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Effects of exercise-induced low back pain on intrinsic trunk stiffness and paraspinal muscle reflexes.

Authors
Miller-EM; Bazrgari-B; Nussbaum-MA; Madigan-ML
Source
J Biomech 2013 Feb; 46(4):801-805
NIOSHTIC No.
20043142
Abstract
The purpose of this study was to (1) compare trunk neuromuscular behavior between individuals with no history of low back pain (LBP) and individuals who experience exercise-induced LBP (eiLBP) when pain free, and (2) investigate changes in trunk neuromuscular behavior with eiLBP. Seventeen young adult males participated including eight reporting recurrent, acute eiLBP and nine control participants reporting no history of LBP. Intrinsic trunk stiffness and paraspinal muscle reflex delay were determined in both groups using sudden trunk flexion position perturbations 1-2 days following exercise when the eiLBP participants were experiencing an episode of LBP (termed post-exercise) and 4-5 days following exercise when eiLBP had subsided (termed post-recovery). Post-recovery, when the eiLBP group was experiencing minimal LBP, trunk stiffness was 26% higher in the eiLBP group compared to the control group (p=0.033) and reflex delay was not different (p=0.969) between groups. Trunk stiffness did not change (p=0.826) within the eiLBP group from post-exercise to post-recovery, but decreased 22% within the control group (p=0.002). Reflex delay decreased 11% within the eiLBP group from post-exercise to post-recovery (p=0.013), and increased 15% within the control group (p=0.006). Although the neuromuscular mechanisms associated with eiLBP and chronic LBP may differ, these results suggest that previously-reported differences in trunk neuromuscular behavior between individuals with chronic LBP and healthy controls reflect a combination of inherent differences in neuromuscular behavior between these individuals as well as changes in neuromuscular behavior elicited by pain.
Keywords
Biomechanics; Physiology; Physical-fitness; Humans; Men; Adolescents; Etiology; Back-injuries; Musculoskeletal-system; Musculoskeletal-system-disorders; Neuromuscular-function; Neuromuscular-system; Neuromuscular-system-disorders; Behavior; Age-groups; Muscle-function; Muscles; Statistical-analysis; Author Keywords: Low backpain; Exercise; Trunk stiffness; Reflex
Contact
Michael L. Madigan, Engineering Science and Mechanics (0219), Virginia Tech, Blacksburg, VA 24061
CODEN
JBMCB5
Publication Date
20130222
Document Type
Journal Article
Email Address
mlmadigan@vt.edu
Funding Type
Grant
Fiscal Year
2013
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-008504; M102013
Issue of Publication
4
ISSN
0021-9290
Source Name
Journal of Biomechanics
State
VA; KY
Performing Organization
Virginia Polytechnic Institute and State University
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