Article

OBJECTIVE: To determine whether healthy adults successfully completing
transversus abdominis (TrA) muscle activation training in the supine position
with clinician and ultrasound (US) imaging feedback increase their TrA activation
during lifting and reaching tasks performed in the standing position. DESIGN:
Prospective longitudinal within-subject, repeated-measures (RM) study. SETTING: University laboratory. PARTICIPANTS: A total of 19 of 24 asymptomatic adult
volunteers met inclusion criteria. METHODS: Each adult performed 3 trials of 5
functional tasks before receiving any training. They were then briefed on the
abdominal draw-in maneuver via educational materials. Next, each adult received
individualized TrA activation training while in the supine position with
clinician and US feedback of TrA activation. At 5 minutes after TrA activation
training, each adult who met the criterion during training performed 3 trials of
these same 5 functional tasks. Tasks were randomized during these test sessions.
Adults who returned 5 months later (n = 10) were tested again on 3 trials of 3 of
these tasks. No feedback was provided during test sessions. Recorded cine loop
images were obtained via US per trial and masked for TrA measurement. MAIN
OUTCOME MEASUREMENTS: Resting state (minimum thickness) and contraction state
(maximum thickness) of TrA were measured per recorded trial by a clinician who
was shown to have high reliability. The percentage of change in TrA thickness
{[(thicknessmax - thicknessmin)/ thicknessmin] x (100)} was the primary outcome
measure. Trial averages were formed per measure per task per test session per
adult. RESULTS: A 2-test sessions (pretraining, 5-minutes post-training) x 5
tasks RM analysis of variance (N = 19) indicated a significant and large effect
for test sessions (P < .001, eta(2) = 0.808) and moderate effect for tasks (P =
.011; eta(2) = 0.164). Likewise, a 3-test sessions (pretraining, 5-minutes
posttraining, 5 months post-training) x 3 tasks RM analysis of variance (n = 10)
indicated a significant and large test sessions effect (P < .001, eta(2) = 0.57)
and no task effect. Overall, the percent change in TrA thickness increased after
the TrA activation training program and was maintained at 5 months; similar
patterns of improvement were noted across test sessions and tasks. CONCLUSION:
Asymptomatic adults successfully completing a short session of TrA activation
training in the supine position with US feedback of TrA activation were able to
increase their TrA activation during loaded lifting and reaching tasks for at
least 5 months.
CI - Copyright (c) 2014 American Academy of Physical Medicine and Rehabilitation.
Published by Elsevier Inc. All rights reserved.

Langue : ANGLAIS