Effects of trunk lean and foot lift exercises in sitting position on abdominal muscle activity and the contribution rate
- PDF / 1,147,399 Bytes
- 9 Pages / 595.276 x 790.866 pts Page_size
- 49 Downloads / 136 Views
ORIGINAL ARTICLE
Effects of trunk lean and foot lift exercises in sitting position on abdominal muscle activity and the contribution rate of transversus abdominis Yoshiki Motomura1 · Hiroshige Tateuchi1 · Tomohito Komamura2 · Yuta Yagi3 · Sayaka Nakao1 · Noriaki Ichihashi1 Received: 18 January 2020 / Accepted: 19 September 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Purpose Abdominal hollowing exercise has been recommended to improve trunk stability. Trunk lean and foot lift exercises while sitting may easily promote abdominal muscle activity even in people who cannot perform abdominal hollowing consciously. The purpose of the present study was to examine the changes in abdominal muscle activity and contribution rate of the transversus abdominis muscle (TrA) when leaning the trunk and lifting the foot during sitting. Methods The muscle stiffnesses (indicators of muscle activity) of the right rectus abdominis, external oblique, internal oblique, and TrA of 14 healthy men were measured during abdominal hollowing and the following nine sitting tasks: reference posture, 15° and maximal posterior trunk lean, 20° and maximal ipsilateral and contralateral trunk lean, and ipsilateral and contralateral foot lift. The TrA contribution rate was calculated by dividing the TrA stiffness by the sum of the abdominal muscles’ stiffnesses. Results The TrA stiffness was significantly higher in abdominal hollowing than in reference posture, posterior and ipsilateral trunk lean, and ipsilateral foot lift, but not higher than in contralateral trunk lean and contralateral foot lift. There was no significant difference in the TrA contribution rates between abdominal hollowing and ipsilateral or contralateral foot lift. Conclusion The contralateral trunk lean or contralateral foot lift could enhance TrA activity for people who cannot perform abdominal hollowing consciously. The contralateral foot lift could particularly be beneficial to obtain selective activity of TrA. Keywords Abdominal hollowing · Muscle stiffness · Transversus abdominis · Internal oblique · External oblique · Rectus abdominis Abbreviations TrA Transversus abdominis muscle ANOVA Analysis of variance SWE Shear wave elastography
Communicated by Lori Ann Vallis. * Yoshiki Motomura motomura.yoshiki.32z@kyoto‑u.jp 1
Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Kyoto, Japan
2
Division of Rehabilitation Medicine, Chiba University Hospital, Chiba, Chiba, Japan
3
Department of Rehabilitation, Rinku General Medical Center, Izumisano, Osaka, Japan
Introduction The transversus abdominis muscle (TrA) plays an important role in trunk stabilization while moving the extremities (Hodges and Richardson 1996, 1998; Hodges et al. 1997; Okubo et al. 2013). Since the TrA acts to tighten the abdomen even when the activities of the other abdominal muscles remain unchanged, greater TrA activity may allow for a more effective increase in intra-abdominal pressure, which increases the stiffness of the lu
Data Loading...
