Neuromuscular Assessment Laboratory, Physical Education School, Federal University of Pelotas, Pelotas, RS, BRAZIL.
Medical School, Federal University of Rio Grande, Rio Grande, RS, BRAZIL.
Med Sci Sports Exerc. 2021 Jul 1;53(7):1452-1459. doi: 10.1249/MSS.0000000000002598.
The present cross-sectional study aimed to investigate whether a maximal oxygen uptake (V˙O2max) verification phase (VER) could improve the accuracy of a previous graded exercise test (GXT) to assess individual V˙O2max in hypertensive individuals.
Thirty-three older adults with hypertension (24 women) taking part in the Hypertension Approaches in the Elderly Study (NCT03264443) were recruited. Briefly, after performing a treadmill GXT to exhaustion, participants rested for 10 min and underwent a multistage VER to confirm GXT results. Individual V˙O2max, RER, maximal heart rate (HRmax), and RPE were measured during both GXT and VER tests. Mean values were compared between bouts using paired sample t-tests, and V˙O2max was also compared between GXT and VER on an individual basis.
Testing was well tolerated by all participants. Both absolute (P = 0.011) and relative (P = 0.014) V˙O2max values were higher in VER than that in GXT. RER (P < 0.001) and RPE (P = 0.002) were lower in VER, whereas HRmax (P = 0.286) was not different between the two trials. Individual V˙O2max comparisons revealed that 54.6% of the participants (18/33) achieved a V˙O2max value that was ≥3% during VER (mean = 13.5%, range = +3% to +22.1%, ES = 0.062), whereas 87.9% (29/33) of the tests would have been validated as a maximal effort if the classic criteria were used (i.e., V̇O2 plateau or at least two secondary criteria).
In sedentary older individuals with hypertension, GXT to exhaustion underestimated V˙O2max in more than half of tested participants, even when established, but criticized criteria were used to confirm whether a maximal effort was attained. Using VER after GXT is a quick approach to assist with the verification of an individual's V˙O2max.
本横断面研究旨在探讨最大摄氧量（V˙O2max）验证阶段（VER）是否能提高先前分级运动试验（GXT）评估高血压个体 V˙O2max 的准确性。
共招募了 33 名参加高血压老年人研究（NCT03264443）的高血压老年患者（24 名女性）。简要地，参与者在进行跑步机 GXT 至力竭后休息 10 分钟，并进行多阶段 VER 以确认 GXT 结果。个体 V˙O2max、呼吸商（RER）、最大心率（HRmax）和 RPE 在 GXT 和 VER 测试中均进行测量。使用配对样本 t 检验比较两个测试阶段的平均值，并对 GXT 和 VER 个体的 V˙O2max 进行比较。
所有参与者均能很好地耐受测试。VER 中的绝对（P = 0.011）和相对（P = 0.014）V˙O2max 值均高于 GXT。VER 中的 RER（P < 0.001）和 RPE（P = 0.002）均低于 GXT，而两个试验之间的 HRmax 无差异（P = 0.286）。个体 V˙O2max 比较显示，54.6%（18/33）的参与者（18/33）在 VER 中达到≥3%的 V˙O2max 值（平均值= 13.5%，范围=+3%至+22.1%，ES = 0.062），而如果使用经典标准（即 V̇O2 平台或至少两个次要标准），则 87.9%（29/33）的测试将被验证为最大努力。
在久坐的高血压老年患者中，即使使用已建立但受到批评的标准来确认是否达到最大努力，GXT 至力竭也会使超过一半的测试参与者的 V˙O2max 被低估。在 GXT 后使用 VER 是一种快速的方法来帮助验证个体的 V˙O2max。
