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The effect of blood flow on tibialis anterior motor unit firing rates during sustained low-intensity isometric contractions.
Applied Physiology, Nutrition, and Metabolism ( IF 3.4 ) Pub Date : 2020-07-10 , DOI: 10.1139/apnm-2020-0437 David B Copithorne 1 , Kalter Hali 1 , Charles L Rice 1, 2
Applied Physiology, Nutrition, and Metabolism ( IF 3.4 ) Pub Date : 2020-07-10 , DOI: 10.1139/apnm-2020-0437 David B Copithorne 1 , Kalter Hali 1 , Charles L Rice 1, 2
Affiliation
Applied Physiology, Nutrition, and Metabolism, Ahead of Print.
Low-intensity contractions with blood flow occlusion (BFO) result in neuromuscular adaptations comparable with high-intensity (>70% maximal voluntary contraction, MVC) exercise. Because BFO exercise can only be applied to limb muscles, it is of interest to explore whether muscles proximal to the occlusion site are affected. Therefore, the purpose of this study was to assess neural activation of the tibialis anterior (TA) when flow is occluded proximal and distal to the active muscle. Five males completed three protocols to observe the effect of BFO on motor unit firing rates (MUFR) of the TA at a fatiguing contraction intensity of ∼15% MVC. Two occlusion protocols, one proximal (BFOprox) to and one distal (BFOdis) to the TA, were compared with a control (free-flow) protocol time-matched to BFOdis. MVC was significantly reduced following the BFOprox (∼41%; P < 0.001) and BFOdis (∼27%, P < 0.001), but not following the control protocol (∼15%; P = 0.13). Surface electromyography (EMG) during BFOdis and BFOprox increased ∼14% and ∼28%, respectively, but was not different among protocols. MUFRs for BFOdis and BFOprox were significantly reduced (by ∼33% and ∼23%, respectively; P < 0.01) at task failure. Results indicate that although BFOprox results in the largest reductions of MUFRs, BFOdis shows greater impairments compared with the free-flow control condition. Novelty Effects on motor unit firing rates of proximal versus distal blood flow occlusion were compared during low-intensity fatiguing task. Proximal occlusion results in greatest fatigue and reduction in motor unit rates, but distal occlusion elicits more fatigue and rate reduction than a control task.
中文翻译：
在持续的低强度等长收缩期间血流对胫骨前运动单位放电率的影响。
应用生理学、营养学和代谢，提前出版。
血流闭塞 (BFO) 的低强度收缩导致神经肌肉适应与高强度（> 70% 最大自愿收缩，MVC）运动相当。由于 BFO 运动只能应用于四肢肌肉，因此探索闭塞部位近端的肌肉是否受到影响是很有趣的。因此，本研究的目的是评估当流动在活动肌肉的近端和远端被阻塞时胫骨前肌 (TA) 的神经激活。五名男性完成了三个协议，以观察 BFO 在疲劳收缩强度为 15% MVC 时对 TA 运动单位放电率 (MUFR) 的影响。两种闭塞协议，一种是近端 (BFOprox) 和一种远端 (BFOdis) 到 TA，与与 BFOdis 时间匹配的对照（自由流动）协议进行了比较。MVC 在 BFOprox (~41%; P < 0.001) 和 BFOdis (~27%, P < 0.001) 后显着降低，但没有遵循对照方案 (~15%; P = 0.13)。BFOdis 和 BFOprox 期间的表面肌电图 (EMG) 分别增加了约 14% 和约 28%，但在不同方案之间没有差异。在任务失败时，BFOdis 和 BFOprox 的 MUFR 显着降低（分别降低了约 33% 和约 23%；P < 0.01）。结果表明，尽管 BFOprox 导致 MUFR 的最大降低，但与自由流动控制条件相比，BFOdis 显示出更大的损害。在低强度疲劳任务期间，比较了近端与远端血流阻塞对运动单位放电率的新颖性影响。近端咬合导致最大的疲劳和运动单位率的降低，
更新日期：2020-07-10
Low-intensity contractions with blood flow occlusion (BFO) result in neuromuscular adaptations comparable with high-intensity (>70% maximal voluntary contraction, MVC) exercise. Because BFO exercise can only be applied to limb muscles, it is of interest to explore whether muscles proximal to the occlusion site are affected. Therefore, the purpose of this study was to assess neural activation of the tibialis anterior (TA) when flow is occluded proximal and distal to the active muscle. Five males completed three protocols to observe the effect of BFO on motor unit firing rates (MUFR) of the TA at a fatiguing contraction intensity of ∼15% MVC. Two occlusion protocols, one proximal (BFOprox) to and one distal (BFOdis) to the TA, were compared with a control (free-flow) protocol time-matched to BFOdis. MVC was significantly reduced following the BFOprox (∼41%; P < 0.001) and BFOdis (∼27%, P < 0.001), but not following the control protocol (∼15%; P = 0.13). Surface electromyography (EMG) during BFOdis and BFOprox increased ∼14% and ∼28%, respectively, but was not different among protocols. MUFRs for BFOdis and BFOprox were significantly reduced (by ∼33% and ∼23%, respectively; P < 0.01) at task failure. Results indicate that although BFOprox results in the largest reductions of MUFRs, BFOdis shows greater impairments compared with the free-flow control condition. Novelty Effects on motor unit firing rates of proximal versus distal blood flow occlusion were compared during low-intensity fatiguing task. Proximal occlusion results in greatest fatigue and reduction in motor unit rates, but distal occlusion elicits more fatigue and rate reduction than a control task.
中文翻译：
在持续的低强度等长收缩期间血流对胫骨前运动单位放电率的影响。
应用生理学、营养学和代谢，提前出版。
血流闭塞 (BFO) 的低强度收缩导致神经肌肉适应与高强度（> 70% 最大自愿收缩，MVC）运动相当。由于 BFO 运动只能应用于四肢肌肉，因此探索闭塞部位近端的肌肉是否受到影响是很有趣的。因此，本研究的目的是评估当流动在活动肌肉的近端和远端被阻塞时胫骨前肌 (TA) 的神经激活。五名男性完成了三个协议，以观察 BFO 在疲劳收缩强度为 15% MVC 时对 TA 运动单位放电率 (MUFR) 的影响。两种闭塞协议，一种是近端 (BFOprox) 和一种远端 (BFOdis) 到 TA，与与 BFOdis 时间匹配的对照（自由流动）协议进行了比较。MVC 在 BFOprox (~41%; P < 0.001) 和 BFOdis (~27%, P < 0.001) 后显着降低，但没有遵循对照方案 (~15%; P = 0.13)。BFOdis 和 BFOprox 期间的表面肌电图 (EMG) 分别增加了约 14% 和约 28%，但在不同方案之间没有差异。在任务失败时，BFOdis 和 BFOprox 的 MUFR 显着降低（分别降低了约 33% 和约 23%；P < 0.01）。结果表明，尽管 BFOprox 导致 MUFR 的最大降低，但与自由流动控制条件相比，BFOdis 显示出更大的损害。在低强度疲劳任务期间，比较了近端与远端血流阻塞对运动单位放电率的新颖性影响。近端咬合导致最大的疲劳和运动单位率的降低，
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