High impact activity is related to lean but not fat mass: findings from a population-based study in adolescents
High impact activity is related to lean but not fat mass: findings from a population-based study in adolescents
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DOI：
10.1093/ije/dys073
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发表时间：
2012-08-01
影响因子：
7.7
通讯作者：
Tobias, Jon H.
中科院分区：
文献类型：
--
作者：
Deere, Kevin;Sayers, Adrian;Tobias, Jon H.
背景 根据能量消耗校准身体活动的客观测量在研究与肌肉骨骼表型的关系中可能作用有限。我们希望评估使用根据冲击载荷校准的加速度计的替代方法。方法在雅芳父母和儿童纵向研究 (ALSPAC) 的 17 岁儿童中，732 名在进行日常活动时佩戴 Newtest 加速度计，平均时间为 5.8 天。根据 22 名青少年在分级活动中确定的阈值，产出被分为轻度、中度、高度和极高影响。在随后的回归分析中，活动数据和脂肪量通过对数转换进行标准化。结果与高冲击活动相关的计数数量与轻度冲击活动相关的计数数量相似，男孩比女孩高出 33%。高冲击力活动与瘦体重的相关性更强[轻度：0.033（95% CI -0.023 至 0.089），中度：0.035（95% CI -0.010 至 0.080）和高：0.044（95% CI 0.010 至 0.078）]（β = 每次活动加倍结果的 SD 变化，身高调整，男孩和女孩合并）。相反，较低的冲击活动与脂肪量的相关性更强[轻：-0.069（95% CI -0.127至-0.011），中：-0.060（95% CI -0.107至-0.014）和高：-0.033（95% CI -0.069至-0.003）]。在包括其他活动类型和脂肪/瘦体重的更全面调整的模型中，瘦体重仅与高活动相关（男孩和女孩的总和），而脂肪质量仅与中等活动相关（仅女孩）。结论使用根据冲击载荷校准的加速度计显示，高冲击活动与瘦体重相关，但与脂肪质量无关。
Background Objective measures of physical activity calibrated against energy expenditure may have limited utility in studying relationships with musculoskeletal phenotypes. We wished to assess an alternative approach using an accelerometer calibrated according to impact loading.Methods Of the 17-year olds from the Avon Longitudinal Study of Parents and Children (ALSPAC), 732 wore Newtest accelerometers while performing day-to-day activities for a mean of 5.8 days. Outputs were categorized as light, moderate, high and very high impact, based on the thresholds identified in 22 adolescents during graded activities. In subsequent regression analyses, activity data and fat mass were normalized by log transformation.Results The number of counts relating to high impact activity was similar to 2% that of light impact activity, and 33% greater in boys when compared with girls. High impact activity was more strongly related to lean mass [light: 0.033 (95% CI -0.023 to 0.089), moderate: 0.035 (95% CI -0.010 to 0.080) and high: 0.044 (95% CI 0.010 to 0.078)] (beta = SD change in outcome per doubling in activity, height adjusted, boys and girls combined). In contrast, lower impact activity was more strongly related to fat mass [light: -0.069 (95% CI -0.127 to -0.011), moderate: -0.060 (95% CI -0.107 to -0.014) and high: -0.033 (95% CI -0.069 to 0.003)]. In a more fully adjusted model including other activity types and fat/lean mass, lean mass was related to only high activity (boys and girls combined), whereas fat mass was related to only moderate activity (girls only).Conclusions Using an accelerometer calibrated according to impact loading revealed that high impact activity is related to lean but not fat mass.