Hu M, Finni T, Zou L, Perhonen M, Sedliak M, Alen M, Cheng S
Laboratory Centre for Sport Science and Medicine, Guangzhou Institute of Physical Education, Guangzhou, China.
Int J Sports Med. 2009 Oct;30(10):719-24. doi: 10.1055/s-0029-1225329. Epub 2009 Aug 14.
This study was designed to assess the effects of strength training on work capacity and parasympathetic heart rate modulation during exercise in physically inactive men. Seventy-four men aged 20-45 were randomly assigned to training (n=52) and control (n=22) groups. Training groups underwent 10-weeks of progressive strength training. Body composition, one-repetition maximum half-squat and maximal oxygen uptake were measured before and after the intervention. Respiratory gases, heart rate and blood lactate were recorded during a VO2max test on a cycle ergometer. Parasympathetic heart rate modulation was analyzed based on the standard deviation of instantaneous beat-to-beat R-R interval variability (SD1) and its normalized unit (SD1n). Muscle strength and lean body mass increased in the training group. Compared to the control group, time to exhaustion increased significantly in the training group (p<0.05). SD1 and SD1n were elevated in the training group at submaximal exercise intensities (100 W, p<0.05). Blood lactate decreased at submaximal intensities when compared to the control group. Strength training increased exercise capacity, and improved vagal modulation of heart rate at submaximal exercise intensities. These changes may have favourable cardiovascular health implications for sedentary men during normal daily activities.
本研究旨在评估力量训练对缺乏运动的男性在运动期间工作能力和副交感神经心率调节的影响。74名年龄在20至45岁之间的男性被随机分为训练组（n = 52）和对照组（n = 22）。训练组进行了为期10周的渐进性力量训练。在干预前后测量身体成分、一次重复最大半蹲和最大摄氧量。在自行车测力计上进行最大摄氧量测试期间记录呼吸气体、心率和血乳酸。基于逐搏R-R间期变异性的标准差（SD1）及其标准化单位（SD1n）分析副交感神经心率调节。训练组的肌肉力量和去脂体重增加。与对照组相比，训练组的疲劳时间显著增加（p<0.05）。在次最大运动强度（100 W，p<0.05）下，训练组的SD1和SD1n升高。与对照组相比，次最大强度下血乳酸降低。力量训练提高了运动能力，并改善了次最大运动强度下心率的迷走神经调节。这些变化可能对久坐男性在正常日常活动中的心血管健康产生有利影响。
