Norwegian School of Sport Sciences, Department of Sports Medicine, Oslo, Norway ; Oslo University Hospital, Ullevål, Department of Pulmonary Medicine, Oslo, Norway.
Norwegian School of Sport Sciences, Department of Sports Medicine, Oslo, Norway.
PLoS One. 2014 Jan 14;9(1):e85276. doi: 10.1371/journal.pone.0085276. eCollection 2014.
To describe different end criteria for reaching maximal oxygen uptake (VO2max) during a continuous graded exercise test on the treadmill, and to explore the manner by which different end criteria have an impact on the magnitude of the VO2max result.
A sample of 861 individuals (390 women) aged 20-85 years performed an exercise test on a treadmill until exhaustion. Gas exchange, heart rate, blood lactate concentration and Borg Scale6-20 rating were measured, and the impact of different end criteria on VO2max was studied;VO2 leveling off, maximal heart rate (HRmax), different levels of respiratory exchange ratio (RER), and postexercise blood lactate concentration.
Eight hundred and four healthy participants (93%) fulfilled the exercise test until voluntary exhaustion. There were no sex-related differences in HRmax, RER, or Borg Scale rating, whereas blood lactate concentration was 18% lower in women (P<0.001). Forty-two percent of the participants achieved a plateau in VO2; these individuals had 5% higher ventilation (P = 0.033), 4% higher RER (P<0.001), and 5% higher blood lactate concentration (P = 0.047) compared with participants who did not reach a VO2 plateau. When using RER ≥1.15 or blood lactate concentration ≥8.0 mmol•L(-1), VO2max was 4% (P = 0.012) and 10% greater (P<0.001), respectively. A blood lactate concentration ≥8.0 mmol•L(-1) excluded 63% of the participants in the 50-85-year-old cohort.
A range of typical end criteria are presented in a random sample of subjects aged 20-85 years. The choice of end criteria will have an impact on the number of the participants as well as the VO2max outcome. Suggestions for new recommendations are given.
描述在跑步机上进行连续递增负荷运动试验时达到最大摄氧量（VO2max）的不同终止标准，并探讨不同终止标准对 VO2max 结果的影响方式。
861 名（390 名女性）年龄在 20-85 岁的个体在跑步机上进行运动试验直至力竭。测量气体交换、心率、血乳酸浓度和 Borg 量表 6-20 评分，并研究不同终止标准对 VO2max 的影响；VO2 稳定、最大心率（HRmax）、不同水平的呼吸交换率（RER）和运动后血乳酸浓度。
804 名健康参与者（93%）完成了直至自愿力竭的运动试验。HRmax、RER 或 Borg 量表评分在性别之间没有差异，而女性的血乳酸浓度低 18%（P<0.001）。42%的参与者达到 VO2 平台；这些人通气量增加 5%（P=0.033），RER 增加 4%（P<0.001），血乳酸浓度增加 5%（P=0.047），与未达到 VO2 平台的参与者相比。当使用 RER≥1.15 或血乳酸浓度≥8.0mmol•L(-1)时，VO2max 分别增加 4%（P=0.012）和 10%（P<0.001）。血乳酸浓度≥8.0mmol•L(-1)排除了 50-85 岁年龄组 63%的参与者。
在 20-85 岁的随机样本中提出了一系列典型的终止标准。终止标准的选择将对参与者数量和 VO2max 结果产生影响。给出了新建议的建议。
