Exploring the Efficacy of Assisted, Resisted, and Free Countermovement Jumps: A Scientific Analysis

In the realm of sports science, the optimization of training methodologies for enhancing athletic performance is a focal point of research. A notable study published in The Journal of Strength and Conditioning Research in August 2011, titled “Kinetic and Training Comparisons Between Assisted, Resisted, and Free Countermovement Jumps,” provides valuable insights into the biomechanical and physiological adaptations elicited by different jump training modalities. This paper aims to dissect the findings of the study and discuss their implications for the development of evidence-based training programs.

Methodological Overview

The study in question employed a randomized controlled trial design to investigate the kinetic and training effects of three distinct countermovement jump (CMJ) variations:

  1. Assisted Jumps: Utilizing mechanisms such as elastic bands or harnesses to facilitate an increased jump height, thereby potentially enhancing the rate of force development and peak power output.
  2. Resisted Jumps: Incorporating additional weight or resistance to augment the difficulty of the jump, aiming to improve muscular strength and activation.
  3. Free Jumps: Serving as the control condition, these jumps were performed without any external assistance or resistance.

Key Findings

The analysis of the data yielded several noteworthy findings:

  • Kinetic Differences: The study revealed distinct kinetic profiles for each jump variation. Assisted jumps were characterized by an elevated rate of force development and peak power output, whereas resisted jumps were more effective in enhancing overall strength and muscle activation.
  • Training Adaptations: Longitudinal training adaptations differed between groups. Participants who engaged in assisted jump training demonstrated superior improvements in jump height and power. Conversely, those who performed resisted jumps exhibited greater gains in strength and muscle mass.
  • Implications for Training: The findings suggest that incorporating a combination of assisted, resisted, and free jumps into an athlete’s training regimen could provide a comprehensive stimulus for improving various aspects of athletic performance, including power, strength, and jump height.

Concluding Remarks

In conclusion, the study “Kinetic and Training Comparisons Between Assisted, Resisted, and Free Countermovement Jumps” contributes valuable knowledge to the field of sports science, highlighting the differential effects of various jump training modalities on athletic performance. Future research should continue to explore the optimal integration of these techniques into training programs to maximize their efficacy and applicability to diverse athletic populations.


Argus, C. K., Gill, N. D., Keogh, J. W., Blazevich, A. J., & Hopkins, W. G. (2011). Kinetic and Training Comparisons Between Assisted, Resisted, and Free Countermovement Jumps. The Journal of Strength & Conditioning Research, 25(8), 2219. https://doi.org/10.1519/JSC.0b013e3181f6b0f4



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