Postural muscle activity patterns during standing at rest and on an oscillating floor

Postural muscle activity pattern was examined in the eyes-closed state after adequate adaptation to floor anteroposterior oscillation. Twenty-three subjects were grouped almost evenly according to dominance of anterior or posterior postural muscles in the trunk and thigh during quiet stance. In the...

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Bibliographic Details
Published in:Journal of electromyography and kinesiology 2006-10, Vol.16 (5), p.448-457
Main Authors: Fujiwara, Katsuo, Toyama, Hiroshi, Kiyota, Takeo, Maeda, Kaoru
Format: Article
Language:English
Subjects:
Adolescent
Adult
Anterior/posterior dominance
Electromyogram
Electromyography
Female
Floor oscillation
Humans
Male
Muscle Contraction - physiology
Muscle, Skeletal - physiology
Periodicity
Physical Stimulation - methods
Postural Balance - physiology
Posture - physiology
Rest - physiology
Standing posture
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Summary:Postural muscle activity pattern was examined in the eyes-closed state after adequate adaptation to floor anteroposterior oscillation. Twenty-three subjects were grouped almost evenly according to dominance of anterior or posterior postural muscles in the trunk and thigh during quiet stance. In the posterior-dominant group, this dominance was maintained at every frequency in most subjects. In the anterior-dominant group, this dominance was maintained in most subjects at 0.1 and 0.5 Hz but changed to posterior dominance at 1.0 and 1.5 Hz in about half the subjects. Periodicity of muscle activity was evaluated by EMG amplitude spectrum at the floor oscillation frequency. Periodicity of posterior-dominant muscles in the trunk and thigh increased with increasing oscillatory frequency. In the trunk, the periodicity did not differ significantly between posterior-dominant and anterior-dominant groups. However, in the thigh, periodicity was significantly lower in the anterior-dominant muscles. This was considered to be caused by nonperiodic alternating action of the anterior and posterior muscles. In the lower leg, posterior dominance was observed in quiet stance and at all oscillation frequencies. Periodicity of soleus and gastrocnemius increased at higher frequencies and was higher in gastrocnemius than in soleus. The periodicity difference between both muscles decreased with increasing oscillation frequency.
ISSN:1050-6411
1873-5711
DOI:10.1016/j.jelekin.2005.08.008