Adaptations in maximal motor unit discharge rate to strength training in young and older adults.
Adaptations in maximal motor unit discharge rate to strength training in young and older adults.
复制标题
最大运动单位放电率对年轻人和老年人力量训练的适应。
DOI：
10.1002/mus.1038
复制
发表时间：
2001
期刊：
影响因子：
3.4
通讯作者：
Rowland,DM
中科院分区：
文献类型：
--
作者：
Patten,C;Kamen,G;Rowland,DM
6名年轻人(平均年龄为23岁)和6名老年人(平均年龄为76岁)参加了为期6周的等长阻力训练，每周5天。这项任务包括等长的第五个手指被绑架。在训练0、2、14和42d时，使用四丝针电极和自动棘波识别软件获得每只手的最大运动单位放电率(MUDR)。与先前的研究结果一致的是，在基线时，老年人的最大最大尿流率显著降低(P<；0.001)，年轻人的平均心率为51.5HZ(±17.13HZ)，老年人的平均心率为43.3HZ(±14.88HZ)。作为对阻力训练的反应，年轻人的最大自愿力增加了25%，老年人增加了33%(P<；0.001)。最大MUDR在第2天显著增加(年轻人11%，老年人23%)[F(3，36)=2.58，P<；0.05]，但老年受试者此后恢复到基线水平。小指展肌MUDR的这些适应表明，对加强第五指外展有两个部分的反应：早期解除抑制，然后改变MU的激活。
Six young (mean = 23 years) and 6 older (mean = 76 years) adults participated in isometric resistance training 5 days/week for 6 weeks. The task involved isometric fifth finger abduction. Maximal motor unit discharge rates (MUDRs) were obtained from the abductor digiti minimi of each hand at 0, 2, 14, and 42 days of training using a quadrifilar needle electrode and automatic spike recognition software. In agreement with previous findings, maximal MUDR at baseline was significantly lower in older adults (P< 0.001), averaging 51.5 (±17.13) HZin young and 43.3 (±14.88) HZin older adults. In response to resistance training, maximal voluntary force increased 25% in young and 33% in older subjects (P< 0.001). Maximal MUDR increased significantly (11% young, 23% older) on day 2 [F(3,36) = 2.58,P< 0.05], but in older subjects returned to baseline levels thereafter. These adaptations in abductor digiti minimi MUDR suggest a two‐part response to strengthening fifth finger abduction: early disinhibition followed by altered MU activation.© 2001 John Wiley & Sons, Inc. Muscle Nerve 24:542–550, 2001