Test Re-Test Reliability of Peak Force During Isometric Knee extension and Squat

Authors

Elijah Castanuela, Tarleton State University, StephenvilleFollow
Amy Reira, Tarleton State University, StephenvilleFollow
Lyric Richardson, Tarleton State University, StephenvilleFollow
Jesus Hernandez-Sarabia, California State University, BakersfieldFollow
Carlos Estrada, Aurora University, AuroraFollow
Jason M. Defreitas, Oklahoma State University, StillwaterFollow
Micheal J. Luera, Tarleton State University, StephenvilleFollow

Abstract

Acquiring reliable performance outcomes for laboratory procedures is critical for evaluation and prescription thereafter. Additionally, reliable data collected from separate testing days may present potential errors in the overall methodological approach. Instructing and testing participants to perform tasks that are relatively new can come with a learning curve and may require additional practice and familiarization. PURPOSE: To determine the reliability of peak force production during the isometric knee extension (KE) and squat (SQ) performed on two separate days. METHODS: Fourteen male (23±3 yrs.; 87.74±11.82 kg; 175.57±6.92 cm ) and 12 female (23±3 yrs., 62.79±5.89kg; 165±5.76cm) lower body resistance trained individuals completed 8 separate maximal isometric voluntary contractions (MVCs) of the KE and SQ using an S-Beam load cell and custom made chair and platform. Following a familiarization visit, each subject randomly completed two MVCs at 110° and 150° (KE_110°, KE_150°, SQ_110°, SQ_150°) of knee extension for both performances on two-separate visits. The MVC that had the highest force was chosen for further analysis using the interclass correlation coefficient (ICC_3,1) for reliability between days (KE_110°, KE_150°, SQ_110°, SQ_150°). RESULTS: For MVCs during KE_150°, SQ_110°, and SQ_150°, there was no systematic variability in force between days (ICC_3,1 = 0.71-0.91). However, for KE_110° , there was a difference (p= 0.04) in ICC_3,1 for peak force between testing days. CONCLUSION: Performing MVCs during isometric KE and SQ on separate days may provide reliable outcomes for measuring force production. However, consideration may need to be taken when requiring participants to perform at knee joint angles that may require more practice or comfortability with the movement task.

Recommended Citation

Castanuela, Elijah; Reira, Amy; Richardson, Lyric; Hernandez-Sarabia, Jesus; Estrada, Carlos; Defreitas, Jason M.; and Luera, Micheal J. (2022) "Test Re-Test Reliability of Peak Force During Isometric Knee extension and Squat," International Journal of Exercise Science: Conference Proceedings: Vol. 2: Iss. 14, Article 128.
Available at: https://digitalcommons.wku.edu/ijesab/vol2/iss14/128