Association of light-intensity physical activity, sedentary time and body composition in adolescents
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摘要:
目的 探讨低强度身体活动(LPA)和久坐行为(SB)与体成分间的关联, 为改善青少年体质健康提供参考。 方法 于2020年8月至2021年1月, 收集佛山市某中学高一年级694名学生基本信息, 采用三轴加速度计和生物电阻抗测试仪测量学生24 h活动行为和体成分。采用双成分回归和等时替代模型, 探讨LPA和SB与体成分间的关系。 结果 LPA与较低的脂肪相对优势(FRD)有关(男生周末: FRD=-21.44%;女生一周: FRD=-17.83%, 学习日FRD=-18.27%, P值均 < 0.05), LPA与较高的肌肉相对优势(MRD)和骨骼相对优势(BRD)有关(男生周末: MRD=12.78%, BRD=12.87%;女生一周MRD=11.64%, BRD=9.01%;女生学习日MRD=12.02%, BRD=9.23%)(P值均 < 0.05)。用10 min LPA替代SB可减少脂肪比例[男生: 一周-0.15(-0.26~-0.04), 学习日-0.12(-0.22~-0.02);女生: 一周-0.18(-0.27~-0.08), 学习日-0.16(-0.25~-0.07)]和增加肌肉比例[男生: 一周0.14(0.03~0.24), 学习日0.11(0.02~0.21);女生: 一周0.17(0.07~0.26), 学习日0.15(0.07~0.24)]。 结论 用LPA中断连续SB可作为青少年身体活动促进体质健康的干预措施。学校应鼓励学生在课间与课外经常进行LPA, 同时避免长时间SB。 Abstract:Objective To explore the association between light-intensity physical activity (LPA) and sedentary behavior (SB) with body composition, so as to provide data references for improving adolescent physical health. Methods From August 2020 to January 2021, general information of 694 students in grade one of a high school in Foshan City was collected, and the 24-hour activity behavior and body composition of the students were measured objectively by triaxial accelerometer and bioelectrical impedance tester.Dual-component multivariate regression and dual-compositional isotemporal substitution model were used to explore the relationship between LPA and SB and body composition. Results LPA was associated with lower fat relative dominance (FRD)(male weekends FRD=-21.44%, female weekly FRD=-17.83%, weekdays FRD=-18.27%, P < 0.05), and LPA was also associated with higher muscle relative dominance (MRD) and bone relative dominance (BRD)(male weekends MRD=12.78%, BRD=12.87%;female weekly MRD=11.64%, BRD=9.01%;female weekdays MRD=12.02%, BRD=9.23%, P < 0.05).Replacing sedentary behavior (SB) with 10 minutes of LPA could reduce fat proportion[male: weekly-0.15(-0.26-0.04), weekdays-0.12(-0.22-0.02);female: weekly-0.18(-0.27-0.08), weekdays-0.16(-0.25-0.07)) and increase muscle proportion (male: weekly 0.14(0.03-0.24), weekdays 0.11(0.02-0.21);female: weekly 0.17(0.07-0.26), weekdays 0.15(0.07-0.24)]. Conclusion Interrupting continuous SB with LPA can serve as an intervention measure to promote physical health and fitness in adolescents.School should encourage students to engage in frequent LPA during breaks and after-school activities, while avoiding prolonged SB. -
Key words:
- Motor activity /
- Sedentary lifestyle /
- Body composition /
- Regression analysis /
- Adolescent
1) 利益冲突声明 所有作者声明无利益冲突。2) 叶荣荣与黄宝莹为共同第一作者。 -
表 1 不同性别学生的LPA、SB时间和体成分几何均数
Table 1. Geometric mean of LPA, SB time and body composition among students of different genders
