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      Dose-response relationship between daily steps counts and fat loss in obese children and adolescents

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          Abstract

          Objective To investigate whether there is a nonlinear relationship and threshold effect between the number of dailysteps counts and fat loss in obese children and adolescents.

          Methods Forty-eight obese children and adolescents were randomly recruited to undergo 4-week closed exercise training during July to August 2021. Actigraphy GT3X+ was used to monitor the dailysteps, and fat loss effect was evaluated by changes of body composition indicators before and after the intervention. Paired samples t test was used to compare the indicators before and after the intervention; the dose-response relationship between daily steps countsand fat loss was analyzed by linear regression and piecewise regression, and the nonlinear relationship was analyzed by restricted cubic spline (RCS).

          Results Body fat mass, percentage of body fat, lean body mass and skeletal muscle mass decreased (27.50±7.33) kg, (36.17±5.59)%, (47.55±6.48) kg, (26.14±3.84) kg, respectively compared with those before intervention [(31.97±7.82) kg, (39.06±5.12)%, (49.08±6.93) kg, (27.08±4.15) kg] ( t = 21.04, 13.32, 7.65, 8.35, P<0.05). There was a significantnonlinear dose-response relationship between daily steps counts and the change of these indicators ( P<0.05). After adjusting forage, sex and baseline BMI, each 1 000-step increase in daily walking number, BMI increased by 0.44 (95% CI = 0.03–0.84) kg and body fat percentage by 0.61% (95% CI = 0.17%–1.04%). After adjusting for age, sex, and baseline BMI, each 1 000 step increased in daily number of steps occurred when the daily number of steps ranged from 8 300 to 11 400, lean body weight increased by 0.58 (95 %CI = 0.11–1.04) kg, skeletal muscle mass increased by 0.29 (95% CI = 0.03–0.54) kg.

          Conclusion There is a non-linear dose-response relationship between daily steps and fat loss in obese children and adolescents, for optimal fat loss efficiency, daily steps to 8 300–11 400 appropriate.

          Abstract

          【摘要】 目的 探究肥胖儿童青少年每日不同步数与减脂效果间是否存在非线性关系和阈值效应, 以期为肥胖儿童青少年的运动减脂提供科学精准的理论依据。 方法 2021 年 7—8 月, 在深圳减肥达人训练营招募 48 名 10~17 岁肥胖儿童青少年进行 4 周封闭式运动训练, 使用 ActiGmph GT3X+ 监控每日步数, 通过干预前后身体成分指标的变化评价减脂效果。干预前后指标的比较使用配对样本 t 检验; 每日步数与减脂效果间的剂量-效应关系使用线性回归及分段回归分析, 非线性关系的分析使用限制性立方样条 (RCS) 分析。 结果 干预后体脂肪量 (27.50±7.33)kg、体脂百分比 (36.17±5.59)%、瘦体重 (47.55±6.48)kg、骨骼肌量 (26.14±3.84)kg 较干预前 [(31.97±7.82)kg, (39.06±5.12)%, (49.08±6.93)kg, (27.08±4.15)kg] 均下降 ( t 值分别为 21.04, 13.32, 7.65, 8.35, P 值均<0.05), 每日步数与以上指标的变化量间存在非线性剂量-效应关系 ( P 值均<0.05); 分段回归结果显示, 校正年龄、性别和基线BMI后, 每日步数每增加 1 000 步, 体脂肪量增加 0.44(95% CI =0.03~0.84)kg、体脂百分比增加 0.61% (95% CI = 0.17%~1.04%)。在校正了年龄、性别、基线 BMI 后, 当每日步数 8 300~11 400 时, 每日步数每增加 1 000 步, 瘦体重增加 0.58(95% CI = 0.11~1.04)kg、骨骼肌量增加 0.29(95% CI = 0.03~0.54)kg。 结论 肥胖儿童青少年每日步数与减脂效果间存在非线性的剂量-效应关系, 为了达到最佳减脂效率, 每日步数以 8 300~1 1400 步为宜。

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          Author and article information

          Journal
          CJSH
          Chinese Journal of School Health
          Chinese Journal of School Health (China )
          1000-9817
          01 September 2022
          01 September 2022
          : 43
          : 9
          : 1329-1332
          Affiliations
          [1] 1Graduate Department of Guangzhou Sport University, Guangzhou (510500), China
          Author notes
          *Corresponding author: ZHU Lin, E-mail: 11251@ 123456gzsport.edu.cn
          Article
          j.cnki.1000-9817.2022.09.012
          10.16835/j.cnki.1000-9817.2022.09.012
          31a7bcf3-05a8-4426-8dab-d8b58ceb8461
          © 2022 Chinese Journal of School Health

          This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 Unported License (CC BY-NC 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. See https://creativecommons.org/licenses/by-nc/4.0/.

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          Self URI (journal-page): http://www.cjsh.org.cn
          Categories
          Journal Article

          Ophthalmology & Optometry,Pediatrics,Nutrition & Dietetics,Clinical Psychology & Psychiatry,Public health
          Intervention studies,Child,Adolescent,Adipose tissue,Walking,Obesity

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