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Optimal Minimum-Velocity Threshold to Predict One-repetition Maximum for the Back Squat.
Afonso Fitas1, Miguel Gomes1,2, Paulo Santos1,2
1Neuromuscular Research Lab, Faculdade de Motricidade Humana, Universidade de Lisboa, Estrada da Costa, 1499-002, Cruz Quebrada, Dafundo, Portugal.
International Journal of Sports Medicine
|July 28, 2024
Summary
The optimal minimum-velocity threshold (MVT) improves one-repetition maximum (1RM) predictions in athletes. While accurate, the optimal MVT method showed wide agreement limits for 1RM estimations in strength and conditioning.
Area of Science:
- Sports Science
- Biomechanics
- Strength and Conditioning
Background:
- One-repetition maximum (1RM) prediction is crucial for strength and conditioning programs.
- The minimum-velocity threshold (MVT) concept has emerged to enhance 1RM prediction accuracy.
- Individual load-velocity profiles (LVPs) provide personalized performance data.
Purpose of the Study:
- To evaluate the accuracy and reliability of 1RM predictions using different MVT strategies.
- To compare optimal MVT with general and individual MVT for 1RM estimation.
- To assess the utility of optimal MVT in recreational soccer athletes.
Main Methods:
- Load-velocity profiles (LVPs) were generated for 18 recreational soccer athletes.
- 1RM estimations were performed using general (0.3 m/s), individual, and optimal MVT.
- Reliability analyses (ICCs, CVs) and accuracy metrics (absolute percent error, Bland-Altman plots) were computed.
Main Results:
- LVPs and 1RM demonstrated good between-day reliability (ICCs > 0.9, CVs < 5%).
- Optimal and individual MVT showed moderate-to-good reliability (ICCs > 0.9, CVs < 10%).
- Optimal MVT yielded higher accuracy (2.8% error) compared to individual (5.5%) and general (4.9%) MVT, but with wide limits of agreement (~15 kg).
Conclusions:
- The optimal MVT offers superior accuracy for predicting 1RM in the free-weight back squat compared to general and individual MVT.
- Despite improved accuracy, the optimal MVT approach has limitations regarding the agreement between actual and estimated 1RM.
- The findings support the use of optimal MVT for more precise 1RM estimations in strength training contexts.
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