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The Effect of Hip Joint Angle on Isometric Midthigh Pull Kinetics
Thomas DosʼSantos1, Christopher Thomas, Paul A Jones
1Human Performance Laboratory, Directorate of Sport, Exercise, and Physiotherapy, University of Salford, Greater Manchester, United Kingdom.
Journal of Strength and Conditioning Research
|September 22, 2017
Summary
The 145° hip angle during isometric midthigh pull (IMTP) testing yields superior force development and rate of force development compared to the 175° angle. Coaches should utilize the 145° hip angle for IMTP assessments to optimize performance insights.
Area of Science:
- Biomechanics
- Sports Science
- Human Movement Analysis
Background:
- Isometric midthigh pull (IMTP) is a common assessment for lower-body strength.
- Optimal joint angles for IMTP testing are not fully established.
- Understanding hip joint angles' impact on force production is crucial for athletic performance evaluation.
Purpose of the Study:
- To compare isometric midthigh pull (IMTP) peak force, time-specific force, rate of force development (RFD), and net forces between 145° (hip145) and 175° (hip175) hip joint angles.
- To assess the reliability and variability of IMTP kinetics across different hip joint angles.
Main Methods:
- Twenty-eight collegiate athletes performed IMTP tests at standardized knee angles with two different hip angles (145° and 175°).
- Testing included within-session and between-session reliability measures.
- Kinetic variables such as peak force, time-specific forces, RFD, and net forces were analyzed.
Main Results:
- The 145° hip angle demonstrated significantly greater time-specific forces, RFD, and net forces compared to the 175° hip angle.
- Peak force and force at 100 ms showed trivial, nonsignificant differences between the two hip angles.
- Higher body weights (pre-tension force) were observed at the 175° hip angle.
Conclusions:
- The 145° hip joint angle is recommended for IMTP testing due to enhanced force production and rate of force development.
- This angle also results in lower pre-tension forces, providing a clearer measure of muscular strength.
- Coaches should adopt the 145° hip angle for more effective IMTP assessments.