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Variability and Impact of Self-Selected Interset Rest Periods During Experienced Strength Training.

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Strength athletes using self-selected rest periods for heavy squats showed session-to-session variability in power output and rest duration. Subjective fatigue and effort ratings remained stable, indicating reliable rest period selection but potential power decline during training.

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Area of Science:

  • Sports Science
  • Exercise Physiology
  • Strength and Conditioning

Background:

  • Self-selected rest periods are common in strength training.
  • Understanding variability in rest and performance is crucial for optimizing training protocols.
  • Previous research has not fully explored the reliability and impact of self-selected rest in heavy squat protocols.

Purpose of the Study:

  • To investigate the variability of self-selected interset rest periods during heavy squat training in strength-trained athletes.
  • To examine the relationship between rest periods, power output, and subjective fatigue ratings.
  • To assess the reliability of self-selected rest periods and associated training variables between sessions.

Main Methods:

  • Sixteen strength-trained male athletes performed two heavy squat sessions (5 sets of 5RM) 48 hours apart.
  • Interset rest periods were self-selected, with kinetic and temporal data recorded using a Gymaware encoder.
  • Readiness to Lift (RTL) and Rating of Perceived Effort (RPE) were measured throughout the sessions.

Main Results:

  • Significant differences were found in mean total rest time and mean power output between the two sessions.
  • Interset rest periods increased and power output decreased from Set 1 to Sets 3-5 within each session.
  • RPE increased and RTL decreased significantly from Set 3 compared to Set 1, while RPE and RTL showed good to excellent reliability between sessions.

Conclusions:

  • Highly trained athletes exhibit session-to-session variability in power output and total rest time with self-selected rest periods.
  • Self-selected rest periods are reliable for heavy squat training, but power output may decline within a session.
  • Subjective fatigue and effort ratings demonstrate stability and reliability, despite objective performance fluctuations.