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Bogdanis, GC, Tsoukos, A, Veligekas, P, Tsolakis, C, and Terzis, G. Effects of muscle action type with equal impulse of conditioning activity on postactivation potentiation. J Strength Cond Res 28 (9): 2521–2528, 2014—This study investigated the effects of muscle action type during conditioning activity (half-squat) on subsequent vertical jump performance. Fourteen track and field athletes (relative half-squat of 2.3±0.3 times their body weight) completed 4 main trials in a randomized and counterbalanced order 5–7 days apart:(a) concentric (CON) half-squats: 7.5±1.2 repetitions against 90% of 1 repetition maximum (1RM),(b) eccentric (ECC) half-squats: 9.3±1.5 repetitions against 70% of 1RM, and (c) 3 sets of 3-second maximal isometric (ISO) half-squats,(d) a control (CTRL) trial, where subjects rested for 10 minutes. The number of repetitions in CON and ECC was adjusted so that the impulse of the vertical ground …