OSR Journal of Student Research

Article Title

The Intra-rater Reliability of the Force Plate Peak Forces at Three Specific Time Frames


Purpose: Rate of force development (RFD) in functional activities is important to measure for post Anterior Cruciate Ligament (ACL) reconstruction athletes to assist in the decision to return to play. Most ACL injuries occur within 100 milliseconds (msec) of contact to the ground; hence RFD at the 25, 50, and 100 msec time frames are critical. The purpose of this study was to assess the intra-rater reliability of the software program designed to read the RFD at these specific time frames as a precursor to an ACL study. Methods: Seventeen healthy participants (Females = 6, Males = 11) between 18-30 years old participated in this study. After a brief warm-up and familiarization period, participants performed a single leg countermovement jump to a self-selected depth while keeping their hands on their hips. Upon landing from their vertical jump, the participants rapidly stabilized to remain vertical. Each participant completed 2 trials for each leg. Data were collected for peak force at 25, 50, and 100 msec. An intraclass correlation coefficient (ICC) was calculated to determine the intra-rater reliability between the two trials. Results: The ICC values and 95% confidence intervals (CI) between the two trials for 25, 50, and 100 msec were 0.990 (95% CI 0.971 - 0.996), 0.971 (95% CI 0.922 - 0.990), and 0.956 (95% CI 0.878 - 0.984), respectively. Conclusion: There is a strong intra-rater reliability for assessing forces developed at 25, 50, and 100 msec with the software program designed to read the RFD at these time frames.

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