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Simplifying strength assessment and prescription. Predictive model for biceps 1RM based on isometric dynamometry and
Jose M de la Lama1, Ana Lopez2, Adela Gomez3
1Physical Medicine and Rehabilitation Service, Cardiac Rehabilitation Unit. Virgen de La Merced University Hospital, Osuna, Spain.
Journal of Bodywork and Movement Therapies
|September 16, 2025
Summary
Estimating biceps curl one-repetition maximum (1RM) is feasible using isometric strength measurements. Handheld dynamometry provides a strong predictor for 1RM, aiding safe resistance training prescription.
Area of Science:
- Exercise Physiology
- Biomechanics
- Sports Science
Background:
- Accurate one-repetition maximum (1RM) estimation is vital for effective resistance training.
- Traditional 1RM testing can be impractical or unsafe for certain individuals.
- Developing alternative predictive models is crucial for broader application.
Purpose of the Study:
- To develop a predictive model for biceps curl 1RM.
- To utilize biometric data and handheld dynamometry for 1RM prediction.
- To assess the correlation between isometric strength and 1RM.
Main Methods:
- Thirty-one adults (trained and sedentary) were assessed.
- Data included age, height, weight, sex, isometric elbow flexion force, and handgrip strength.
- Pearson correlation and linear regression analyses were performed.
Main Results:
- Isometric biceps strength strongly correlated with 1RM (R=0.8608).
- The predictive model showed substantial value (R²=0.74, p<0.001).
- Trained individuals had higher 1RM-to-isometric strength ratios than sedentary individuals.
Conclusions:
- Isometric elbow flexion force is a strong predictor of biceps curl 1RM.
- Handheld dynamometry offers a viable alternative for 1RM estimation.
- Findings support its use in resistance training prescription, especially when maximal testing is contraindicated.
