青少年的久坐模式、身体活动及与健康相关的身体素质：一项横断面研究
Sedentary patterns, physical activity and health-related physical fitness in youth: a cross-sectional study.
作者信息
Júdice Pedro B, Silva Analiza M, Berria Juliane, Petroski Edio L, Ekelund Ulf, Sardinha Luís B
机构信息
Exercise and Health Laboratory, CIPER, Faculdade de Motricidade Humana, Universidade de Lisboa, Estrada da Costa, Cruz-Quebrada, Lisbon, 1499-002, Portugal.
Graduate in Physical Education Program, Kinanthropometry Center and Human Performance, Federal University of Santa Catarina, Santa Catarina, Brazil.
出版信息
Int J Behav Nutr Phys Act. 2017 Mar 4;14(1):25. doi: 10.1186/s12966-017-0481-3.
BACKGROUND
Strong evidence indicates that moderate-vigorous physical activity (MVPA) is positively associated with fitness in youth, independent of total sedentary-time. Sedentary-time appears negatively associated with fitness only when it replaces MVPA. However, whether different sedentary-patterns affect health-related fitness is unknown.
METHODS
The associations between MVPA and sedentary-patterns with physical fitness were examined in 2698 youths (1262 boys) aged 13.4 ± 2.28 years. Sedentary-time (counts · minute < 100) and PA were objectively measured by accelerometry. Each break (≥100 counts · min < 2295) in sedentary-time and the frequency of daily bouts in non-prolonged (<30 min) and prolonged (≥30 min) sedentary-time were determined. The FITNESSGRAM® test battery was used to assess fitness. A standardized fitness composite-score (z-score) was calculated by summing the individual z-scores of the five tests adjusted to age and sex.
RESULTS
Positive associations between MVPA and fitness were observed in both boys (β = 0.013, 95% CI: 0.005; 0.021) and girls (β = 0.014, 95% CI: 0.006; 0.022), independent of sedentary-patterns. Modest associations were found for the breaks in sedentary-time with fitness (β = 0.026, 95% CI: 0.009; 0.042), independent of total sedentary-time and MVPA in boys. In girls, non-prolonged sedentary bouts were positively associated with fitness (β = 0.014, 95% CI: 0.003; 0.024), independent of total sedentary-time and MVPA.
CONCLUSIONS
These results reinforce that, independent of the time and patterns of sedentary behavior, MVPA is consistently associated with fitness in youth. Modest and inconsistent associations were found for sedentary behaviors. Breaking-up sedentary-time in boys and non-prolonged sedentary bouts in girls were positively associated with fitness, independent of total sedentary-time and MVPA. In order to enhance youth's fitness, public health recommendations should primarily target MVPA, still, suggestion to reduce and break-up sedentary-time may also be considered.
背景
有力证据表明，中等到剧烈的身体活动（MVPA）与青少年的健康状况呈正相关，且与总久坐时间无关。只有当久坐时间取代MVPA时，久坐时间才似乎与健康状况呈负相关。然而，不同的久坐模式是否会影响与健康相关的体能尚不清楚。
方法
对2698名年龄在13.4±2.28岁的青少年（1262名男孩）进行了MVPA和久坐模式与体能之间的关联研究。通过加速度计客观测量久坐时间（计数·分钟<100）和身体活动。确定了久坐时间中的每次中断（≥100计数·分钟<2295）以及非长时间（<30分钟）和长时间（≥30分钟）久坐时间的每日发作频率。使用FITNESSGRAM®测试组合来评估体能。通过将根据年龄和性别调整后的五项测试的个体z分数相加，计算出标准化的体能综合分数（z分数）。
结果
在男孩（β=0.013，95%置信区间：0.005；0.021）和女孩（β=0.014，95%置信区间：0.006；0.022）中均观察到MVPA与体能之间的正相关，且与久坐模式无关。在男孩中，发现久坐时间的中断与体能存在适度关联（β=0.026，95%置信区间：0.009；0.042），且与总久坐时间和MVPA无关。在女孩中，非长时间的久坐发作与体能呈正相关（β=0.014，95%置信区间：0.003；0.024），且与总久坐时间和MVPA无关。
结论
这些结果强化了这样的观点，即与久坐行为的时间和模式无关，MVPA始终与青少年的体能相关。久坐行为存在适度且不一致的关联。男孩中久坐时间的中断和女孩中非长时间的久坐发作与体能呈正相关，且与总久坐时间和MVPA无关。为了提高青少年的体能，公共卫生建议应主要针对MVPA，不过，也可考虑减少和打破久坐时间的建议。
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