Joint-level energetics differentiate isoinertial from speed-power resistance training-a Bayesian analysis

Area of Science:

• Exercise Physiology
• Biomechanics
• Sports Science

Background:

• Evidence supports resistance training for vertical jump improvement, but optimal prescription remains unclear.
• This study compares isoinertial resistance versus speed-power training for jump performance.
• Bayesian statistics were employed to detect subtle differences between training modalities.

Purpose of the Study:

• To compare the effectiveness of isoinertial resistance training against speed-power training.
• To analyze changes in countermovement jump (CMJ) and squat jump (SJ) height.
• To investigate alterations in joint energetics during jumping.

Main Methods:

• Active adults were randomized into six-week isoinertial (n=16) or speed-power (n=14) training groups.
• Primary outcomes included jump height and joint power.
• Bayesian mixed modeling and Functional Data Analysis determined significance via 95% Bayesian Credible Intervals (CrI).

Main Results:

• Isoinertial training yielded a 1.95 cm greater gain in CMJ height compared to speed-power training.
• Squat jump (SJ) height gains were similar between training groups.
• Isoinertial training led to greater power absorption increases at the hip, knee, and foot during CMJ.

Conclusions:

• Short-term isoinertial training demonstrated superior improvement in CMJ height over speed-power training.
• The primary adaptive difference between training methods was observed in hip, knee, and foot power absorption.
• Isoinertial training may be a more effective modality for enhancing specific aspects of jump performance.