RESUMEN
BACKGROUND: The aim of this study was to examine the intrapersonal, social, and physical environmental factors associated with physical activity (PA) practice in Thai adolescents. METHODS: A total of 5536 adolescents aged 14-17 years participated in the survey. Confirmatory factor analyses and structural equation modeling were conducted to determine associations between intrapersonal, social, and physical environmental factors with PA. RESULTS: The mean age of participants was 15.50 (1.12) years. Community environment had an overall effect on PA (ß = 0.08). Perceived family support had direct (ß = -0.14) and indirect (ß = 0.17) effects on PA through perceived barriers (ß = 0.14). Perceived barriers were directly related to PA (ß = -0.23) and indirectly (ß = -0.16) related to PA through self-efficacy (ß = -0.14) and through perceived benefits and self-efficacy (ß = -0.02). Perceived usefulness was indirectly related to PA through self-efficacy (ß = 0.07). Self-efficacy was directly related to PA (ß = 0.43). Girls were more likely to report more perceived barriers (ßtotal = 0.13). The model explained 45% of the variance in PA. CONCLUSION: Self-efficacy and perceived barriers are important intrapersonal factors, whereas perceived family support is an important interpersonal factor for PA among Thai adolescents.
Asunto(s)
Ejercicio Físico , Autoeficacia , Adolescente , Cognición , Ejercicio Físico/psicología , Femenino , Humanos , Medio Social , Apoyo Social , TailandiaRESUMEN
To characterize physiological stress response against simulated short-distance sprints among world-class paddlers. Thirteen dragon boat gold medalists performed 200-m and 500-m simulated race trials on a kayak ergometer in a randomized, counter-balanced, crossover fashion. During the 200-m and 500-m sprints, oxygen consumption (VO2) increased from 8.7 to 31.2 ml/kg/min and from 8.0 to 32.7 ml/kg/min within 60 s, respectively. A plateau of 35 ml/kg/min below maximal VO2(VO2max) (39.7 ± 6.3 ml/kg/min) was reached at 75 s during the 500-m sprint. Respiratory exchange ratio dropped from 1.21 ± 0.16 to 1.07 ± 0.12 and 1.28 ± 0.13 to 1.06 ± 0.16 at 45 s, and resurged to 1.17 and 1.28 at the end of 200-m and 500-m sprints with lactate concentration reached 13 ± 2 and 15 ± 2 mM. Aerobic energy contribution to paddling power increases from ~10% for the first 15 s to ~80% for the last 15 s during the 500-m trial. Postexercise plasma thiobarbituric acid reactive substances increased by 376% and 543% above baseline after 200-m and 500-m trials (P < 0.001, between trials), respectively, followed by quick returns to baseline in 30 min (P < 0.001). Increased plasma creatine kinase (+48%) was observed only after the 500-m trial (P < 0.001, between trials), not 200-m trial. Our data suggest that muscle damage occurred only when maximal sprinting exceeding 2 min, highlighting an importance of volume than intensity on exercise-induced muscle damage.
Asunto(s)
Consumo de Oxígeno , Navíos , Estrés Fisiológico , Humanos , Ácido Láctico , DeportesRESUMEN
BACKGROUND: Physical activity (PA) is recognized as one of the core modifiable risk factors of noncommunicable diseases. However, little is known about PA in the Thai population, particularly in children. The report card (RC) project provided Thailand with an opportunity to assess PA behaviors in children. This paper summarizes the methodology, grading process, and the final grades of the Thai RC. METHODS: A school-based survey was conducted to collect data from a nationally representative sample of children aged 6 to 17 years. Survey results provided the primary source for the RC. Nine indicators were graded using the Global Matrix 2.0 framework. Grading was undertaken by a national committee comprising experts from key stakeholders. RESULTS: Grades ranged from F to B. Overall PA and Sedentary Behaviors both received the grade D-. Organized Sport Participation scored a C. Active Play scored the grade F. Active Transport and support from Family and Peers were both graded B. School, Community, and Government indicators were scored C. CONCLUSIONS: In Thai children, participation in PA and active play is very low; conversely, sedentary behaviors are high. These first data on patterns of activity for the Thailand RC will serve to guide national actions and advocacy aimed at increasing PA in children.
Asunto(s)
Países en Desarrollo , Ejercicio Físico , Promoción de la Salud , Informe de Investigación , Adolescente , Niño , Planificación Ambiental , Femenino , Encuestas Epidemiológicas , Humanos , Masculino , Actividad Motora , Juego e Implementos de Juego , Conducta Sedentaria , TailandiaRESUMEN
OBJECTIVES: To evaluate the efficacy of a Social Cognitive Theory-based Internet intervention designed to promote and maintain leisure-time physical activity in university-aged female students in Thailand. METHODS: The 3-month intervention was delivered through a website and e-mails with a follow-up evaluation 3 months after the end of the intervention. Female students (N = 220) were allocated to 4 parallel groups. RESULTS: Significant increases in steps/ day, weekly leisure-time activity score, self-efficacy, outcome expectations, and self-regulation, and reduced resting heart rate were observed at the end of the intervention. With the exception of resting heart rate, the intervention effects on these variables also remained at the follow-up. CONCLUSIONS: The Internet intervention program was effective in promoting and maintaining leisure-time physical activity in university-aged female students.