Asymmetrical and smaller size of trunk muscles in combat sports athletes with lumbar intervertebral disc degeneration.

Abstract

BACKGROUND:

Lumbar intervertebral disc degeneration (LDD) frequently occurs in athletes. Associations between LDD and trunk muscles still remain unclear.

PURPOSE:

This study examined whether there is an association between the prevalence of LDD and the symmetry and size of the cross-sectional areas (CSAs) of the trunk muscles in combat sports athletes.

METHODS:

Participants in this study were 151 collegiate male combat sports athletes. A total of 755 lumbar intervertebral discs from L1-2 to L5-S1 in 151 athletes were assessed using magnetic resonance imaging (MRI) and a comprehensive grading system of LDD (grades I-V). All 151 athletes were divided into 2 groups: LDD and non-LDD. CSAs of trunk muscles at the L3-4 disc level were measured using MRI.

RESULTS:

Sixty-nine athletes had LDD at 1 or more disc levels (45.7 %). The LDD grade for the lower 2 disc levels was significantly higher than that for the other disc levels (p < 0.001). The CSAs of the left and right sides in trunk muscles were significantly asymmetrical, independent of the LDD which was prevalent in the disc levels (obliques: p = 0.040; quadratus lumborum: p < 0.001). The relative CSAs of trunk muscles to their body weight in the LDD group were significantly smaller than those in the non-LDD group (rectus abdominis: p = 0.011; obliques: p = 0.024; quadratus lumborum: p = 0.006; lumbar erector spinae plus multifidus: p = 0.001).

CONCLUSION:

This study suggests that the prevalence of LDD is associated with asymmetrical and relatively smaller CSAs of trunk muscles in combat sports athletes.

KEYWORDS:

Asymmetrical anatomy; Contact sports; Muscle atrophy; Radiological abnormality


Autor / Fonte:Kazunori Iwai, Koji Koyama, Takashi Okada, Koichi Nakazato, Ray Takahashi, Shingo Matsumoto, Yosuke Yamamoto, Kenji Hiranuma SpringerPlus 2016, 5 (1): 1474
Link: https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/27652049/