Effects of 8-Week Exhausting Deep Knee Flexion Flywheel Training on Persistent Quadriceps Weakness in Well-Trained Athletes Following Anterior Cruciate Ligament Reconstruction

Frederick James Henderson, Yu Konishi, Norihiro Shima and Yohei Shimokochi ()
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Frederick James Henderson: Department of Health and Sport Management, Osaka University of Health and Sport Sciences, Sennan-gun 590-0496, Japan
Yu Konishi: Department of Physical Education, National Defense Academy of Japan, Yokosuka 239-8686, Japan
Norihiro Shima: Department of Sport and Health Science, Tokai Gakuen University, Miyoshi 470-0207, Japan
Yohei Shimokochi: Department of Health and Sport Management, Osaka University of Health and Sport Sciences, Sennan-gun 590-0496, Japan

IJERPH, 2022, vol. 19, issue 20, 1-13

Abstract: Persistent quadriceps weakness after anterior cruciate ligament (ACL) reconstruction is a common hurdle to efficient rehabilitation. Therefore, we evaluated a new treatment strategy for athletes with ACL reconstruction. Eleven athletes with unilateral ACL reconstruction performed one set of flywheel Bulgarian split squats to exhaustion with a maximum knee extension of 60°, over 16 sessions, on their reconstructed limb. Quadriceps rate of force development (RFD) 0–50 ms (RFD 0–50 ms ), and 0–150 ms (RFD 0–150 ms ), maximum voluntary isometric contraction (MVIC), and central activation ratio (CAR) were measured bilaterally on the week before and after the intervention. In the reconstructed limb, the RFD 0–50 ms ( p = 0.04; Cohen’s d = 0.8) and RFD 0–150 ms ( p = 0.03; d = 0.9) increased after training. Before-after changes in MVIC and CAR were not significant ( p > 0.05), but the lower the baseline MVIC, the greater the gain in MVIC ( r = −0.71, p = 0.02). The between-leg difference in MVIC changed from large before ( p = 0.01; d = 0.8) to small after training ( p = 0.04; d = 0.4). One set of deep knee flexion flywheel Bulgarian split squats to exhaustion improved quadriceps deficits in well-trained athletes with ACL-reconstruction, particularly those with relatively low quadriceps force production.

Keywords: knee; strength; ACL; inertial training; resistance training; rehabilitation (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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