Preview
Hüseyin Akbulut, MSc (2026). Isometric Squat Force Test: Protocol and Application. Sporeus. Retrieved, November 14, 2026. https://sporeus.com/en/egzersiz-testleri-en/isometric-squat-force-test/
Measures: Lower-body isometric strength, leg drive
Table of Contents
Difficulty: Moderate | Category: Strength
Protocol
The Isometric Squat Force Test measures lower-body force by having the participant push up with maximum force against a fixed bar in a specific squat position (typically 90–130° knee flexion angle).
Preparation: Force platform is calibrated. Power rack bar height is adjusted to match the participant’s squat position. The participant warms up for 10 minutes and performs 2–3 submaximal trials.
Test Procedure: The participant assumes the selected squat position on the force platform. Bar is placed on the shoulders in back squat position. On command, they push the bar upward with maximum force for 3–5 seconds. The bar does not move; force is produced isometrically. Verbal motivation is provided.
Trials: 3 trials with 3–5 minutes rest between. Highest value used.
Calculation: Peak force (N), RFD, and impulse values are calculated by the force platform. Relative force = Peak F / BW. The effect of knee flexion angle on force is noted; comparison at 90° and 130° can be made.
Post-Test: Leg and back stretching. Results correlated with dynamic squat tests.
Formula
Relative peak force = PF_N / (body mass_kg × 9.81), in multiples of body weight; RFD = ΔF/Δt
Equipment Required
force platform, power cage or fixed bar
Interpretation
There is no single widely accepted normative table for this test. Results are best interpreted against the person’s previous measurements with the same protocol and equipment (and, where relevant, left-right comparison).
Practical Applications
The isometric squat test is used in tracking training adaptation in Olympic weightlifting and strength athletes, assessing lower-body asymmetry, and making return-to-sport decisions in rehabilitation.
Limitations
Force platform is essential. Maintaining a constant knee flexion angle is difficult; visual control or goniometer is required for standardization.
Related Tests: Isometric Mid-Thigh Pull (IMTP), 1RM Back Squat Test, Rate of Force Development (RFD)
Sources: Haff GG et al., 2015, Int J Sports Physiol Perform; Murphy AJ & Wilson GJ, 1996, J Sports Sci
Hüseyin Akbulut is the founder of Sporeus and author of THRESHOLD (EŞİK), a 540-page Turkish-language book on endurance science.
- 540pp THRESHOLD Book
- MSc Sport Sciences
- Marmara University
Protocol The Isometric Squat Force Test measures lower-body force by having the participant push up with maximum force against a fixed bar in a specific squat position (typically 90–130° knee flexion angle). Preparation: Force platform is calibrated. Power rack bar height is adjusted to match the participant's squat position. The participant warms up for 10 minutes and performs 2–3 submaximal trials. Test Procedure: The participant assumes the selected squat position on the force platform. Bar is placed on the shoulders in back squat position. On command, they push the bar upward with maximum force for 3–5 seconds. The bar does not move; force is produced isometrically. Verbal motivation is provided. Trials: 3 trials with 3–5 minutes rest between. Highest value used. Calculation: Peak force (N), RFD, and impulse values are calculated by the force platform. Relative force = Peak F / BW. The effect of knee flexion angle on force is noted; comparison at 90° and 130° can be made. Post-Test: Leg and back stretching. Results correlated with dynamic squat tests. Formula
Relative peak force = PF_N / (body mass_kg × 9.81), in multiples of body weight; RFD = ΔF/Δt
Equipment Required
force platform, power cage or fixed bar
Interpretation
There is no single widely accepted normative table for this test. Results are best interpreted against the person's previous measurements with the same protocol and equipment (and, where relevant, left-right comparison).
