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High blood lactate levels after the Running Anaerobic Sprint Test (RAST) impact performance. Biomechanical changes occur alongside physiological events, affecting RAST results.

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Area of Science:

  • Sports Science
  • Exercise Physiology
  • Biomechanics

Background:

  • The Running Anaerobic Sprint Test (RAST) is known to elevate blood lactate concentrations ([La-]) post-exercise.
  • The specific influence of increasing [La-] on movement patterns during RAST performance has not been previously investigated.

Purpose of the Study:

  • To investigate the implications of elevated blood lactate ([La-]) on biomechanical patterns during the Running Anaerobic Sprint Test (RAST).
  • To analyze how physiological changes, specifically blood lactate accumulation, affect RAST performance and movement mechanics.

Main Methods:

  • Six healthy, active males performed a standardized warm-up followed by six maximal 35-m sprints with 10-second passive recovery (RAST).
  • Tridimensional and bi-dimensional biomechanics were captured using 14 cameras throughout the RAST.
  • Blood lactate ([La-]) was measured pre-warm-up, between each sprint bout, and post-RAST.

Main Results:

  • Performance significantly declined after the fifth and sixth sprints compared to the first four.
  • Fatigue indexes increased from the fifth sprint onwards.
  • While blood lactate ([La-]) did not significantly differ between the fifth and sixth sprints, it was elevated compared to earlier bouts. Flight time increased significantly in the fifth sprint compared to the first two, indicating altered movement patterns.

Conclusions:

  • RAST performance is influenced by cumulative physiological changes, including elevated blood lactate.
  • Biomechanical alterations during RAST are a consequence of physiological events and contribute to performance decrements.