Control of the lateral abdominal muscles during walking

Hu, Hai, Meijer, Onno G., Hodges, Paul W., Bruijn, Sjoerd M., Strijers, Rob L., Nanayakkara, Prabath W.B., van Royen, Barend J., Wu, Wen Hua, Xia, Chun and van Dieen, Jaap H. (2012) Control of the lateral abdominal muscles during walking. Human Movement Science, 31 4: 880-896. doi:10.1016/j.humov.2011.09.002


Author Hu, Hai
Meijer, Onno G.
Hodges, Paul W.
Bruijn, Sjoerd M.
Strijers, Rob L.
Nanayakkara, Prabath W.B.
van Royen, Barend J.
Wu, Wen Hua
Xia, Chun
van Dieen, Jaap H.
Title Control of the lateral abdominal muscles during walking
Journal name Human Movement Science   Check publisher's open access policy
ISSN 0167-9457
1872-7646
Publication date 2012
Year available 2011
Sub-type Article (original research)
DOI 10.1016/j.humov.2011.09.002
Open Access Status
Volume 31
Issue 4
Start page 880
End page 896
Total pages 17
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2012
Language eng
Abstract Transversus abdominis (TA), obliquus internus (OI), and obliquus externus (OE) are involved in multiple functions: breathing, control of trunk orientation, and stabilization of the pelvis and spine. How these functions are coordinated has received limited attention. We studied electromyographic (EMG) activity of right-sided muscles and 3-dimensional moments during treadmill walking at six different speeds (1.4–5.4 km/h) in sixteen healthy young women. PCA revealed time series of trunk moments to be consistent across speeds and subjects though somewhat less in the sagittal plane. All three muscles were active during ⩾75% of the stride cycle, indicative of a stabilizing function. Clear phasic modulations were observed, with TA more active during ipsilateral, and OE during contralateral swing, while OI activity was largely symmetrical. Fourier analysis revealed four main frequencies in muscle activity: respiration, stride frequency, step frequency, and a triphasic pattern. With increasing speed, the absolute power of all frequencies remained constant or increased; the relative power of respiration and stride-related activities decreased, while that of step-related activity and the triphasic pattern increased. Effects of speed were gradual, and EMG linear envelopes had considerable common variance (>70%) across speeds within subjects, suggesting that the same functions were performed at all speeds. Maximum cross-correlations between moments and muscle activity were 0.2–0.6, and further analyses in the time domain revealed both simultaneous and consecutive task execution. To deal with conflicting constraints, the activity of the three muscles was clearly coordinated, with co-contraction of antagonists to offset unwanted mechanical side-effects of each individual muscle.
Keyword Electromyography
Multitasking
Gait
Coordination
Conflicting constraints
Lateral abdominal muscles
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 26 November 2011.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Health and Rehabilitation Sciences Publications
 
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Created: Mon, 27 Feb 2012, 13:33:54 EST by Professor Paul Hodges on behalf of School of Health & Rehabilitation Sciences