Useful exercise protocol and method of evaluation for determining gas exchange threshold (VOA).
- VernacularTitle:換気性作業しきい値（ＶＯＡ：Ａ＝２｀ＧＥＴ´）の算出に適した運動負荷法およびＧＥＴ判定法に関する研究
- Author:
MASASHI KAMIOKA
;
HAJIME ITO
;
MASATO SUZUKI
- Publication Type:Journal Article
- Keywords:
gas exchange threshold;
maximal oxygen uptake;
RAMP cycle ergometer test;
STEP cycle ergometer test;
incremental exhaustive exercise
- From:Japanese Journal of Physical Fitness and Sports Medicine
2000;49(3):393-401
- CountryJapan
- Language:Japanese
-
Abstract:
The purpose of the present study was to investigate a useful exercise protocol and method of evaluation for determining the gas exchange threshold (VO2GET) and correlation coefficient between VO2GET and maximal oxygen uptake (VO2max), which is an index of aerobic capacity. Five healthy male volunteers (age: 25.6 ± 2.0 yrs; height: 172.9±4.0 cm; weight: 69.5±6.6 kg) performed exercise tests 82 times. Each volunteer randomly conducted a RAMP exercise (1 W⋅3 sec-1), STEP-1 exercise (20W⋅min-1) and STEP-2 exercise (40W⋅2 min-1), respectively, at least 4 to 8 rotations. The gas exchange parameters (VE, VO2and VCO2) for incremental exhaustive cycle ergometer exercise were measured using a“breath-by-breath”method. Three different methods of evaluation- (VE/VO2and VE/VCO2) exchange (M-1), V-slope method (M-2), and M-1 & M-2 (M-3) -were attempted to determine VO2GET. The VO2GET values, determined by three different methods (M-1, -2 and -3) of evaluation, were classified as‘easy’ (J-A) and‘difficult’ (J-B) in all tests. Reproducibility of VO2max and VO2GET were assessed using the coefficient of variation (CV) and correlation coefficients (r) between VO2max and VO2GET.
The results are summarized as follows:
1) The means of the reproducibility of VO2max were determined among the 5 subjects by us ing RAMP, 4.8% (n=25), STEP-1, 3.1% (n=28) and STEP-2, 2.9% (n=29) exercise tests; STEP-2 exercise test values (CV) were lower than the others. There was no significant difference in the means of VO2max among the 5 subjects according to the RAMP and two STEP exercise tests (Two-way ANOVA) .
2) The best reproducibility value of VO2GET among the 5 subjects was determined using RAMP exercise tests with the V-slope method (M-2) and evaluations were classified as easy (J-A) . The value (CV) was 2.8%. There was no significant difference in the VO2GET values (M-1 (J-A, -B), M-2 (J-A, -B) and M-3) (Two-way ANOVA) and their means among the 5 subjects concerning RAMP and two STEP exercise tests (Two-way ANOVA) .
3) The best correlation coefficient (r) value between VO2max and VO2GET was obtained using RAMP exercise tests with M-2 (J-A) (r=0.976, n=20) .
The present results indicate that the most useful exercise protocol and method of evaluation for determining VO2GET is the RAMP exercise test with the V-slope method.
