Exercise and Health Research Group, Sport, Health and Performance Enhancement (SHAPE) Research Centre, School of Science and Technology, Nottingham Trent University, Nottingham, UNITED KINGDOM.
Med Sci Sports Exerc. 2020 Nov;52(11):2402-2411. doi: 10.1249/MSS.0000000000002395.
Prior upper body exercise reduces the curvature constant (W') of the hyperbolic power-duration relationship without affecting critical power. This study tested the hypothesis that prior upper body exercise reduces the work done over the end-test power (WEP; analog of W') during a 3-min all-out cycling test (3MT) without affecting the end-test power (EP; analog of critical power).
Ten endurance-trained men (V˙O2max = 62 ± 5 mL·kg·min) performed a 3MT without (CYC) and with (ARM-CYC) prior severe-intensity, intermittent upper body exercise. EP was calculated as the mean power output over the last 30 s of the 3MT, whereas WEP was calculated as the power-time integral above EP.
At the start of the 3MT, plasma [La] (1.8 ± 0.4 vs 14.1 ± 3.4 mmol·L) and [H] (42.8 ± 3.1 vs 58.6 ± 5.5 nmol·L) were higher, whereas the strong ion difference (41.4 ± 2.2 vs 30.9 ± 4.6 mmol·L) and [HCO3] (27.0 ± 1.9 vs 16.9 ± 3.2 mmol·L) were lower during ARM-CYC than CYC (P < 0.010). EP was 12% lower during the 3MT of ARM-CYC (298 ± 52 W) than CYC (338 ± 60 W; P < 0.001), whereas WEP was not different (CYC: 12.8 ± 3.3 kJ vs ARM-CYC: 13.5 ± 4.1 kJ, P = 0.312). EP in CYC was positively correlated with the peak [H] (r = 0.78, P = 0008) and negatively correlated with the lowest [HCO3] (r = -0.74, P = 0.015).
These results suggest that EP during a 3MT in endurance-trained men is sensitive to fatigue-related ionic perturbation.
先前的上半身运动可降低双曲幂时关系的曲率常数（W'），而不影响关键功率。本研究检验了这样一个假设，即先前的上半身运动可降低 3 分钟全力自行车测试（3MT）中末端测试功率（WEP；W'的模拟值）所做的功，而不影响末端测试功率（EP；关键功率的模拟值）。
10 名耐力训练的男性（V˙O2max = 62 ± 5 mL·kg·min）进行了 3MT，无（CYC）和有（ARM-CYC）先前的剧烈强度间歇性上半身运动。EP 计算为 3MT 最后 30 s 的平均功率输出，而 WEP 计算为 EP 以上的功率时间积分。
在 3MT 开始时，血浆 [La]（1.8 ± 0.4 vs 14.1 ± 3.4 mmol·L）和 [H]（42.8 ± 3.1 vs 58.6 ± 5.5 nmol·L）更高，而强离子差（41.4 ± 2.2 vs 30.9 ± 4.6 mmol·L）和 [HCO3]（27.0 ± 1.9 vs 16.9 ± 3.2 mmol·L）在 ARM-CYC 时较低（P < 0.010）。在 3MT 期间，EP 在 ARM-CYC 时降低了 12%（298 ± 52 W），而 CYC 时（338 ± 60 W；P < 0.001），而 WEP 没有差异（CYC：12.8 ± 3.3 kJ vs ARM-CYC：13.5 ± 4.1 kJ，P = 0.312）。在 CYC 中，EP 与峰值 [H]（r = 0.78，P = 0008）呈正相关，与最低 [HCO3]（r = -0.74，P = 0.015）呈负相关。
这些结果表明，在耐力训练的男性中，3MT 期间的 EP 对与疲劳相关的离子扰动敏感。
