Impact of quadriceps strengthening on response to fatiguing exercise following ACL reconstruction

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• 作者：Christopher Kuenze^a ; ^{kuenzech@msu.edu} ; Moataz Eltoukhy^b ; Adam Kelly^a ; Chang-Young Kim^b
• 关键词：Disinhibitory modalities ; Muscle fatigue ; Quadriceps muscle ; Torque ; Knee injuries
• 刊名：Journal of Science and Medicine in Sport
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：20
• 期：1
• 页码：6-11
• 全文大小：557 K
• 卷排序：20

文摘

Patients commonly experience altered response to fatiguing exercise after ACL reconstruction (ACLR). The objective of this study was to assess the impact of quadriceps strengthening on response to exercise after ACLR.DesignClinical trial.MethodsTen participants with a history of primary, unilateral ACLR (sex = 9F/1M, age = 21.0 ± 2.8 years, BMI = 23.7 ± 2.7 kg/m2) and 10 healthy participants (sex = 9F/1M, age = 22.2 ± 3.2 years, BMI = 23.8 ± 3.9 kg/m2) participated. ACLR participants completed a 2-week quadriceps strengthening intervention including 14 progressive strengthening exercise sessions. Normalized knee extension maximum voluntary isometric contraction (MVIC) torque (Nm/kg) and quadriceps central activation ratio (%, CAR) were measured before and after a 30-minute fatiguing exercise protocol. ACLR participants completed testing before and after the 2-week intervention while control participants completed a single testing session.ResultsThe intervention significantly improved normalized knee extension MVIC torque (pre-intervention = 1.85 ± 0.67Nm/kg, post-intervention = 2.09 ± 0.81Nm/kg, p = 0.04) and quadriceps CAR in the ACLR involved limb (pre-intervention = 86.51 ± 5.03%, post-intervention = 92.94 ± 5.99%, p = 0.02). Quadriceps CAR (pre-intervention = 1.13 ± 9.04%, post-intervention = −3.97 ± 4.59%, p = 0.16) and normalized knee extension MVIC torque (pre-intervention = 0.26 ± 20.90%, post-intervention = −8.02 ± 12.82%, p = 0.30) response to exercise did not significantly change from pre-intervention to post-intervention conditions.ConclusionsTwo weeks of quadriceps strengthening reduced this between group difference in the involved limb which may indicate restoration of more optimal quadriceps neuromuscular function and increased demand on the quadriceps during physical activity.