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PLoS One. 2014 Jan 14;9(1):e85276. doi: 10.1371/journal.pone.0085276. eCollection 2014.

End criteria for reaching maximal oxygen uptake must be strict and adjusted to sex and age: a cross-sectional study.

Author information

1
Norwegian School of Sport Sciences, Department of Sports Medicine, Oslo, Norway ; Oslo University Hospital, Ullevål, Department of Pulmonary Medicine, Oslo, Norway.
2
Norwegian School of Sport Sciences, Department of Sports Medicine, Oslo, Norway.

Abstract

OBJECTIVE:

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.

METHODS:

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.

RESULTS:

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.

CONCLUSIONS:

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.

PMID:
24454832
PMCID:
PMC3891752
DOI:
10.1371/journal.pone.0085276
[Indexed for MEDLINE]
Free PMC Article

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