健康成年人在血流受限与非受限的等努力抗阻运动中肌肉活动和痛觉迟钝的比较。
Muscle activity and hypoalgesia in blood flow restricted versus unrestricted effort-matched resistance exercise in healthy adults.
机构信息
Department of Physical Therapy, New York University, New York, New York, USA.
Department of Electrical and Computer Engineering, New York University (NYU), New York, New York, USA.
出版信息
Physiol Rep. 2024 Jul;12(14):e16037. doi: 10.14814/phy2.16037.
This study assessed muscle activity (root mean square, RMS, and median frequency, MDF) to evaluate the acute response to blood flow restriction (BFR) resistance exercise (RE) and conventional moderate intensity (MI) RE. We also performed exploratory analyses of differences based on sex and exercise-induced hypoalgesia (EIH). Fourteen asymptomatic individuals performed four sets of unilateral leg press with their dominant leg to volitional fatigue under two exercise conditions: BFR RE and MI RE. Dominant side rectus femoris (RF) and vastus lateralis (VL) muscle activity were measured using surface electromyography (sEMG) through exercise. RMS and MDF were calculated and compared between conditions and timepoints using a linear mixed model. Pressure pain thresholds (PPT) were tested before and immediately after exercise and used to quantify EIH. Participants were then divided into EIH responders and nonresponders, and the differences on RMS and MDF were compared between the two groups using Hedges' g. RMS significantly increased over time (RF: p = 0.0039; VL: p = 0.001) but not between conditions (RF: p = 0.4; VL: p = 0.67). MDF decreased over time (RF: p = 0.042; VL: p < 0.001) but not between conditions (RF: p = 0.74; VL: p = 0.77). Consistently lower muscle activation was found in females compared with males (BRF, RF: g = 0.63; VL, g = 0.5. MI, RF: g = 0.72; VL: g = 1.56), with more heterogeneous findings in MDF changes. For BFR, EIH responders showed greater RMS changes (Δ RMS) (RF: g = 0.90; VL: g = 1.21) but similar MDF changes (Δ MDF) (RF: g = 0.45; VL: g = 0.28) compared to nonresponders. For MI, EIH responders demonstrated greater increase on Δ RMS (g = 0.61) and decrease on Δ MDF (g = 0.68) in RF but similar changes in VL (Δ RMS: g = 0.40; Δ MDF: g = 0.39). These results indicate that when exercising to fatigue, no statistically significant difference was observed between BFR RE and conventional MI RE in Δ RMS and Δ MDF. Lower muscle activity was noticed in females. While exercising to volitional fatigue, muscle activity may contribute to EIH.
本研究评估了肌肉活动（均方根，RMS 和中值频率，MDF），以评估血流限制（BFR）阻力运动（RE）和传统中等强度（MI）RE 的急性反应。我们还根据性别和运动引起的痛觉减退（EIH）进行了探索性分析。14 名无症状个体在两条腿的主导腿上进行了四组单侧腿推运动，直至达到自愿疲劳状态，两条腿分别在两种运动条件下进行：BFR RE 和 MI RE。通过运动中的表面肌电图（sEMG）测量主导侧股直肌（RF）和股外侧肌（VL）的肌肉活动。使用线性混合模型比较条件和时间点之间的 RMS 和 MDF 并进行计算。在运动前后测试压力疼痛阈值（PPT），以量化 EIH。参与者随后分为 EIH 反应者和非反应者，使用 Hedge's g 比较两组之间 RMS 和 MDF 的差异。RMS 随时间显著增加（RF：p=0.0039；VL：p=0.001），但不受条件影响（RF：p=0.4；VL：p=0.67）。MDF 随时间降低（RF：p=0.042；VL：p<0.001），但不受条件影响（RF：p=0.74；VL：p=0.77）。与男性相比，女性的肌肉激活度始终较低（BRF，RF：g=0.63；VL，g=0.5.MI，RF：g=0.72；VL：g=1.56），MDF 变化的结果更为复杂。对于 BFR，EIH 反应者的 RMS 变化（Δ RMS）更大（RF：g=0.90；VL：g=1.21），但非反应者的 MDF 变化（Δ MDF）相似（RF：g=0.45；VL：g=0.28）。对于 MI，EIH 反应者在 RF 中表现出更大的 RMS 增加（Δ RMS）（g=0.61）和 MDF 减少（Δ MDF）（g=0.68），而 VL 中的变化相似（Δ RMS：g=0.40；Δ MDF：g=0.39）。这些结果表明，当运动至疲劳时，BFR RE 和传统 MI RE 在 RMS 和 MDF 方面没有观察到统计学上的显著差异。女性的肌肉活动较低。在运动至自愿疲劳时，肌肉活动可能有助于 EIH。
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