Noninvasive estimation of the lactate threshold in a subject with dissociated ventilatory and pulmonary gas exchange indices: a case report.
This case report describes the responses to incremental work-rate exercise in a healthy subject (with normal pulmonary function), for whom the pulmonary gas exchange (V-slope) and ventilatory-related indexes (ie, ventilatory equivalents and end-tidal partial pressures for O2 and CO2) uncharacteristically do not occur at the same metabolic rate. Based on the results of additional constant-work-rate exercise tests, we propose that in the (occasional) event of such a dissociation between the V-slope and ventilatory-related responses normally associated with the lactate threshold (theta L), then the V-slope index should take priority as the theta L estimator.
Whipp
Brian J
BJ
Institute of Membrane and Systems Biology, University of Leeds, Worsley Building, Level 9, Leeds LS2 9JT, UK. b.whipp@leeds.ac.uk
Agostoni
Piergiuseppe
P
D000328:Adult; D002245:Carbon Dioxide / Q000378:metabolism*; D005080:Exercise Test; D006801:Humans; D007773:Lactates / Q000097:blood*; D008297:Male; D010100:Oxygen / Q000378:metabolism*; D011659:Pulmonary Gas Exchange / Q000502:physiology*; D012129:Respiratory Function Tests
D007773:Lactates; D002245:Carbon Dioxide; D010100:Oxygen