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Anaerobic threshold and maximal aerobic power for three modes of exercise
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1976
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Respiratory gas exchange parameters have been proposed as sensitive, noninvasive indices of the anaerobic threshold during incremental exercise. The study aimed to assess the validity and feasibility of detecting the anaerobic threshold using routine gas‑exchange measures and to compare anaerobic threshold and VO₂max across arm cranking, leg cycling, and treadmill walk‑running in 30 male college students. Researchers performed double determinations of anaerobic threshold and VO₂max for each of the three exercise modes in 30 college‑age male volunteers. AT occurred at 46.5 % VO₂max for arm cranking, 63.8 % for leg cycling, and 58.6 % for treadmill walk‑running, with no difference between leg modes but significant differences versus arm, and a strong correlation (r = 0.95) between gas‑exchange and lactate‑derived AT, confirming the gas‑exchange method as a valid indirect marker of lactic acidosis during incremental exercise.
Alterations in selected respiratory gas exchange parameters have been proposed as sensitive, noninvasive indices of the onset of metabolic acidosis(anaerobic threshold (AT) during incremental exercise. Our purposes were toinvestigate the validity and feasibility of AT detection using routine laboratory measures of gas exchange, i.e., nonlinear increases in VE and VCO2 and abrupt increases in FEO2. Additionally, we examined the comparability ofthe AT and VO2 max among three modes of exercise (arm cranking, leg cycling, and treadmill walk-running) with double determinations obtained from 30 college-age, male volunteer subjects. The AT's for arm cranking, leg cycling, and treadmill walk-running occurred at 46.5 +/- 8.9 (means +/- SD), 63.8 +/- 9.0, and 58.6 +/- 5.8% of VO2 max, respectively. No significant difference was found between the leg exercise modes (cycling and walk-running) forthe AT while all pairwise arm versus leg comparisons were significantly different. Using nine additional subjects performing leg cycling tests, a significant correlation of r = 0.95 was found between gas exchange AT measurements (expressed as % VO2 max) and venous blood lactate AT measurements (% VO2 max). We conclude that the gas exchange AT is a valid and valuable indirect method for the detection of the development of lactic acidosis during incremental exercise.