Validity of Common Approaches to Determining the Exercise Intensity at Maximal Oxygen Uptake

摘要

Merry KL. Validity of Common Approaches to Determiningthe Exercise Intensity at Maximal Oxygen Uptake. JEPonline2020;23(2):18-28. This study compared 5 common methodsused to determine exercise intensity at V̇ O2 max (iV̇ O2 max)with an iV̇ O2 max value refined to its minimum value (iV̇ O2max(R)). This study ascertained which method estimated therefined value most accurately for the purpose of settinginterval training intensities. Fifteen male cyclists (age 34 ± 8yrs, body mass 80.9 ± 10.2 kg, height 1.82 ± 0.05 m; V̇ O2 max4.43 ± 0.49 L∙min-1) performed three maximal incrementaltests for the determination of iV̇ O2 max(R). iV̇ O2 max was alsodetermined during each test as: (a) the intensity determinedby extrapolation of the submaximal intensity-V̇ O2 relationship(Method 1); (b) the minimum intensity at which V̇ O2 max wasattained (Method 2); (c) the ratio of V̇ O2 max to the oxygencost of submaximal exercise (C) (Method 3); (d) the ratio of(V̇ O2 max – V̇ O2 at rest) to (C – V̇ O2 at rest) (Method 4); and(e) the highest intensity sustained for 3 min (Method 5).Methods 1, 2, and 4 produced iV̇ O2 max values that were notsignificantly different from iV̇ O2 max(R) (P<0.05). The iV̇ O2max values of Method 3 (P = 0.01) and Method 5 (P = 0.04)were significantly greater than iV̇ O2 max(R). Methods 1, 2,and 4 provide good estimates of the minimum exerciseintensity at which V̇ O2 max is elicited and therefore may beuseful when setting interval training intensities. In contrast,methods 3 and 5 appear to overestimate iV̇ O2 max.