Nyberg André, Saey Didier, Martin Mickaël, Maltais François
1Institut Universitaire de Cardiologie et de pneumologie de Québec, Université Laval, Québec, CANADA; 2Faculté de Médicine, Université Laval, Québec, QC, CANADA.
Med Sci Sports Exerc. 2016 Dec;48(12):2353-2361. doi: 10.1249/MSS.0000000000001027.
Exercising small muscle groups at a time allows higher muscle specific workloads compared with whole body aerobic exercises in people with chronic obstructive pulmonary disease (COPD). Whether similar effects also occur with partitioning exercise during low load/high-repetition resistance exercises is uncertain.
To investigate the acute effects of partitioning exercise on exercise workload, exertional symptoms and quadriceps muscle fatigue during low load/high-repetition resistance exercises in people with COPD and healthy controls.
We compared the acute physiological effects of single-limb (SL) versus two-limb (TL) execution of isokinetic knee extension and of six low load/high-repetition elastic resistance exercises in 20 people with COPD (forced expiratory volume in 1 s = 38% predicted) and 15 healthy controls.
Among people with COPD, SL exercises resulted in higher exercise workloads during isokinetic knee extension (17% ± 31%, P < 0.05) and elastic exercises (rowing, 17% ± 23%; leg curl, 23% ± 21%; elbow flexion, 19% ± 26%; chest press, 14% ± 15%; shoulder flexion, 33% ± 24%; and knee extension, 24% ± 18%, all P < 0.05). Muscle fatigue ratings were similar during SL compared with TL exercises, whereas dyspnea ratings were similar between conditions during isokinetic exercises and lower during SL compared with TL elastic exercises (P < 0.05). In COPD, SL knee extension resulted in greater quadriceps fatigue than TL knee extension as evidenced by a greater fall in quadriceps potentiated twitch force after the former exercise (-24% ± 10% vs -16% ± 8%, P = 0.025). In healthy controls, partitioning exercise with SL exercise did not modify workload, quadriceps fatigue nor dyspnea achieved during the various exercises.
Partitioning exercise by exercising using an SL allowed higher muscle localized exercise workloads, larger amount of quadriceps muscle fatigue with lower, or similar level of exertional symptoms during low load/high-repetition resistance exercises in people with advanced COPD.
与慢性阻塞性肺疾病（COPD）患者进行全身有氧运动相比，一次锻炼小肌肉群可使肌肉特异性负荷更高。在低负荷/高重复次数抗阻运动中进行分组运动是否也会产生类似效果尚不确定。
研究分组运动对COPD患者和健康对照者在低负荷/高重复次数抗阻运动期间运动负荷、运动症状和股四头肌疲劳的急性影响。
我们比较了20例COPD患者（第1秒用力呼气量=预测值的38%）和15名健康对照者进行单肢（SL）与双肢（TL）等速膝关节伸展以及六项低负荷/高重复次数弹性抗阻运动的急性生理效应。
在COPD患者中，SL运动在等速膝关节伸展（17%±31%，P<0.05）和弹性运动（划船，17%±23%；腿弯举，23%±21%；肘部屈曲，19%±26%；胸部按压，14%±15%；肩部屈曲，33%±24%；膝关节伸展，24%±18%，均P<0.05）期间导致更高的运动负荷。与TL运动相比，SL运动期间的肌肉疲劳评分相似，而异动症评分在等速运动期间两种情况相似，在SL弹性运动期间低于TL弹性运动（P<0.05）。在COPD患者中，SL膝关节伸展比TL膝关节伸展导致更大的股四头肌疲劳，前者运动后股四头肌增强抽搐力下降更大（-24%±10%对-16%±8%，P=0.025）证明了这一点。在健康对照者中，SL运动进行分组运动并未改变各种运动期间达到的负荷、股四头肌疲劳或呼吸困难。
在晚期COPD患者的低负荷/高重复次数抗阻运动中，通过SL运动进行分组运动可使肌肉局部运动负荷更高，股四头肌肌肉疲劳量更大，运动症状水平更低或相似。
