Article

A volitional preemptive abdominal contraction (VPAC) supports trunk
stability during functional activity. Pain-free individuals can sustain VPAC
during function, but such has not been reported for individuals with current low
back pain (cLBP). OBJECTIVE: To examine whether cLBP affects VPAC performance
during a loaded forward reach (LFR) task. DESIGN: Observational crossover study.
SETTING: Laboratory. PARTICIPANTS: A total of 18 controls and 17 subjects with
cLBP with pain ratings of 1/10 to 4/10 on a visual analog scale. INTERVENTIONS:
Transverse abdominis (TrA) thickness measurements were recorded by blinded
researchers from M-mode ultrasound imaging during 4 conditions: (1) quiet
standing without abdominal drawing-in maneuver (ADIM); (2) quiet standing with
ADIM; (3) LFR without ADIM; and (4) LFR with ADIM. A physical therapist with 29
years of experience collected historical and examination data. MAIN OUTCOME MEASURES: TrA muscle thickness (mm). RESULTS: A 2 (group) x 2 (contraction) x 2
(reach) analysis of variance demonstrated a significant group x contraction
interaction (F [1, 31] = 4.499, P = .04) where ADIM produced greater TrA
thickness increases in PLBP subjects (2.18 mm) versus controls (1.36 mm). We
observed a significant main effect for reach (F [1, 31] = 14.989, P < .001),
where LFR activity produced a greater TrA thickness (6.15 +/- 2.48 mm) versus
quiet standing (5.30 +/- 2.12 mm). CONCLUSIONS: Subjects with cLBP demonstrated a
greater increase in TrA activation during ADIM versus controls.
CI - Copyright (c) 2017 American Academy of Physical Medicine and Rehabilitation.
Published by Elsevier Inc. All rights reserved.

Langue : ANGLAIS