Impact of transversal calf muscle loading on plantarflexion
Impact of transversal calf muscle loading on plantarflexion
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DOI：
10.1016/j.jbiomech.2019.01.011
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发表时间：
2019-03-06
影响因子：
2.4
通讯作者：
Siebert, Tobias
中科院分区：
文献类型：
--
作者：
Stutzig, Norman;Ryan, David;Siebert, Tobias
肌肉压迫通常发生在日常生活中(例如，穿背包或紧身衣，以及在坐着时)。然而，压缩对人体收缩动力学的影响并没有得到很好的研究。以29名受试者的胫后神经为研究对象，对29名受试者的胫后神经进行刺激，以获得在有和没有横向压缩的情况下，利用压头产生的最大腓肠肌双痉挛力量，以量化外部横向负荷下人体肌肉收缩动力学和肌肉结构的变化。肌肉结构由嵌入压痕内的超声探头确定。分别在5种状态下进行5次刺激：(1)前测(未加载)、(2)压痕加载2 kg、(3)4.5 kg、(4)10 kg、(5)后测(未加载)，与测试前相比，2 kg、4.5 kg和10 kg的最大力分别下降了9%、13%和16%。半松弛时间随横向载荷的增加而增加，而力量发展速度则从试验前下降到2 kg，从4.5 kg下降到10 kg。当横向载荷从2 kg增加到4.5 kg时，压头提升高度增加，而从4.5 kg降低到10 kg。在最高的横向负荷下，抽动时的收缩增加减少。结果表明，由于横向肌肉负荷，收缩动力学发生了变化。这些变化与施加的压力、肌肉结构的变化以及肌肉力量在横向和纵向上的分配有关。(C)2019爱思唯尔有限公司。保留所有权利。
Muscle compression commonly occurs in daily life (for instance wearing backpacks or compression garments, and during sitting). However, the effects of the compression on contraction dynamics in humans are not well examined. The aim of the study was to quantify the alterations of contraction dynamics and muscle architecture in human muscle with external transverse loads.The posterior tibialis nerve of 29 subjects was stimulated to obtain the maximal double-twitch force of the gastrocnemius muscle with and without transverse compression that was generated using an indentor. The muscle architecture was determined by a sonographic probe that was embedded within the indentor. Five stimulations each were conducted at 5 conditions: (1) pretest (unloaded), (2) indentor loading with 2 kg, (3) 4.5 kg, (4) 10 kg, and (5) posttest (unloaded).Compared to the pretest maximal force decreased by 9%, 13% and 16% for 2 kg, 4.5 kg and 10 kg, respectively. The half-relaxation time increased with increased transverse load whereas the rate of force development decreased from pretest to 2 kg and from 4.5 kg to 10 kg. The lifting height of the indentor increased with transverse load from 2 kg to 4.5 kg but decreased from 4.5 kg to 10 kg. Increases in pen nation during the twitches were reduced at the highest transverse load.The results demonstrate changes of the contraction dynamics due to transversal muscle loading. Those alterations are associated with the applied pressure, changes in muscle architecture and partitioning of muscle force in transversal and longitudinal direction. (C) 2019 Elsevier Ltd. All rights reserved.