Ducas Julien, Pano-Rodriguez Alvaro, Vadez Guillaume, Abboud Jacques
Department of Human Kinetics, Université du Québec À Trois-Rivières, 3351, Boul. Des Forges, Trois-Rivières, Québec, G8Z 4M3, Canada.
Groupe de Recherche Sur Les Affections Neuromusculosquelettiques (GRAN), Université du Québec À Trois-Rivières, Trois-Rivières, Québec, Canada.
Eur J Appl Physiol. 2025 May;125(5):1323-1336. doi: 10.1007/s00421-024-05678-x. Epub 2024 Dec 11.
This study aimed to investigate whether lumbar delayed-onset muscle soreness (DOMS) impacts the magnitude of the flexion relaxation phenomenon regionally.
Eighteen adult participants (9 men and 9 women) performed flexion extension movement under two conditions (with and without DOMS). Lumbar muscle activation strategies were recorded using high-density surface electromyography (HDsEMG) on both sides of the trunk. To determine the spatial distribution of flexion relaxation phenomenon, flexion relaxation ratio of muscle activity was computed for all electrodes of the HDsEMG grid and the coordinates of the centroid (average position of flexion relaxation ratio across the HDsEMG grid) in the mediolateral and craniocaudal axis were calculated.
The results revealed a cranial shift (~ 6 mm) of flexion relaxation phenomenon within the lumbar extensor muscles when DOMS was present (both sides: p < 0.05), possibly attributed to the increased recruitment of lumbar stabilizing muscles located caudally, which may serve as a guarding mechanism to pain.
These results highlight the importance of evaluating the entire lumbar region when assessing the flexion relaxation phenomenon.
本研究旨在调查腰椎延迟性肌肉酸痛（DOMS）是否会局部影响屈曲放松现象的程度。
18名成年参与者（9名男性和9名女性）在两种条件下（有和没有DOMS）进行屈伸运动。使用高密度表面肌电图（HDsEMG）记录躯干两侧的腰椎肌肉激活策略。为了确定屈曲放松现象的空间分布，计算HDsEMG网格所有电极的肌肉活动屈曲放松率，并计算在内外侧和头尾轴上质心的坐标（HDsEMG网格上屈曲放松率的平均位置）。
结果显示，当存在DOMS时，腰椎伸肌内的屈曲放松现象有头侧移位（约6毫米）（双侧：p<0.05），这可能归因于尾侧腰椎稳定肌募集增加，这可能是一种对疼痛的保护机制。
这些结果突出了在评估屈曲放松现象时评估整个腰椎区域的重要性。
