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Variations in Verbal Encouragement Modify Isokinetic Performance.

Nicole K Rendos1,2, Kysha Harriell2, Shayaan Qazi2

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Verbal cues like "as fast as you can" and "as hard and as fast as you can" significantly enhance isokinetic performance. These specific instructions should be used during isokinetic testing to maximize participant output.

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Biomechanics

Background:

  • Verbal encouragement is common in exercise testing but its impact on performance is often uncontrolled.
  • While verbal cuing effects have been studied in isometric contractions, their influence on isokinetic testing remains underexplored.
  • Isokinetic testing is a standardized method for assessing muscle performance in various settings.

Purpose of the Study:

  • To investigate the effects of different verbal encouragement strategies on isokinetic performance.
  • To determine if specific verbal cues can optimize outcomes during isokinetic knee flexion and extension.

Main Methods:

  • Twenty-three healthy adults participated in four randomized isokinetic testing sessions.
  • Participants performed knee flexion and extension at three different speeds (60°·s, 180°·s, 300°·s) with five-minute recovery periods.
  • Four verbal encouragement conditions were tested: "as fast as you can" (FAST), "as hard as you can" (HARD), "as hard and as fast as you can" (BOTH), and no verbal encouragement (NO CUE).

Main Results:

  • The FAST and BOTH verbal cues resulted in significantly greater work, peak torque, and power output across all tested speeds.
  • No significant difference was found between the HARD and NO CUE conditions.
  • The FAST and BOTH cues demonstrated a clear advantage in maximizing isokinetic performance.

Conclusions:

  • Verbal cues emphasizing speed and intensity, specifically "as fast as you can" and "as hard and as fast as you can," are effective in maximizing isokinetic performance.
  • These findings suggest that standardized verbal encouragement protocols can improve the reliability and validity of isokinetic testing.
  • Coaches and clinicians should consider implementing these specific verbal cues to optimize athletic and rehabilitation outcomes.