Positive adaptations to weight-lifting training in the elderly.
Positive adaptations to weight-lifting training in the elderly.
复制标题
老年人对举重训练的积极适应。
DOI：
10.1152/jappl.1990.69.5.1725
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发表时间：
1990
影响因子：
3.3
通讯作者：
D. Sale
中科院分区：
文献类型：
--
作者：
A. Brown;N. McCartney;D. Sale
对14名老年男性在12周举重训练前后的最大举重成绩、等长力量、等速扭矩、全肌和单肌纤维横截面积以及肌肉诱发的收缩特性进行了评估。单臂动态屈肘训练使一次可抬起的最大负荷平均增加48%(1rM)，等速扭矩改善较小(8.8%)，但等长力量无明显变化。在对侧对照臂，1rM和等速扭矩分别增加了12.7和6.5%，但等长力量没有改变。插入式抽动技术证实，在训练前后肘屈肌的最大等长收缩期间，运动单位完全激活。双侧压腿训练的等速扭矩和动态举重能力分别平均提高17%和23%。受试者肘屈肌(二头肌和肱二头肌)的平均最大横截面积在训练组增加了17.4%，但对照组没有变化。训练组肱二头肌中II型纤维的平均面积增加(30.2%)大于对照组(10.7%，P<0.05)。训练后肘屈肌诱发的收缩特性最显著的变化是抽动半松弛时间的增加。结论是，老年人在超负荷训练中保持着显著提高力量表现和上肢肌肉肥大的潜力。
Maximal weight-lifting performance, isometric strength, isokinetic torque, whole muscle and individual fiber cross-sectional areas, and muscle evoked contractile properties were assessed in 14 elderly males before and after 12 wk of weight-lifting training. Dynamic elbow flexion training of one arm resulted in a significant 48% mean increase in the maximal load that could be lifted once (1 RM) and a smaller improvement in isokinetic torque (8.8%) but no change in isometric strength. In the contralateral control arm, 1 RM and isokinetic torque increased by 12.7 and 6.5%, respectively, but isometric strength did not change. The interpolated twitch technique confirmed complete motor unit activation during a maximal isometric contraction of the elbow flexors before and after the training. Bilateral leg press training effected mean increases of 17 and 23% in isokinetic torque and dynamic lifting capacity, respectively. The mean maximal cross-sectional area of the elbow flexors (biceps brachii and brachialis) increased by 17.4% in the trained arm but did not change the control arm. The increase in the mean area of type II fibers in the biceps brachii muscle in the trained arm (30.2%) was greater than the corresponding change in the control arm (10.7%, P less than 0.05). The most significant change in the evoked contractile properties of the trained elbow flexors was the increase in twitch half-relaxation time. It is concluded that older individuals retain the potential for significant increases in strength performance and upper limb muscle hypertrophy in response to overload training.
人体肘屈肌的等距扭矩-角度关系和运动相关活动：对平衡点假设的影响。
DOI：
--
发表时间：
1985
期刊：
Experimental brain research. Experimentelle Hirnforschung. Experimentation cerebrale
影响因子：
--
作者：
Hasan,Z;Enoka,RM
通讯作者：
Enoka,RM
影响因子：
2.4
作者：
AN, KN;HUI, FC;CHAO, EY
通讯作者：
CHAO, EY
DOI：
10.1152/jappl.1989.67.6.2600
发表时间：
1989
期刊：
Journal of applied physiology (Bethesda, Md. : 1985)
影响因子：
--
作者：
Kandarian,SC;White,TP
通讯作者：
White,TP