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. 2021 Jul 1;53(7):1482-1494. doi: 10.1249/MSS.0000000000002608.
The ergogenic effects of respiratory alkalosis induced by prior voluntary hyperventilation (VH) are controversial. This study examined the effects of prior VH on derived parameters from the 3-min all-out cycling test (3MT).
Eleven men ( = 46 ± 8 mL·kg-1·min-1) performed a 3MT preceded by 15 min of rest (CONT) or VH ( = 38 ± 5 L·min-1) with PETCO2 reduced to 21 ± 1 mm Hg (HYP). End-test power (EP; synonymous with critical power) was calculated as the mean power output over the last 30 s of the 3MT, and the work done above EP (WEP; synonymous with W') was calculated as the power-time integral above EP.
At the start of the 3MT, capillary blood PCO2 and [H+] were lower in HYP (25.2 ± 3.0 mm Hg, 27.1 ± 2.6 nmol·L-1) than CONT (43.2 ± 2.0 mm Hg, 40.0 ± 1.5 nmol·L-1) (P < 0.001). At the end of the 3MT, blood PCO2 was still lower in HYP (35.7 ± 5.4 mm Hg) than CONT (40.6 ± 5.0 mm Hg) (P < 0.001). WEP was 10% higher in HYP (19.4 ± 7.0 kJ) than CONT (17.6 ± 6.4 kJ) (P = 0.006), whereas EP was 5% lower in HYP (246 ± 69 W) than CONT (260 ± 74 W) (P = 0.007). The ΔWEP (J·kg-1) between CONT and HYP correlated positively with the PCO2 immediately before the 3MT in HYP (r = 0.77, P = 0.006).
These findings suggest that acid-base changes elicited by prior VH increase WEP but decrease EP during the all-out 3MT.
先前自愿性过度通气（VH）引起的呼吸性碱中毒的能量增益效应存在争议。本研究检测了先前 VH 对 3 分钟全力自行车测试（3MT）衍生参数的影响。
11 名男性（=46±8 mL·kg-1·min-1）在休息 15 分钟后（CONT）或 VH（=38±5 L·min-1）进行 3MT，其中 PETCO2 降低至 21±1 mm Hg（HYP）。终末测试功率（EP；与临界功率同义）被计算为 3MT 最后 30 秒的平均功率输出，而高于 EP 的做功（WEP；与 W'同义）被计算为高于 EP 的功率时间积分。
在 3MT 开始时，HYP（25.2±3.0 mm Hg，27.1±2.6 nmol·L-1）的毛细血管血 PCO2 和 [H+] 低于 CONT（43.2±2.0 mm Hg，40.0±1.5 nmol·L-1）（P<0.001）。在 3MT 结束时，HYP 的血液 PCO2 仍低于 CONT（35.7±5.4 mm Hg）（P<0.001）。HYP 的 WEP 比 CONT 高 10%（19.4±7.0 kJ）（P=0.006），而 EP 则低 5%（246±69 W）（P=0.007）。CONT 和 HYP 之间的ΔWEP（J·kg-1）与 HYP 中 3MT 前的 PCO2 呈正相关（r=0.77，P=0.006）。
这些发现表明，先前 VH 引起的酸碱变化增加了 3MT 中的 WEP，但降低了 EP。
