Uniformed Services University, Bethesda, Maryland; and.
Biomechanics Laboratory, The Pennsylvania State University, University Park, Pennsylvania.
J Strength Cond Res. 2024 Sep 1;38(9):1635-1639. doi: 10.1519/JSC.0000000000004824. Epub 2024 Jul 23.
Leonard, C and Challis, JH. The expression of the force-length properties of the gastrocnemius in ice hockey players. J Strength Cond Res 38(9): 1635-1639, 2024-Although the force-length properties of muscles have an approximately parabolic shape, in vivo not all the force-length curve is necessarily used, only a portion of the curve is expressed (i.e., ascending, plateau, or descending regions of the force-length curve). The number of sarcomeres in series in a muscle fiber affects the expressed section of the force-length curve; this number can be influenced by the nature of activity the muscle experiences. It was hypothesized that the reduced range of motion ice skaters experience, because of the constraints imposed by the ice skates, that the gastrocnemii of a group of ice skaters will adapt and will more frequently express in vivo the plateau of the force-length curve compared with a nonspecifically trained population. Twelve NCAA Division I female ice hockey players volunteered for the study. Their maximum isometric ankle plantarflexion moments were recorded for 6 ankle angles and 3 knee angles. Exploiting the biarticularity of the gastrocnemius, the expressed sections of the subject's force-length curves were determined. Six subjects operated over the ascending limb, 5 operated over the plateau region, and 1 over the descending limb. This frequency of distribution for ice hockey players was statistically different to the distribution measured for 28 nonspecifically trained subjects from a previous study ( p < 0.0001). These results likely reflect morphological differences between the 2 groups for their gastrocnemii, potentially arising from the limited range of gastrocnemius length feasible in ice-skates. These results have implications for the specificity of their off-ice training for ice hockey players.
伦纳德和查利斯。冰球运动员比目鱼肌的力-长特性表达。J 力量与调理研究 38（9）：1635-1639，2024-尽管肌肉的力-长特性具有近似抛物线形状，但在体内并非所有力-长曲线都必然被使用，仅表达曲线的一部分（即力-长曲线的上升、平台或下降区域）。肌肉纤维中的串联肌节数量会影响力-长曲线的表达部分；这个数量可以受到肌肉经历的活动性质的影响。假设滑冰者由于冰鞋的限制而经历的运动范围较小，一组滑冰者的比目鱼肌将适应并更频繁地在体内表达力-长曲线的平台，与非特异性训练的人群相比。12 名 NCAA 一级女子冰球运动员自愿参加了这项研究。他们的最大等距踝关节跖屈力矩在 6 个踝关节角度和 3 个膝关节角度下被记录下来。利用比目鱼肌的双关节性，确定了受试者力-长曲线的表达部分。6 名受试者在上升支上运作，5 名受试者在平台区运作，1 名受试者在下降支上运作。这种冰球运动员的分布频率与之前一项研究中测量的 28 名非特异性训练受试者的分布有统计学差异（p<0.0001）。这些结果可能反映了两组比目鱼肌的形态差异，这可能是由于冰鞋中可行的比目鱼肌长度范围有限所致。这些结果对冰球运动员非冰上训练的特异性有影响。
