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Group Design

Group Design

The most basic experimental design involves two groups: the experimental group and the control group. The two groups are designed to be the same except for one difference— experimental manipulation. The experimental group gets the experimental manipulation—that is, the treatment or variable being tested—and the control group does not. Since experimental manipulation is the only difference between the experimental and control groups, we can be sure that any differences between the two are due to...

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Determining the Effects of a 6-Week Training Intervention on Reactive Strength: A Single-Case Experimental Design

Benjamin Southey^1,2, Dirk Spits³, Damien Austin²

¹School of Human Movements and Nutrition Science, The University of Queensland, St. Lucia, QLD 4067, Australia.

Journal of Functional Morphology and Kinesiology

|June 26, 2025

Summary

Individual responses to plyometric training vary significantly. Single-case experimental designs (SCEDs) reveal personalized adaptations in reactive strength, crucial for effective training prescription.

Keywords:

10/5 repeated jump drop jump multiple baseline design reactive quality ratio strength training

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Published on: June 10, 2025

Area of Science:

Sports Science
Biomechanics
Exercise Physiology

Background:

Single-case experimental designs (SCEDs) offer unique insights into inter-individual training responses, surpassing traditional randomized controlled trials in specificity.
Limited sports science literature utilizes SCEDs to evaluate training intervention effectiveness.
Understanding individual adaptations in reactive strength is critical for optimizing athletic performance.

Purpose of the Study:

To investigate individual and combined changes in reactive strength following a 6-week strength and plyometric training program.
To assess the utility of SCED methodology in sports science for analyzing training adaptations.
To determine the impact of combined strength and plyometric training on reactive strength qualities.

Main Methods:

A non-concurrent multiple baseline single-case experimental design (SCED) was employed.
Four participants underwent a 5-7 week baseline phase and a 6-week intervention phase.
Weekly assessments included 10/5 repeated jump (RJ), drop jump (DJ), and loaded squat jumps.

Main Results:

Significant inter-participant variability in reactive strength changes was observed; some improved, while others declined.
The reactive strength index (RSI) for RJ significantly decreased during the intervention (2.15 to 2.0).
No significant change in DJ was noted, but the reactive quality ratio (RQR) significantly increased (1.02 to 1.08).

Conclusions:

Individual responses to reactive strength training are highly variable, emphasizing the need to move beyond cohort-based observations.
SCED is a suitable methodology for capturing these individual training adaptations in sports science.
Practitioners must consider individual factors like exercise selection, strength levels, and responsiveness when prescribing plyometric training.