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Interval versus continuous training with identical workload: physiological and aerobic capacity adaptations.

G G de Araujo1, C A Gobatto, M Marcos-Pereira

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Interval training (IT) promotes glycogen super-compensation and higher training volume compared to continuous training (CT). However, neither training method improved aerobic performance in Wistar rats.

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Biochemistry

Background:

  • Interval training is often recommended for aerobic adaptations due to its potential for higher intensity and workload.
  • The comparative effects of interval training versus continuous training on physiological and aerobic capacity adaptations, especially at equivalent workloads, remain unclear.

Purpose of the Study:

  • To investigate the chronic and acute biomarker adaptations and aerobic capacity in Wistar rats subjected to interval training (GTI) and continuous training (GTC) protocols with equivalent workloads.

Main Methods:

  • Fifty Wistar rats were divided into continuous training (GTC), interval training (GTI), and control (CG) groups.
  • Training lasted 8 weeks at anaerobic threshold (AT) velocity.
  • Measurements included glycogen, free fatty acids, glucose, corticosterone, testosterone, and aerobic capacity.

Main Results:

  • Interval training (GTI) resulted in glycogen super-compensation 48 hours post-session and a higher total training volume compared to continuous training (GTC).
  • Aerobic capacity showed an insignificant 11% reduction in GTC versus GTI post-training.
  • Testosterone levels decreased significantly in GTC immediately post-exercise, while corticosterone increased acutely in both GTI and GTC groups.

Conclusions:

  • Interval training (GTI) offers advantages over continuous training (GTC) regarding glycogen storage, training volume, and anabolic status.
  • Despite these benefits, interval training did not enhance aerobic performance in this study.
  • Further research is needed to understand the nuances of training protocols and their impact on physiological adaptations and performance.