University Jaume I, LIFE Research Group, Castellon, Spain.
University Jaume I, LIFE Research Group, Castellon, Spain.
J Sci Med Sport. 2020 Oct;23(10):968-972. doi: 10.1016/j.jsams.2020.04.012. Epub 2020 Apr 18.
Firstly, to investigate the longitudinal associations between accelerometer-derived physical activity (PA) intensities and physical fitness (PF) at 24-month follow-up in adolescents. Secondly, to examine how substituting time spent in low or moderate PA intensities with vigorous PA at baseline was related to PF at 24-month follow-up.
Longitudinal observational study METHOD: The DADOS (Deporte, ADOlescencia y Salud) study is a 3-year longitudinal research project carried out between years 2015-2017. The analyses included 189 adolescents (91girls) aged 13.9±0.3 years at baseline. PA was assessed by a wrist-worn GENEActiv triaxial accelerometer and expressed as minutes/day of light, moderate and vigorous PA. Cardiorespiratory, musculoskeletal and motor fitness were assessed by field tests and a global fitness z-score was calculated as the mean of the z-scores values of each fitness test. Association between PA intensities and PF were determined using linear regression. Isotemporal analyses estimating the association of reallocating PA intensities with PF were performed.
Baseline vigorous PA was positively associated with cardiorespiratory fitness and global fitness score at follow-up in boys (β=0.234;p=0.002, β=0.340;p<0.001) and girls (β=0.184;p=0.043, β=0.213;p=0.004). In boys, baseline vigorous PA was also positively associated with musculoskeletal and motor fitness (β=0.139;p=0.035, β=0.195;p=0.021). The substitution of 10min/day of light PA or moderate PA with 10min/day of vigorous PA at baseline was positively associated with all PF components and global fitness score in boys (p<0.001), and with global fitness score girls (p<0.05).
These findings highlight the need of promoting vigorous PA due to its specific influence on adolescent's PF.
首先，研究青少年在 24 个月随访期间，基于加速度计的身体活动（PA）强度与身体机能（PF）之间的纵向关联。其次，研究在基线时用剧烈 PA 替代低强度或中等强度 PA 所花费的时间与 24 个月随访时 PF 的关系。
纵向观察性研究
DADOS（运动、青少年和健康）研究是一项在 2015-2017 年间开展的为期 3 年的纵向研究项目。分析纳入了 189 名青少年（91 名女孩），其在基线时年龄为 13.9±0.3 岁。PA 通过佩戴在手腕上的 GENEActiv 三轴加速度计进行评估，以分钟/天表示轻、中、高强度 PA。心肺功能、肌肉骨骼和运动机能通过现场测试进行评估，并计算出整体机能的 z 分数，即每个机能测试 z 分数的平均值。使用线性回归确定 PA 强度与 PF 之间的关系。进行等时分析，以估计重新分配 PA 强度与 PF 的关系。
在男孩中，基线时的剧烈 PA 与随访时的心肺功能和整体体能得分呈正相关（β=0.234;p=0.002，β=0.340;p<0.001），在女孩中，β=0.184;p=0.043，β=0.213;p=0.004）。在男孩中，基线时的剧烈 PA 还与肌肉骨骼和运动机能呈正相关（β=0.139;p=0.035，β=0.195;p=0.021）。在男孩中，基线时将 10 分钟/天的轻 PA 或中强度 PA 替换为 10 分钟/天的剧烈 PA，与所有 PF 成分和整体体能得分呈正相关（p<0.001），与女孩的整体体能得分呈正相关（p<0.05）。
这些发现强调了需要促进剧烈 PA，因为它对青少年 PF 有特定的影响。
