Is Mechanical Power a Valid and Relevant Parameter to Control Resistance Training?

Puschkasch-Möck, S, Haff, GG, Behringer, M, and Wirth, K. Is mechanical power a valid and relevant parameter to control resistance training? J Strength Cond Res 40(3): 356-365, 2026-Theoretical models of the force-velocity and force-length relationships suggest that maximal mechanical power occurs at an intermediate load and velocity. This concept has led to the widespread use of optimal power load prescriptions in resistance training. This review critically evaluates whether mechanical power is a valid and relevant parameter for controlling resistance training, particularly in the context of improving athletic performance. Although several studies report neuromuscular adaptations after power-oriented training, the generalizability of these findings is limited by short intervention durations, participants with low training status, and inconsistent measurement protocols. Moreover, methodological limitations in estimating mechanical power during complex, multijoint movements raise doubts about its physiologic and functional validity. Evidence from research in biomechanics, muscle architecture, and neural control indicates that maximal strength remains the dominant predictor of mechanical power production and sport performance. The concept of training at the optimal power load fails to account for sport-specific demands, individual force-velocity characteristics, and the principle of task specificity. Instead, a periodized approach prioritizing maximal strength development, followed by ballistic and speed-oriented exercises, is recommended for long-term power development. In conclusion, although mechanical power may offer some value for short-term monitoring or block structuring, it lacks the robustness and specificity required for load control in performance-oriented resistance training.