性别 人数 LPA/(min·d-1) SB/(min·d-1) 体成分/kg 一周 学习日 周末 一周 学习日 周末 FM LM BMC 男 309 232.80 241.20 206.40 662.40 647.40 712.20 10.13 47.17 2.94 女 385 231.60 236.40 215.40 708.60 706.20 720.00 14.27 34.43 2.32 总计 694 232.80 239.40 211.80 689.40 681.00 717.00 12.43 40.10 2.60 
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表 2 不同性别学生LPA、SB和体成分双成分CoDA回归模型结果
Table 2. Results of dual-component CoDA regression model of LPA, SB and body composition among students of different genders
性别 指标 时间 FM LM BMC β值 标准误 P值 FRD/% β值 标准误 P值 MRD/% β值 标准误 P值 BRD/% 男 LPA 一周 -0.26 0.17 0.13 -16.63 0.12 0.09 0.20 8.58 0.14 0.08 0.08 10.46 (n=309) 学习日 -0.22 0.16 0.17 -14.30 0.10 0.09 0.24 7.31 0.12 0.08 0.12 8.73 周末 -0.35 0.16 0.03 -21.44 0.17 0.08 0.04 12.78 0.17 0.07 0.02 12.87 SB 一周 0.53 0.30 0.07 44.36 -0.31 0.16 0.05 -19.57 -0.22 0.14 0.12 -13.88 学习日 0.42 0.27 0.13 33.76 -0.24 0.15 0.01 -15.53 -0.18 0.13 0.17 -11.50 周末 0.30 0.19 0.11 22.79 -0.17 0.10 0.09 -11.27 -0.12 0.09 0.16 -8.21 女 LPA 一周 -0.28 0.09 < 0.01 -17.83 0.16 0.05 < 0.01 11.64 0.12 0.05 0.01 9.01 (n=385) 学习日 -0.29 0.09 < 0.01 -18.27 0.16 0.05 < 0.01 12.02 0.13 0.04 0.01 9.23 周末 -0.15 0.08 0.06 -9.97 0.08 0.04 0.06 5.72 0.07 0.04 0.08 5.06 SB 一周 0.16 0.18 0.38 11.47 -0.08 0.09 0.37 -5.55 -0.07 0.09 0.41 -5.01 学习日 0.03 0.17 0.85 2.31 -0.02 0.09 0.83 -1.32 -0.01 0.09 0.88 -0.94 周末 0.19 0.11 0.08 13.77 -0.09 0.06 0.11 -5.96 -0.10 0.05 0.07 -6.53
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表 3 不同性别学生一周LPA和SB等时替代10 min引起体成分百分比的变化
Table 3. Changes in percentages of body composition caused by a 10-minute redistribution of LPA and SB during one week among students of different genders
性别 等时替代 FM/% LM/% BMC/% 男生 +LPA-SB -0.15(-0.26~-0.04)* 0.14(0.03~0.24)* 0.01(0.00~0.01) (n=309) +SB-LPA 0.15(0.03~0.27)* -0.14(-0.25~-0.03)* -0.01(-0.01~0.00) 女生 +LPA-SB -0.18(-0.27~-0.08)* 0.17(0.07~0.26)* 0.01(0.00~0.02) (n=385) +SB-LP 0.18(0.08~0.29)* -0.17(-0.27~-0.08)* -0.01(-0.02~0.00) 注： *P < 0.05；+为增加10 min，-为减少10 min；()内数字为95%CI。
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表 4 不同性别学生周末与学习日LPA和SB等时替代10 min引起体成分百分比的变化
Table 4. Changes in percentages of body composition caused by a 10-minute redistribution of LPA and SB between weekends and weekdays among students of different genders
性别 等时替代 学习日 周末 FM LM BMC FM LM BMC 男生 +LPA-SB -0.12(-0.22~-0.02)* 0.11(0.02~0.21)* 0.01(0.00~0.01) -0.16(-0.27~-0.04)* 0.15(0.03~0.26)* 0.01(0.00~0.01) (n=309) +SB-LPA 0.12(0.02~0.23)* -0.11(-0.21~-0.02)* -0.01(-0.01~0.00) 0.16(0.04~0.29)* -0.15(-0.28~-0.03)* 0.01(-0.01~0.00) 女生 +LPA-SB -0.16(-0.25~-0.07)* 0.15(0.07~0.24)* 0.01(0.00~0.01) -0.10(-020~0.00) 0.10(0.00~0.19) 0.01(0.00~0.01) (n=385) +SB-LPA 0.16(0.07~0.26)* -0.16(-0.24~-0.07)* -0.01(-0.01~0.00) 0.11(0.00~0.21) -0.10(-0.20~0.00) -0.01(-0.01~0.00) 注： *P < 0.05；+为增加10 min，-为减少10 min；()内数字为95%CI。
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