Abstract
The aim of this study was to determine the within-day and between-days reliability of surface electromyographic (EMG) power spectral analysis in assessing fatigability of the vastus medialis (VM) muscle during knee and hip flexion under constant load application. The subjects were 13 healthy adult men free of knee abnormalities. Surface EMG was recorded from vastus medialis obliquus (VMO) and vastus medialis longus (VML) during sustained isometric contractions at 60% of maximal voluntary contraction until exhaustion on the leg press machine (static leg press test). Linear regression analysis was applied to median frequency (MF) time series to calculate initial MF and MF slope. For VMO and VML, the initial MF showed moderate to high reliability, while the MF slope showed high reliability (Intraclass correlation coefficient (ICC) = initial MF: 0.63 - 0.92, MF slope: 0.70 - 0.86). The results demonstrated that spectral analysis of surface EMG recording during isometric VM muscle contraction has high within-day and between-days reliability in the assessment of fatigability of the VMO and VML.
Highlights
Surface EMG was recorded from vastus medialis obliquus (VMO) and vastus medialis longus (VML) during sustained isometric contractions at 60% of maximal voluntary contraction until exhaustion on the leg press machine
The results demonstrated that spectral analysis of surface EMG recording during isometric VM muscle contraction has high within-day and between-days reliability in the assessment of fatigability of the VMO and VML
The results suggest that EMG power spectral analysis of the VM muscle during the leg load press test is highly reliable method for assessment of VM muscle fatigability
Summary
The strength of the quadriceps muscle correlates with locomotor function in pa-. Y. Minoshima et al 44 tients with osteoarthritis of the knee [1] [2]. There are two components of VM; VMO and VML [5]. The VML, the proximal part of VM, inserts into the base of the patella, while the VMO, the distal part of the VM, originates mainly from the adductor magnus tendon and inserts at the medial margin of the patella. The quadriceps muscle becomes weak after injury to and reconstruction of the anterior cruciate ligament [6] [7] [8] [9], and weakness after the latter is associated with fatigue resistance [10]
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