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Effect of knee joint angle on the neuromuscular activation of the quadriceps femoris during repetitive fatiguing contractions.
J Electromyogr Kinesiol. 2019 Dec; 49:102356.JE

Abstract

We assessed the effect of knee joint angle on the EMG amplitude and frequency of the four individual muscles in the quadriceps femoris during repetitive fatiguing maximum voluntary contractions (MVCs). Fifteen healthy men and women performed two fatiguing tasks consisting of 40 MVCs in flexion (80°) and extension (140˚) (full extension = 180˚). Neuromuscular activation of the vastus intermedius (VI), vastus lateralis (VL), vastus medialis (VM), and rectus femoris (RF) was recorded using surface electrodes, and median frequency (MF) and root mean square (RMS) of electromyographic (EMG) signals (normalized by pre-test MVCs) were calculated. MVCs significantly decreased from the 10th to the 40th repetition in both flexion and extension. The MFs of VI and VM in flexion and that of RF flexion and extension were significantly decreased after the 10th repetition. There were no significant changes in normalized EMG amplitude in any muscles specific to knee angle. Stepwise regression analysis suggested that predictive synergistic action may occur in RF/VM and RF/VI in flexion and in RF/VM in extension. This suggest that EMG MF of RF/VM is independent, but that of RF/VI and RF/VL is dependent upon knee joint angle, which may, in part, explain joint angle-specific muscle fatigue.

Authors+Show Affiliations

Research Center of Health, Physical Fitness & Sports, Nagoya University Furo, Chikusa, Nagoya, Aichi 4648601, Japan; Graduate School of Education and Human Development Furo, Chikusa, Nagoya, Aichi 4648601, Japan. Electronic address: akima@nagoya-u.jp.Graduate School of Education and Human Development Furo, Chikusa, Nagoya, Aichi 4648601, Japan; School of International Liberal Studies, Chukyo University, 101-2 Yagoto-Honmachi, Showa, Nagoya, Aichi 4668666, Japan.Department of Sports Research, Japan Institute of Sports Sciences, 3-15-1 Nishigaoka, Kita, Tokyo 1150056, Japan.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31557704

Citation

Akima, Hiroshi, et al. "Effect of Knee Joint Angle On the Neuromuscular Activation of the Quadriceps Femoris During Repetitive Fatiguing Contractions." Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology, vol. 49, 2019, p. 102356.
Akima H, Tomita A, Ando R. Effect of knee joint angle on the neuromuscular activation of the quadriceps femoris during repetitive fatiguing contractions. J Electromyogr Kinesiol. 2019;49:102356.
Akima, H., Tomita, A., & Ando, R. (2019). Effect of knee joint angle on the neuromuscular activation of the quadriceps femoris during repetitive fatiguing contractions. Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology, 49, 102356. https://doi.org/10.1016/j.jelekin.2019.102356
Akima H, Tomita A, Ando R. Effect of Knee Joint Angle On the Neuromuscular Activation of the Quadriceps Femoris During Repetitive Fatiguing Contractions. J Electromyogr Kinesiol. 2019;49:102356. PubMed PMID: 31557704.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of knee joint angle on the neuromuscular activation of the quadriceps femoris during repetitive fatiguing contractions. AU - Akima,Hiroshi, AU - Tomita,Aya, AU - Ando,Ryosuke, Y1 - 2019/09/12/ PY - 2019/04/23/received PY - 2019/08/16/revised PY - 2019/09/11/accepted PY - 2019/9/27/pubmed PY - 2020/2/11/medline PY - 2019/9/27/entrez KW - Fatigue KW - Knee joint angle KW - Quadriceps femoris SP - 102356 EP - 102356 JF - Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology JO - J Electromyogr Kinesiol VL - 49 N2 - We assessed the effect of knee joint angle on the EMG amplitude and frequency of the four individual muscles in the quadriceps femoris during repetitive fatiguing maximum voluntary contractions (MVCs). Fifteen healthy men and women performed two fatiguing tasks consisting of 40 MVCs in flexion (80°) and extension (140˚) (full extension = 180˚). Neuromuscular activation of the vastus intermedius (VI), vastus lateralis (VL), vastus medialis (VM), and rectus femoris (RF) was recorded using surface electrodes, and median frequency (MF) and root mean square (RMS) of electromyographic (EMG) signals (normalized by pre-test MVCs) were calculated. MVCs significantly decreased from the 10th to the 40th repetition in both flexion and extension. The MFs of VI and VM in flexion and that of RF flexion and extension were significantly decreased after the 10th repetition. There were no significant changes in normalized EMG amplitude in any muscles specific to knee angle. Stepwise regression analysis suggested that predictive synergistic action may occur in RF/VM and RF/VI in flexion and in RF/VM in extension. This suggest that EMG MF of RF/VM is independent, but that of RF/VI and RF/VL is dependent upon knee joint angle, which may, in part, explain joint angle-specific muscle fatigue. SN - 1873-5711 UR - https://www.unboundmedicine.com/medline/citation/31557704/Effect_of_knee_joint_angle_on_the_neuromuscular_activation_of_the_quadriceps_femoris_during_repetitive_fatiguing_contractions_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1050-6411(19)30171-3 DB - PRIME DP - Unbound Medicine ER -