Association between resting metabolic rate and objectively measured physical activity in South African. adolescents: the PAHL study

作者：Wushe S N^*; Moss S J; Monyeki M A

来源：Medicina dello Sport, 2014, 67(4): 603-615.

• Motor activity
• Basal metabolism
• Obesity
• Adolescents

Aim. Behaviour established in adolescence is often carried into adulthood. This study aims to identify habitual physical activity (PA) patterns and energy expenditure in 15-16-year old adolescents as well as determine the association between resting metabolic rate (RMR) and objectively determined PA in 15-16-year old adolescents.
Methods. Adolescents (29 boys, 32 girls) from the on-going five year Physical Activity and Health Longitudinal Study (PAHLS; 2010-2014) were included in the study. RMR was measured by indirect calorimetry following an overnight fast. PA was assessed over seven days using the Actiheart(R) (Cambridge, UK). Data analysis consisted of independent t-tests, Mann-Whitney U-test and multiple regression analysis using SPSS version 20.
Results. Girls spent significantly (P<0.05) more minutes/day in moderate-to-vigorous PA, than boys. Boys had significantly higher (P<0.05) RMR and total energy expenditure than girls. However, girls attained significantly higher (P=0.022) activity energy expenditure values than boys. After adjustment for confounding factors in multiple regression, it is evident that moderate and vigorous PA had a large positive effect on RMR, standardised beta=0.395 and 4.070 respectively. Additionally, regression analysis between RMR and moderate PA yielded an r(2)=0.46 (P<0.05).
Conclusion. The present results show a significant direct relationship between RMR and PA. Standardised beta=0.395 indicates that as moderate PA increases by one standard deviation, RMR increases by 0.395 standard deviations. An r(2) of 0.46 suggests that moderate PA accounts for almost 50% of the variation of RMR in adolescents.

• 出版日期2014-12
• 单位西北大学