking) on about 3 days·wk(-1) for 37 min·day(-1); elastic band-based resistance exercises for the major muscle groups on about 3 days·wk(-1) for 26 min; and flexibility exercises (stretching) on about 4 days·wk(-1) for 19 min·day(-1). General physical characteristics, functional strength (Arm Curl [AC], Chair Stand [CS]), dynamic balance and agility (Up & Go [UG]), flexibility (Back Scratch [BS], Sit & Reach [SR]), and endurance (12-min walk [12-MW]) were measured. Following the 12-wk home-based WREP, improvements were observed in AC, CS, UG, BS, SR and 12-MW for the exercise group but not for the control group. These results suggest that the home-based WREP can improve overall fitness in older adults. Key PointsWalking, elastic band exercise and stretching were prescribed as a Well-Rounded Exercise Program for older adults.By combining aerobic, resistance and flexibility exercises, a Well-Rounded Exercise Program was effective for improving endurance, functional strength, dynamic balance and agility, and flexibility.Community-based exercise classes motivated older adults to perform home-based exercises.

RESUMEN

BACKGROUND: Adequate levels of physical balance and muscular strength are necessary to live independently in old age. The effects of an exercise training program targeting the sensory and muscle systems on balance and strength in a group of older adults were determined in this study. METHODS: Static balance (one-leg balance with eyes closed), dynamic balance (limits of stability [endpoint excursion [EPE], maximum excursion [MXE]]), and strength (chair stand) were assessed before and after the intervention. Volunteers were divided randomly into a training group (TR, n = 15, 76 +/- 4 years) and a control group (CN, n = 14, 76 +/- 7 years). TR performed 12-week (2 days/week, 60 min/day) supervised training while standing on the floor (first 4 weeks) and progressing to standing on foam pads of different compliances. Exercises included movements that challenged the sensory and muscle systems. RESULTS: After 12 weeks of training, the TR demonstrated significant improvements in static balance (82%); EPE backward (72%), right (32%), and left (33%); MXE backward (74%), right (31%), and left (18%); and lower body muscle strength (20%) with no significant changes in CN. CONCLUSION: These results indicate that this training program is very effective in improving balance and lower body strength in older adults.

Asunto(s)