One variable of research that’s always important to consider is the training status of the subjects used. Untrained subjects will make gains of all kinds with pretty much any type of exercise – this is because exercise in general is a new stimulus to them! However, trained subjects follow the SAID Principle in that they will adapt specifically to whatever training they do. Strength training will boost size and strength, endurance training will improve endurance, and power training increases power. The cited study is a great example of untrained subjects making general gains despite different training protocols.
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▪️ Example Study: Lyttle, A. D., Wilson, G. J., & Ostrowski, K. J. (1996). Enhancing performance: Maximal power versus combined weights and plyometrics training. Journal of Strength and Conditioning Research, 10, 173-179.