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Effects of Variable Resistance Training on Maximal Strength: A Meta-Analysis
Miguel A Soria-Gila1, Ignacio J Chirosa, Iker J Bautista
1Department of Physical Education and Sport, University of Granada, Granada, Spain.
Journal of Strength and Conditioning Research
|May 14, 2015
Summary
Variable resistance training (VRT) significantly boosts maximal strength gains compared to traditional weightlifting. This evidence-based method is effective for both athletes and untrained individuals seeking to improve strength.
Area of Science:
- Exercise Physiology
- Sports Science
- Biomechanics
Background:
- Variable resistance training (VRT) enhances force production, muscle coordination, and motor unit recruitment.
- Long-term effects of VRT on maximal strength in athletes and untrained individuals remain debated.
Purpose of the Study:
- To conduct a meta-analysis comparing long-term (≥7 weeks) VRT (using chains/bands) with constant resistance training.
- To evaluate VRT's impact on maximal strength (1 repetition maximum) in trained and untrained adults.
Main Methods:
- Meta-analysis of seven studies involving 235 subjects.
- Inclusion criteria focused on studies examining VRT effects on 1 repetition maximum.
- Random-effects model used to compare intervention effect sizes.
Main Results:
- Variable resistance training resulted in significantly greater mean strength gains (5.03 kg) compared to conventional training.
- The difference in strength gain was statistically significant (p < 0.001).
Conclusions:
- Long-term VRT using chains or elastic bands is an effective method for increasing maximal strength.
- VRT demonstrates benefits for both trained athletes and untrained individuals.
