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European Journal of Applied Physiology

, Volume 85, Issue 3–4, pp 351–357 | Cite as

Prolonged stage duration during incremental cycle exercise: effects on the lactate threshold and onset of blood lactate accumulation

  •  D. Bentley
  •  L. McNaughton
  •  A. Batterham
Original Article

Abstract.

The aim of this study was to investigate whether increasing the duration of workloads from 3 min to 8 min during incremental exercise would influence workload (W), oxygen consumption (\(\dot V{\rm O}_{\rm 2} \) ) and heart rate (HR) at the lactate threshold (LT) and the onset of blood lactate accumulation(OBLA). Two groups of six male cyclists were assigned to a well-trained (WT) and recreational (REC) group on the basis of their performance in a maximal incremental ramp test. Each subject then performed two incremental lactate tests (EXT) consisting of six workloads of either 3 min (EXT3-min) or 8 min (EXT8-min) duration. At the completion of each workload whole capillary blood samples were obtained for the determination of blood lactate (BLa) concentration (mM). Power output (Watts, W), HR and \(\dot V{\rm O}_{\rm 2} \) were averaged in the final minute of each workload as well as in the third minute of the EXT8-min. The workload, HR and \(\dot V{\rm O}_{\rm 2} \) at the LT and OBLA were subsequently determined from the data of EXT3-min and EXT8-min. The results demonstrate that workload and \(\dot V{\rm O}_{\rm 2} \) , but not HR, at the LT and OBLA were higher in the WT cyclists. At the same time, the workload at the LT obtained from the results of the EXT3-min was significantly (P<0.05) higher then the value obtained in the EXT8-min in the WT subjects but not the REC subjects. However, the workload, \(\dot V{\rm O}_{\rm 2} \) and HR at the OBLA, together with the \(\dot V{\rm O}_{\rm 2} \) and HR at the LT were not significantly different when calculated from data obtained from EXT3-min or EXT8-min. The data obtained in this study suggest that incremental exercise protocols using workloads of duration longer than 3 min have the effect of increasing the workload at the LT in well-trained cyclists. However, the OBLA determined in exercise tests using stage increments of either 3 min or 8 min is similar in cyclists of different training status.

Adaptation Athletes Blood lactate Incremental exercise Oxygen consumption Workload 

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Copyright information

© Springer-Verlag 2001

Authors and Affiliations

  •  D. Bentley
    • 1
  •  L. McNaughton
    • 1
  •  A. Batterham
    • 1
  1. 1.The Exercise Physiology Laboratory, Department of Sport and Exercise Science, University of Bath, Bath BA2 7AY, UK

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