講演情報
[学校保健体育-B-24]Effects of Physical Activity, Proportion of Snack and Its Protein Calories on Changes in Overweight and Obese Adolescents' Body Composition（介,測）A Multi-stage Longitudinal Study Differentiating Home and School Environments
*Pan Xiang1,2、Suzuki Koya2、Zhang Yanfeng1 (1. China Institute of Sport Science、2. Graduate School of Health and Sports Science, Juntendo University)
Background: With rising incomes in developing countries, the required necessary physical activity declines and the availability of snacks increases, further fuelling obesity in adolescents.
Purpose: Based on a two-stage observational study with a longitudinal period differentiating home and school environments. The study provides further insights into how multi-stage changes in moderate to high intensity physical activity (MVPA), snacking habits (proportion of snack calorie, PSC; snack protein calorie proportion, PSCP) and their variations affect the body composition of overweight and obese adolescents.
Methods: We conducted a multistage observational study with 74 adolescents (13-15 years old). Data on body composition (Inbody 3.0), PSC, PSCP (24-hour dietary review questionnaire) and MVPA (Actigraph GT3X+) were collected at three time points (mid-semester (T0), end of semester (T1) and end of winter break (T2). Paired samples t-tests were used to analyse multi-stage changes, and multiple linear regression and Granger causality tests analysed correlations and causality of body composition.
Results: The results showed that during the semester phase, body fat percentage (BFP) and PSCP decreased, fat free mass (FFM) and PSC increased and MVPA did not change significantly. During the holiday phase, BFP increased, FFM continued to increase by less than the semester phase, PSC rebounded slightly, PSCP decreased significantly, and MVPA remained unchanged. During the semester phase, increases in ΔMVPA and ΔPSCP and decreases in ΔPSC were associated with decreases in ΔBFP (Δ=post timepoint value -pre timepoint value). During the holiday phase, decreases in ΔPSCP, MVPA (T1), and PSCP (T1), and increases in ΔPSC were associated with increases in ΔBFP. Only MVPA having a positive predictive effect causally on FFM.
Conclusion: Snacking habits have a significant impact on body composition changes in adolescents, and reducing snack intake and choosing high-protein snacks are critical to controlling obesity in adolescents, especially during the holiday period. Strategies to increase MVPA should also be implemented to increase FFM briefly indirectly control obesity.
Purpose: Based on a two-stage observational study with a longitudinal period differentiating home and school environments. The study provides further insights into how multi-stage changes in moderate to high intensity physical activity (MVPA), snacking habits (proportion of snack calorie, PSC; snack protein calorie proportion, PSCP) and their variations affect the body composition of overweight and obese adolescents.
Methods: We conducted a multistage observational study with 74 adolescents (13-15 years old). Data on body composition (Inbody 3.0), PSC, PSCP (24-hour dietary review questionnaire) and MVPA (Actigraph GT3X+) were collected at three time points (mid-semester (T0), end of semester (T1) and end of winter break (T2). Paired samples t-tests were used to analyse multi-stage changes, and multiple linear regression and Granger causality tests analysed correlations and causality of body composition.
Results: The results showed that during the semester phase, body fat percentage (BFP) and PSCP decreased, fat free mass (FFM) and PSC increased and MVPA did not change significantly. During the holiday phase, BFP increased, FFM continued to increase by less than the semester phase, PSC rebounded slightly, PSCP decreased significantly, and MVPA remained unchanged. During the semester phase, increases in ΔMVPA and ΔPSCP and decreases in ΔPSC were associated with decreases in ΔBFP (Δ=post timepoint value -pre timepoint value). During the holiday phase, decreases in ΔPSCP, MVPA (T1), and PSCP (T1), and increases in ΔPSC were associated with increases in ΔBFP. Only MVPA having a positive predictive effect causally on FFM.
Conclusion: Snacking habits have a significant impact on body composition changes in adolescents, and reducing snack intake and choosing high-protein snacks are critical to controlling obesity in adolescents, especially during the holiday period. Strategies to increase MVPA should also be implemented to increase FFM briefly indirectly control obesity.
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