Measurement agreement (repeatability) for a countermovement jump protocol using a portable forceplate

Area of Science:

• Biomechanics
• Sports Science
• Human Movement Analysis

Background:

• Accurate jump height measurement is crucial in sports science.
• Portable forceplates offer a practical alternative to laboratory equipment.
• Understanding measurement agreement is key for reliable data collection.

Purpose of the Study:

• To assess the measurement agreement of jump height using a portable forceplate.
• To determine the reliability of jump height measures across multiple attempts and sets.
• To investigate potential effects of fatigue and learning on jump height data.

Main Methods:

• 72 university-age participants (42 female, 30 male) performed 25 maximal jump attempts.
• Jump height was measured using a portable forceplate sampling at 500 Hz.
• Ratio limits of agreement (LOAs) were calculated to assess measurement consistency.

Main Results:

• No systematic bias was found in jump height measurements.
• Jump height remained stable within participants across all jump sets, indicating no significant fatigue or learning effects.
• Ratio LOAs were consistently around 1.08 for the total group, females, and males, demonstrating good agreement.

Conclusions:

• The portable forceplate jump protocol provides stable and reliable jump height measures.
• The protocol is suitable for assessing jump performance in active, university-age populations.
• Ratio LOAs are valuable for interpreting research findings using this protocol.