TY - JOUR
T1 - Feedforward activation of the quadratus lumborum during rapid shoulder joint abduction
AU - Oshikawa, Tomoki
AU - Adachi, Gen
AU - Akuzawa, Hiroshi
AU - Okubo, Yu
AU - Kaneoka, Koji
N1 - Funding Information:
We thank all subjects in this study for their cooperation. This study was supported by a grant-in-Aid for Scientific Research (C) from the Japan Society for the Promotion of Science . We would like to thank Editage ( www.editage.com ) for English language editing.
Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2020/10
Y1 - 2020/10
N2 - This study aimed to clarify the difference in the onset of EMG activity between eight trunk muscles, including the anterior (QL-a) and posterior (QL-p) layers of the quadratus lumborum during rapid shoulder joint abduction. Thirteen healthy men participated in this study. Electromyography of the QL-a, QL-p, transversus abdominis (TrA), internal oblique (IO), external oblique (EO), rectus abdominis (RA), lumbar multifidus (LMF), lumbar erector spinae (LES) on non-movement side, and middle deltoid (MD) on the movement side were measured. Subjects who were standing in a relaxed position performed rapid shoulder abduction with the dominant hand after light stimulus with or without a 3 kg wrist weight. Two-way ANOVA (muscles × weight conditions) was used to compare the onset of trunk muscles relative to that of MD. There was a significant main effect of the muscles. The onset of the QL-a, QL-p, and TrA was significantly earlier than that of the IO, EO, LMF, and LES (P < 0.01). This result suggests that the activities of the QL-a, QL-p, and TrA have a crucial role in controlling the center of mass within the base of support and stabilizing the lumbar spine in the coronal plane during shoulder abduction.
AB - This study aimed to clarify the difference in the onset of EMG activity between eight trunk muscles, including the anterior (QL-a) and posterior (QL-p) layers of the quadratus lumborum during rapid shoulder joint abduction. Thirteen healthy men participated in this study. Electromyography of the QL-a, QL-p, transversus abdominis (TrA), internal oblique (IO), external oblique (EO), rectus abdominis (RA), lumbar multifidus (LMF), lumbar erector spinae (LES) on non-movement side, and middle deltoid (MD) on the movement side were measured. Subjects who were standing in a relaxed position performed rapid shoulder abduction with the dominant hand after light stimulus with or without a 3 kg wrist weight. Two-way ANOVA (muscles × weight conditions) was used to compare the onset of trunk muscles relative to that of MD. There was a significant main effect of the muscles. The onset of the QL-a, QL-p, and TrA was significantly earlier than that of the IO, EO, LMF, and LES (P < 0.01). This result suggests that the activities of the QL-a, QL-p, and TrA have a crucial role in controlling the center of mass within the base of support and stabilizing the lumbar spine in the coronal plane during shoulder abduction.
KW - Onset of electromyographic activity
KW - Quadratus lumborum
KW - Rapid shoulder joint movement
KW - Transversus abdominis
KW - Trunk muscles
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U2 - 10.1016/j.jelekin.2020.102453
DO - 10.1016/j.jelekin.2020.102453
M3 - Article
C2 - 32702439
AN - SCOPUS:85088104438
SN - 1050-6411
VL - 54
JO - Journal of Electromyography and Kinesiology
JF - Journal of Electromyography and Kinesiology
M1 - 102453
ER -