当前位置: X-MOL 学术Respir. Physiol. Neurobiol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Influence of muscular contraction on vascular conductance during exercise above versus below critical power
Respiratory Physiology & Neurobiology ( IF 2.3 ) Pub Date : 2021-06-11 , DOI: 10.1016/j.resp.2021.103718
Shane M Hammer 1 , Stephen T Hammond 2 , Shannon K Parr 2 , Andrew M Alexander 2 , Vanessa-Rose G Turpin 2 , Zachary J White 2 , Kaylin D Didier 2 , Joshua R Smith 1 , Thomas J Barstow 2 , Carl J Ade 2
Affiliation  

We tested the hypothesis that limb vascular conductance (LVC) would increase during the immediate recovery phase of dynamic exercise above, but not below, critical power (CP) indicating a threshold for muscular contraction-induced impedance of limb blood flow (LBF). CP (115 ± 26 W) was determined in 7 men and 7 women who subsequently performed ∼5 min of near-supine cycling exercise both below and above CP. LVC demonstrated a greater increase during immediate recovery and remained significantly higher following exercise above, compared to below, CP (all p < 0.001). Power output was associated with the immediate increases in LVC following exercise above, but not below, CP (p < 0.001; r = 0.85). Additionally, variance in percent LBF impedance was significantly lower above (CV: 10.7 %), compared to below (CV: 53.2 %), CP (p < 0.01). CP appears to represent a threshold above which the characteristics of LBF impedance by muscular contraction become intensity-dependent. These data suggest a critical level of LBF impedance relative to contraction intensity exists and, once attained, may promote the progressive metabolic and neuromuscular responses known to occur above CP.



中文翻译:

在高于和低于临界功率的运动中肌肉收缩对血管电导的影响

我们检验了以下假设:在动态运动的立即恢复阶段,肢体血管电导 (LVC) 会增加,但不低于临界功率 (CP),表明肌肉收缩诱导的肢体血流阻抗 (LBF) 的阈值。在 7 名男性和 7 名女性中测定了 CP (115 ± 26 W),他们随后在 CP 下方和上方进行了约 5 分钟的近仰卧自行车运动。与下面的 CP 相比,LVC 在立即恢复期间表现出更大的增加,并且在上面的运动后仍然显着更高(所有 p < 0.001)。功率输出与上述运动后 LVC 的立即增加有关,但不低于 CP(p < 0.001;r = 0.85)。此外,与低于 (CV: 53.2 %) CP (p < 0.01) 相比,LBF 阻抗百分比的变化显着低于 (CV: 10.7 %)。CP 似乎代表了一个阈值,在该阈值之上,肌肉收缩引起的 LBF 阻抗特性变得依赖于强度。这些数据表明存在与收缩强度相关的临界水平的 LBF 阻抗,一旦达到,可能会促进已知发生在 CP 以上的进行性代谢和神经肌肉反应。

更新日期:2021-06-15
down
wechat
bug