Department of Health, Kinesiology and Applied Physiology, Concordia University, Montreal, QE, Canada.
PERFORM Centre, Concordia University, Montreal, QE, Canada.
J Athl Train. 2020 Oct 1;55(10):1116-1123. doi: 10.4085/1062-6050-304-19.
A smaller lumbar multifidus (LM) muscle was reported to be a strong predictor of lower limb injury in professional Australian Football League players. However, despite the high prevalence of low back pain (LBP) and lower limb injury in rugby players, their LM characteristics have yet to be explored.
To (1) examine LM characteristics in male and female university rugby players and their possible associations with LBP and lower limb injury and (2) investigate the relationship between LM characteristics and body composition in this group of athletes.
Cross-sectional study.
University research center.
Thirty-four university rugby players (20 women, 14 men).
MAIN OUTCOME MEASURE(S): Ultrasound measurements of LM cross-sectional area (CSA), thickness, and percentage change in thickness during contraction were obtained bilaterally, at the L5-S1 level, in prone and standing positions. Body composition measures were obtained using dual-energy x-ray absorptiometry. Self-reported questionnaires were used to obtain LBP and lower limb injury history.
Players who reported LBP in the previous 3 months showed a smaller percentage change in thickness during contraction in the standing position (F = 5.21, P = .03). The LM CSA side-to-side asymmetry (right versus left) was greater in players who reported having a lower limb injury in the previous 12 months (F = 4.98, P = .03). The LM CSA was significantly associated with body composition measurements. A greater percentage change in thickness during contraction was significantly associated with a lower percentage of body fat. The LM echo intensity was strongly associated with the total percentage of body fat and was significantly greater in women.
The influence of body composition on LM morphology in athletes cannot be ignored and warrants further investigation. Our findings also provide preliminary evidence of an association among LM morphology, LBP, and lower limb injury in university rugby players.
据报道，腰椎多裂肌（LM）较小是职业澳大利亚足球联盟球员下肢损伤的强预测指标。然而，尽管橄榄球运动员的腰痛（LBP）和下肢损伤发生率很高，但他们的 LM 特征尚未得到探索。
（1）研究男性和女性大学橄榄球运动员的 LM 特征及其与 LBP 和下肢损伤的可能关联，（2）研究该组运动员 LM 特征与身体成分的关系。
横断面研究。
大学研究中心。
34 名大学橄榄球运动员（20 名女性，14 名男性）。
在俯卧位和站立位，在 L5-S1 水平，双侧获得 LM 横截面积（CSA）、厚度和收缩时厚度变化百分比的超声测量值。使用双能 X 射线吸收法测量身体成分。使用自我报告问卷获得 LBP 和下肢损伤史。
在过去 3 个月报告有 LBP 的运动员在站立位时收缩时厚度变化百分比较小（F = 5.21，P =.03）。在过去 12 个月报告下肢损伤的运动员中，LM CSA 的左右侧不对称（右侧与左侧）更大（F = 4.98，P =.03）。LM CSA 与身体成分测量值显著相关。收缩时厚度变化百分比越大，体脂百分比越低。LM 回波强度与总体脂肪百分比密切相关，且在女性中显著更高。
身体成分对运动员 LM 形态的影响不容忽视，值得进一步研究。我们的研究结果还为大学橄榄球运动员中 LM 形态、LBP 和下肢损伤之间的关联提供了初步证据。
