Bishop, David ORCID: 0000-0002-6956-9188, Jenkins, David G and Mackinnon, Laurel T (1998) The relationship between plasma lactate parameters, Wpeak and 1-h cycling performance in women. Medicine and Science in Sports and Exercise , 30 (8). pp. 1270-1275. ISSN 0195-9131 (print) 1530-0315 (online)

Abstract

The relationship between plasma lactate parameters, Wpeak and 1-h cycling performance in women.Med. Sci. Sports Exerc., Vol. 30, No. 8, pp. 1270-1275, 1998. Purpose: The relationship between six descriptors of lactate increase, peak V·O2, Wpeak, and 1-h cycling performance were compared in 24 trained, female cyclists (peak V·O2= 48.11 ± 6.32 mL·kg-1·min-1). Methods: The six descriptors of lactate increase were: 1) lactate threshold (LT; the power output at which plasma lactate concentration begins to increase above the resting level during an incremental exercise test), 2) LT1 (the power output at which plasma lactate increases by 1 mM or more), 3) LTD (the lactate threshold calculated by the D-max method), 4) LTMOD (the lactate threshold calculated by a modified D-max method), 5) L4 (the power output at which plasma lactate reaches a concentration of 4 mmol·L-1), and 6) LTLOG (the power output at which plasma lactate concentration begins to increase when the log([La-]) is plotted against the log (power output)). Subjects first completed a peak V·O2 test on a cycle ergometer. Finger-tip capillary blood was sampled within 30 s of the end of each 3-min stage for analysis of plasma lactate. Endurance performance was assessed 7 d later using a 1-h cycle test (OHT) in which subjects were directed to achieve the highest possible average power output. Results: The mean power output (W) for the OHT (± SD) was 183.01 ± 18.88, and for each lactate variable was: LT (138.54 ± 46.61), LT1 (179.17 ± 27.25), LTLOG (143.97 ± 45.74), L4 (198.09 ± 33.84), LTD(178.79 ± 24.07), LTMOD (212.28 ± 31.75). Average power output during the OHT was more strongly correlated with all plasma lactate parameters (0.61< r < 0.84) and Wpeak (r = 0.81) than with peak V·O2 (r = 0.55). The six lactate parameters were strongly correlated with each other (0.54< r < 0.91) and of the six lactate parameters, LTD correlated best with endurance performance (r = 0.84). Conclusions: It was concluded that plasma lactate parameters and Wpeak provide better indices of endurance performance than peak V·O2 and that, of the six descriptors of lactate increase measured in this study, LTD is most strongly related to 1-h cycling performance in trained, female cyclists.

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