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Induction and Assessment of Exertional Skeletal Muscle Damage in Humans

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Effectiveness of the 1RM estimation method based on isometric squat using a back-dynamometer.

Shinich Demura¹, Kazuyoshi Miyaguchi, Sohee Shin

¹Kanazawa University Graduate School of Natural Science & Technology, Kakuma, Kanazawa, Ishikawa, Japan.

Journal of Strength and Conditioning Research

|October 2, 2010

Summary

Isometric squat (IS) with a wide stance and parallel depth shows a strong correlation with 1-repetition maximum (1RM) squat performance. However, accurately estimating 1RM using IS with a back dynamometer remains challenging due to high variability.

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Area of Science:

Sports Science
Biomechanics
Exercise Physiology

Background:

The 1-repetition maximum (1RM) squat is a key measure of lower body strength.
Estimating 1RM without maximal testing is desirable for safety and efficiency.
Isometric squat (IS) offers a potential alternative for 1RM assessment.

Purpose of the Study:

To investigate the relationship between isometric squat (IS) performance and 1-repetition maximum (1RM) squat.
To assess muscle activity during IS and its correlation with 1RM.
To evaluate the effectiveness of IS for estimating 1RM squat force.

Main Methods:

15 male participants with weight training experience performed IS with varied stance widths and squat depths.
Maximal force output and agonist muscle activity (% root mean square) were measured during IS.
IS data were compared with established 1RM squat values.

Main Results:

Maximal force during IS was significantly higher with a wide stance and decreased knee flexion (parallel depth).
Muscle activity in the rectus femoris and vastus lateralis tended to be higher in a wide stance.
A significant correlation (r=0.73) was found between wide stance, parallel depth IS force and 1RM squat.
Linear regression yielded an equation for 1RM estimation, but with a large standard error (11.19 kg).

Conclusions:

Isometric squat performed with a wide stance and at parallel depth may serve as a useful indicator for 1RM squat.
Estimating precise 1RM values using isometric squat with a back dynamometer is challenging due to significant variability.
Further research may be needed to refine IS protocols for more accurate 1RM prediction.