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The bloodless lactate profile

C Foster1, M P Crowe, D Holum

  • 1Milwaukee Heart Institute, WI 53201-0342, USA.

Medicine and Science in Sports and Exercise
|June 1, 1995
PubMed
Summary
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Blood lactate profiling (HLa-P) can be replaced by relative velocity or %HRmax for training intensity. These methods accurately predict steady-state exercise intensity in speed skaters without blood draws.

Area of Science:

  • Sports Science
  • Exercise Physiology
  • Biochemistry

Background:

  • Blood lactate profiling (HLa-P) is a standard method for assessing athlete performance and prescribing training intensity.
  • However, HLa-P presents logistical and public health challenges, necessitating alternative assessment methods.

Purpose of the Study:

  • To evaluate relative velocity and %HRmax as practical alternatives to HLa-P for determining training intensity.
  • To assess the accuracy of these bloodless methods in predicting steady-state exercise intensity in competitive speed skaters.

Main Methods:

  • Competitive speed skaters (N=20) underwent HLa-P using incremental 2000m/400m repetitions.
  • Relative velocity was calculated against maximal trial velocity, and %HRmax was recorded.
  • Models were cross-validated during a separate constant-velocity training session, assessing lactate changes to define steady state.

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Main Results:

  • Steady-state intensity (HLa = 4.0-6.5 mmol.l-1) correlated with 78-88% relative velocity (R²=0.807) and 84-92 %HRmax (R²=0.748).
  • HLa-P predicted 81% of training session responses.
  • The relative velocity model predicted 78% of responses, while the %HRmax model predicted 68%.

Conclusions:

  • Relative velocity and %HRmax show promise as bloodless alternatives to HLa-P for prescribing training intensity.
  • The relative velocity method demonstrates high accuracy in predicting steady-state exercise intensity in speed skaters.
  • These findings support the use of non-invasive methods for athlete assessment and training prescription.