Center for Health and Performance, Department of Food and Nutrition and Sport Science, Faculty of Education, University of Gothenburg, Box 300, 405 30, Gothenburg, Sweden.
Department of Physical Activity and Health, Swedish School of Sport and Health Sciences, Stockholm, Sweden.
BMC Public Health. 2023 Nov 24;23(1):2322. doi: 10.1186/s12889-023-17281-4.
Observational studies investigating the association between accelerometer-measured physical activity and health all use absolute measures of physical activity intensity. However, intervention studies suggest that the physical activity intensity required to improve health is relative to individual fitness. The aim of this study was to investigate the associations between accelerometer-measured absolute and relative physical activity intensity and cardiometabolic health, and what implications these associations may have on the interpretation of health-associated physical activity.
A sample of the cross-sectional Swedish CArdioPulmonary bioImage Study (SCAPIS) consisting of 4,234 men and women aged 55-64 years was studied. Physical activity intensity was measured by accelerometry and expressed as absolute (e.g., metabolic equivalents of task) or relative (percentage of maximal oxygen consumption). Fitness was estimated by the submaximal Ekblom-Bak test. A composite ('metabolic syndrome') score combined measures of waist circumference, systolic blood pressure, high-density lipoprotein, triglycerides, and glycated hemoglobin. Associations of absolute and relative physical activity intensity with the health indicators (i.e., fitness and metabolic syndrome score) were studied by partial least squares regression. Analyses were stratified by fitness level.
Both absolute and relative physical activity intensity associated with the health indicators. However, the strongest associations for absolute intensity varied depending on fitness levels, whereas the associations for relative intensity were more synchronized across fitness groups. The dose-response relationship between moderate-to-vigorous intensity and the health indicators was stronger for relative than for absolute intensity. The absolute and relative moderate-to-vigorous intensity cut-offs intersected at the 5th fitness percentile, indicating that the absolute intensity cut-off is too low for 95% of individuals in this sample. While 99% of individuals fulfilled the general physical activity recommendations based on absolute intensity measures, only 21% fulfilled the recommendations based on relative intensity measures. In relation to a "sufficient" fitness level, 9% fulfilled the recommendations.
Accelerometer-measured relative physical activity intensity represents the intensity related to health benefits regardless of fitness level. Traditional absolute moderate intensity accelerometer cut-offs are too low for most individuals and should be adapted to the fitness level in the sample studied. Absolute and relative physical activity intensity cannot be used interchangeably.
所有研究计步器测量的身体活动与健康之间关系的观察性研究都使用身体活动强度的绝对测量值。然而，干预研究表明，改善健康所需的身体活动强度与个体健康状况有关。本研究旨在探讨计步器测量的绝对和相对身体活动强度与心血管代谢健康之间的关系，以及这些关系对健康相关身体活动的解释可能产生的影响。
本研究使用了瑞典心肺生物影像研究（SCAPIS）的横断面样本，其中包括 4234 名年龄在 55-64 岁的男性和女性。身体活动强度通过加速度计测量，并表示为绝对（例如，任务代谢当量）或相对（最大耗氧量的百分比）。通过埃克布洛姆-贝克亚极限测试估计体能。一个综合的（“代谢综合征”）评分结合了腰围、收缩压、高密度脂蛋白、甘油三酯和糖化血红蛋白的测量值。通过偏最小二乘回归研究了绝对和相对身体活动强度与健康指标（即体能和代谢综合征评分）之间的关系。分析按体能水平进行分层。
绝对和相对身体活动强度均与健康指标相关。然而，绝对强度的最强关联取决于体能水平，而相对强度的关联在不同体能组之间更为同步。与健康指标相关的中等到剧烈强度的剂量-反应关系，相对强度比绝对强度更强。绝对和相对的中等到剧烈强度的截止值在第 5 个体能百分位数相交，这表明对于该样本中的 95%的个体，绝对强度的截止值太低。虽然 99%的个体满足基于绝对强度测量的一般身体活动建议，但只有 21%的个体满足基于相对强度测量的建议。与“足够”的体能水平相比，只有 9%的个体满足建议。
计步器测量的相对身体活动强度代表与健康益处相关的强度，而与体能水平无关。传统的绝对中等强度计步器截止值对于大多数个体来说太低，应该根据研究样本中的体能水平进行调整。绝对和相对身体活动强度不能互换使用。
