Faxon Jamie L, Sanni Adeola A, McCully Kevin K
Department of Kinesiology, University of Georgia, 330 River Road, Athens, GA 30602, USA.
J Funct Morphol Kinesiol. 2018 Nov 20;3(4):56. doi: 10.3390/jfmk3040056.
As the knee joint is a common site for injury among younger people, the purpose of this study was to measure the skeletal muscle endurance and strength on people with prior anterior cruciate ligament (ACL) knee reconstruction surgery.
Young healthy female subjects who reported having knee reconstruction surgery more than one-year prior were tested. The skeletal muscle endurance index (EI) of the hamstrings and quadriceps muscles was determined as the decline in the specific muscle acceleration in response to 2 Hz, 4 Hz, and 6 Hz electrical stimulation. Maximal isometric muscle strength (MVC) was measured in the hamstrings and quadriceps muscles.
The hamstrings muscles in the injured leg had less endurance than the non-injured leg at 6 Hz stimulation (55.5 ± 13.2% versus 78.0 ± 13.3%, < 0.01). Muscle endurance was not reduced in the quadriceps muscles in the injured leg compared to the non-injured leg at 6 Hz stimulation (78.0 ± 13.3% versus 80.3 ± 10.0%, = 0.45). There were no differences in MVC between the injured and non-injured legs for either the hamstrings ( = 0.20) or quadriceps muscles ( = 0.67).
Muscle endurance was reduced in the hamstrings muscles at least one-year post injury, while hamstrings strength was recovered. Reduced hamstrings muscle endurance could be a result of lack of endurance training during rehabilitation. This may contribute to re-injury in the muscle, even in people who have recovered muscle strength.
由于膝关节是年轻人受伤的常见部位，本研究的目的是测量曾接受前交叉韧带（ACL）膝关节重建手术的患者的骨骼肌耐力和力量。
对报告在一年多以前接受过膝关节重建手术的年轻健康女性受试者进行测试。通过响应2Hz、4Hz和6Hz电刺激时特定肌肉加速度的下降来确定腘绳肌和股四头肌的骨骼肌耐力指数（EI）。测量腘绳肌和股四头肌的最大等长肌力（MVC）。
在6Hz刺激下，受伤腿的腘绳肌耐力低于未受伤腿（55.5±13.2%对78.0±13.3%，P<0.01）。在6Hz刺激下，受伤腿的股四头肌耐力与未受伤腿相比没有降低（78.0±13.3%对80.3±10.0%，P=0.45）。受伤腿和未受伤腿的腘绳肌（P=0.20）或股四头肌（P=0.67）的MVC没有差异。
受伤后至少一年，腘绳肌的肌肉耐力降低，而腘绳肌力量已恢复。腘绳肌肌肉耐力降低可能是康复期间缺乏耐力训练的结果。这可能导致肌肉再次受伤，即使是那些肌肉力量已经恢复的人。
