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Journal Article
Observational Study
The Effect of Current Low Back Pain on Volitional Preemptive Abdominal Activation During a Loaded Forward Reach Activity.
PM & R : the Journal of Injury, Function, and Rehabilitation 2017 Februrary
BACKGROUND: 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) × 2 (contraction) × 2 (reach) analysis of variance demonstrated a significant group × 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.
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) × 2 (contraction) × 2 (reach) analysis of variance demonstrated a significant group × 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.
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