Article

OBJECTIVE: To evaluate electromyographic activity of several paraspinal muscles
during localized stabilizing exercises and multijoint or global stabilizing
exercises. DESIGN: Cross-sectional counterbalanced repeated measures. SETTING:
Research laboratory. PARTICIPANTS: Volunteers (N=25) without low-back pain.
INTERVENTION: Subjects performed (1) localized stabilizing exercises
(callisthenic exercises with only body weight as resistance): static lumbar
extension, stable (on floor) and unstable static unipedal forward flexion, stable
dynamic unipedal forward flexion, and unstable supine bridge; and (2) global
stabilizing exercises (70% of maximum voluntary isometric contraction [MVIC]):
dead lift and lunge. MAIN OUTCOME MEASURES: Mean and maximum amplitude of the
electromyographic RMS of the lumbar and thoracic multifidus spinae and erector
spinae. Electromyographic signals were normalized to the MVIC achieved during a
back-extension exercise. RESULTS: Normalizing to the MVIC, paraspinal muscles
were significantly (P<.05) most active, with mean and peak amplitudes of 88.1%
and 113.4% during the dynamic stable dead lift at 70% of MVIC, respectively. The
supine bridge on the unstable surface obtained the significantly lowest values of
29.03% and 30.3%, respectively. The other exercises showed intermediate values
that ranged from 35.4% to 61.6%. CONCLUSION: Findings from this study may be
helpful to strength trainers and physical therapists in their choice of exercises
for strengthening paraspinal muscles. Our results suggest that in asymptomatic
young experienced subjects, the dead lift at 70% of MVIC provides higher levels
of mean and peak electromyographic signals than localized stabilizing exercises
and other types of global stabilizing exercises.
CI - Copyright (c) 2011 American Congress of Rehabilitation Medicine. Published by
Elsevier Inc. All rights reserved.

Langue : ANGLAIS