In a cross-sectional study (UK Biobank) including 1218 pre- and 1316 postmenopausal healthy women, Stiles and colleagues¹ recently found that 1–2 min per day of high-intensity physical activity quantified from wrist-worn accelerometry-based monitors, equivalent to running [≥ 1000 milli-gravitational units (mg)] in premenopausal women and slow jogging (≥ 750 mg) in postmenopausal women, was positively associated with calcaneal quantitative ultrasound measures of bone health. I agree with the authors’ reasonable explanation that the lower threshold of intensity in postmenopausal women could result from their weaker bone strength; the skeleton normally responds to physical activity through resultant elastic deformation (strain).^2,3 Of note, however, mechanical...

中文翻译：

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身体活动和骨骼健康：了解与机械应变有关的刺激

在一项包括1218名绝经前和1316名绝经后健康女性的横断面研究（英国生物库）中，Stiles及其同事¹最近发现，每天¹到2分钟的高强度体育锻炼是通过基于腕戴式加速度计的监测器进行量化的，绝经前妇女跑步[≥1000毫重力单位（mg）]和绝经后妇女慢跑（≥750  mg）与跟骨骨骼健康的跟骨定量超声测量呈正相关。我同意作者的合理解释，即绝经后女性较低的强度阈值可能是由于她们的骨骼强度较弱所致。骨骼通常通过产生的弹性变形（应变）来响应身体活动。^{2 ，3}但值得注意的是，机械...