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Effect of force-velocity profile-based individualized vs. non-individualized strength training on force-velocity
Gaojun Li1,2, Yang Shen1,2, Junlei Lin1,2
1School of Strength and Conditioning Training, Beijing Sport University, Beijing, China.
Purpose:
We aimed to conduct a systematic review with meta-analysis of the effects of force-velocity (FV) profile-based individualized strength training vs. non-individualized strength training on mechanical variables of FV profile and athletic performance.
Methods:
A computerized systematic literature search was performed in three electronic databases. Studies were included if they analyzed effects of FV profile-based individualized strength training on the metrics of FV measures (theoretical maximal force (F0), theoretical maximal velocity (V0), force-velocity imbalance (FVimb) and theoretical maximal power (Pmax)) and athletic performance in adults and tested at least one variable of interest. The effect sizes were determined using a robust variance estimation random-effects model and were reported as Hedge's g.
Results:
Overall, 6 studies were eligible to be included in this meta-analysis. Individualized FV strength training lasted between 7 and 10 weeks, with 2 weekly sessions and 8-28 sets per week. Strength training intensities ranged between 70 and 85% of the one-repetition maximum (1-RM) x 3-10 repetitions resistance training (training load ratio range: 70-100% : 30 - 0%) and velocity-oriented training involved 0-60% body mass x 3-10 repetitions plyometric training (training load ratio range: 70-100% : 30 - 0%). The meta-analysis showed significant and large differences between both training conditions for F0 (g = 0.99, p < 0.01), V0 (g = 0.78, p < 0.01), FVimb (g = 0.60, p < 0.01) and vertical jump height (g = 0.82, p < 0.01) favoring individualized strength training, whereas there was a non-significant effect on Pmax (g = -0.12, p = 0.42) and sprint performance (g = 0.18, p = 0.45), CONCLUSION: Our findings suggest that FV profile-based individualized training may confer advantages for FV profile optimization and vertical jump performance, the high degree of heterogeneity underscores the need for cautious interpretation and further well-controlled studies. Therefore, practitioners should specifically and carefully consider individual FV profile when programming individualized strength training.
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