The effects of low-repetition and light-load power training on bone mineral density in postmenopausal women with sarcopenia: a pilot study.
The effects of low-repetition and light-load power training on bone mineral density in postmenopausal women with sarcopenia: a pilot study.
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DOI：
10.1186/s12877-017-0490-8
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发表时间：
2017-05-02
期刊：
影响因子：
4.1
通讯作者：
Sanada K
中科院分区：
文献类型：
--
作者：
Hamaguchi K;Kurihara T;Fujimoto M;Iemitsu M;Sato K;Hamaoka T;Sanada K
绝经后女性的骨矿物质密度 (BMD) 与年龄相关的降低通常会加速，并且在患有肌肉减少症的个体中可能更为明显。低重复次数的轻负荷力量训练会增加 BMD，从而显着减少有骨质疏松症风险的个体的骨质流失。本研究调查了低重复、轻负荷的力量训练对患有肌肉减少症的日本绝经后女性 BMD 的影响。训练组（n = 7）遵循渐进式力量训练方案，通过加重背心增加负荷，每周两次，持续 6 周。训练动作包括深蹲、前弓步、侧弓步、小腿抬高、脚趾抬高5种动作，每组动作8组，每组3次，每组之间休息15秒。对照组（n = 8）没有接受任何训练干预。我们测量了 BMD、肌肉力量和人体测量数据。训练组的骨盆 BMD 和膝伸肌力量的组内变化显着大于对照组（骨盆 BMD 和膝伸肌力量的 p 值分别为 0.029 和 0.030）。经过低重复、轻负荷的力量训练后，我们注意到骨盆 BMD (1.6%) 和膝伸肌力量 (15.5%) 有所改善。人体测量数据或前臂 BMD 没有观察到显着的组内或组间差异。六周的低重复、轻负荷力量训练改善了患有肌少症的绝经后女性的骨盆 BMD 和膝关节伸肌力量。由于该训练计划不需要高负荷运动，因此很容易作为日常运动实施，对于有骨质疏松症风险、害怕重负荷和/或可能导致疲劳的训练的久坐成年人来说，它可能是一种有效的运动形式。该试验于2016年10月31日在大学医院医疗信息网络注册（UMIN000024651）。
Age-related reduction in bone mineral density (BMD) is generally accelerated in women after menopause, and could be even more pronounced in individuals with sarcopenia. Light-load power training with a low number of repetitions would increase BMD, significantly reducing bone loss in individuals at risk of osteoporosis. This study investigated the effects of low-repetition, light-load power training on BMD in Japanese postmenopausal women with sarcopenia. The training group (n = 7) followed a progressive power training protocol that increased the load with a weighted vest, for two sessions per week, over the course of 6 weeks. The training exercise comprised five kinds of exercises (squats, front lunges, side lunges, calf raises, and toe raises), and each exercise contained eight sets of three repetitions with a 15-s rest between each set. The control group (n = 8) did not undergo any training intervention. We measured BMD, muscle strength, and anthropometric data. Within-group changes in pelvis BMD and knee extensor strength were significantly greater in the training group than the control group (p = 0.029 and 0.030 for pelvis BMD and knee extensor strength, respectively). After low-repetition, light-load power training, we noted improvements in pelvis BMD (1.6%) and knee extensor strength (15.5%). No significant within- or between-group differences were observed for anthropometric data or forearm BMD. Six weeks of low-repetition, light-load power training improved pelvis BMD and knee extensor strength in postmenopausal women with sarcopenia. Since this training program does not require high-load exercise and is therefore easily implementable as daily exercise, it could be an effective form of exercise for sedentary adults at risk for osteoporosis who are fearful of heavy loads and/or training that could cause fatigue. This trial was registered with the University Hospital Medical Information Network on 31 October 2016 (UMIN000024651).