Shenoy S, Balachander H, Sandhu J S
Faculty of Sports Medicine and Physiotherapy, Guru Nanak Dev University, Amritsar, Punjab, India.
J Back Musculoskelet Rehabil. 2013;26(4):445-50. doi: 10.3233/BMR-130404.
Incidence of Low Back Pain (LBP) in athletes is as high as 30%. Patients with LBP show altered postural and neuromuscular responses to various functional tasks. The objective of the study was to compare long latency reflex response (occurring between 40 to ∼ 100 ms duration) in athletes with chronic LBP with asymptomatic athletes.
Surface electromyography (EMG) of superficial trunk muscles - Rectus Abdominis (RA) and Erector Spinae (ES) were studied in athletes with chronic LBP (n=24) and asymptomatic athletes (n=25). Perturbations were introduced in standing both expectedly and unexpectedly. The latency of onset and the Root Mean Square (RMS) amplitudes within the reaction duration were compared between the two groups.
The latency of onset was delayed in Unexpected perturbations but no change was observed in Expected tasks. The mean RMS amplitudes were significantly lower in both tasks for RA and in the Expected task for ES (p< 0.05).
Chronic LBP athletes exhibit a delay in onset latency to Unexpected perturbations and reduced long latency response amplitudes to perturbation tasks compared to asymptomatic athletes. These changes could predispose athletes to recurrent low back pain and further injury.
运动员中腰痛（LBP）的发生率高达30%。腰痛患者在进行各种功能任务时，其姿势和神经肌肉反应会发生改变。本研究的目的是比较慢性腰痛运动员与无症状运动员的长潜伏期反射反应（持续时间在40至约100毫秒之间）。
对慢性腰痛运动员（n = 24）和无症状运动员（n = 25）的浅表躯干肌肉——腹直肌（RA）和竖脊肌（ES）进行表面肌电图（EMG）研究。在站立状态下，分别进行预期和意外的扰动。比较两组之间反应持续时间内的起始潜伏期和均方根（RMS）振幅。
在意外扰动中，起始潜伏期延迟，但在预期任务中未观察到变化。RA在两项任务中的平均RMS振幅均显著降低，ES在预期任务中的平均RMS振幅也显著降低（p < 0.05）。
与无症状运动员相比，慢性腰痛运动员在面对意外扰动时起始潜伏期延迟，对扰动任务的长潜伏期反应振幅降低。这些变化可能使运动员易患复发性腰痛和进一步受伤。
