Article

OBJECTIVE: To determine whether erector spinae muscle oxygenation (OXY) and blood
volume during a progressive isoinertial lifting evaluation (PILE) are modified by
an exercise therapy program. DESIGN: Pre- (t1) and post- (t2) exercise therapy
experimental design. SETTING: Hospital. PARTICIPANTS: Subjects with chronic low
back pain (LBP group) (n=24) and healthy subjects (control group) (n=24) were
evaluated. INTERVENTION: Exercise program. OUTCOME MEASURES: The control
group was evaluated once, and the LBP group was evaluated before (t1) the
exercise therapy program and 28 days thereafter (t2). The maximal load lifted,
total work, and total power were determined using the PILE test. Continuous-wave
near-infrared spectroscopy was used to measure OXY and blood volume during the
PILE test. RESULTS: The maximal load lifted, total power, and total work were
significantly lower in the LBP group (-42%+/-5%, -46%+/-6%, and -67%+/-6% at t1,
respectively; P<.05) than the control group. In the LBP subjects, these
parameters improved significantly after the exercise therapy program (+20%+/-3%,
+56%+/-4%, and +61%+/-5%; P<.05). At each submaximal power (ie, 25, 50, 75, and
100% of maximal load lifted at t1), OXY and blood volume were significantly
higher at t2 than t1. One-half recovery time for OXY was significantly higher in
the LBP group (at t1 and t2) than in control subjects. CONCLUSIONS: The findings
in this study suggest that LBP subjects present an impairment in their capacity
to deliver oxygen at the level of the erector spinae muscle, which can be partly
restored by an exercise therapy program.
CI - Copyright (c) 2013 American Congress of Rehabilitation Medicine. Published by
Elsevier Inc. All rights reserved.

Langue : ANGLAIS