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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Neuromuscular Performance

Background:

  • High-intensity training methods are popular for improving athletic performance.
  • Understanding the acute effects of different high-intensity running protocols on subsequent resistance training is crucial for program design.

Purpose of the Study:

  • To investigate the acute effects of high-intensity interval training (HIIT) and sprint interval training (SIT) on resistance training (RT) performance.
  • To examine the combined effects of these running protocols on lower-body maximal neuromuscular capacities.

Main Methods:

  • Eighteen healthy subjects completed three protocols: resistance training (RT) alone, HIIT + RT, and SIT + RT.
  • RT involved back squats at 60% of 1RM to 10 repetitions or 20% velocity loss.
  • HIIT consisted of 4 intervals of 4 minutes at ~110% functional threshold power; SIT involved 6 all-out 30-second sprints.

Main Results:

  • Sprint interval training (SIT) significantly reduced the number of back-squat repetitions, fastest velocity, and average velocity compared to RT alone.
  • No significant differences in RT performance were found between RT and HIIT + RT protocols.
  • All protocols similarly decreased maximal velocity (v0) and maximal power (Pmax), but maximal force (F0) tended to decrease after SIT + RT.

Conclusions:

  • Sprint interval training (SIT) acutely impairs resistance training quality and maximal force production more than long-interval high-intensity interval training (HIIT).
  • Exercise sequencing is critical; SIT should be used cautiously before resistance training sessions to avoid performance decrements.
  • HIIT appears to be a more compatible high-intensity running modality when combined with resistance training.