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Here are those two papers … quite interesting actually – especially since they were done in rugby … don’t say I don’t stay up to date – JUNE 2008 … the ink is still wet!
Influence of recovery time on post-activation potentiation in professional rugby players (Journal of Sports Sciences, June 2008)
Following a bout of heavy resistance training, the muscle is in both a fatigued and potentiated state with subsequent muscle performance depending on the balance between these two factors. To date, there is no uniform agreement about the optimal acute recovery required between the heavy resistance training and subsequent muscle performance to gain performance benefits. The aim of the present study was to determine the recovery time required to observe enhanced muscle performance following a bout of heavy resistance training. Twenty professional rugby players performed a countermovement jump at baseline and *15 s, 4, 8, 12, 16, 20, and 24 min after a bout of heavy resistance training (three sets of three repetitions at 87% one-repetition maximum squat). Power output, jump height, and peak rate of force development were determined for all countermovement jumps. Despite an initial decrease in countermovement jump performance after the heavy resistance training (P50.001), participants’ performance increased significantly following 8 min recovery (P50.001) (i.e. jump height increased by 4.9%, s¼3.0). The findings suggest that muscle performance during a countermovement jump can be markedly enhanced following bouts of heavy resistance training provided that adequate recovery (*8 min) is allowed between the heavy resistance training and the explosive activity.
This one then kinda contradicts a little what we were talking about …
Effect of order of exercise on performance during a complex training session in rugby players (Journal of Sports Sciences, June 2008)
In this study, we examined the acute effects of manipulating exercise order when combining countermovement jumps and loaded parallel squats in a complex training session, and the acute effects of countermovement jumps and loaded parallel squats on sprinting performance. Eight rugby players participated in five trials, including two that involved performing loaded parallel squats followed by countermovement jumps or vice versa in a randomized cross-over design. Peak rate of force development and peak force were measured during countermovement jumps and loaded parallel squats. Peak power, jump height, and duration of amortization phase were also determined during the countermovement jumps. Peak force during squatting was significantly greater in both cross-over treatments (loaded parallel squats–countermovement jumps and countermovement jumps–loaded parallel squats) compared with the control (P 0.05), although no significant interaction effects were observed. Prior countermovement jumps resulted in slower 5-m split and overall 20-m sprint times compared with the control (countermovement jumps vs. control: 5-m split, 1.23 s, s¼0.11 vs. 1.13 s, s¼0.11; overall 20-m, 3.29 s, s¼0.19 vs. 3.18 s, s¼0.18; P50.05). It is possible to combine heavy resistance and plyometric exercises without detriment to training performance, but sprint training should be performed independently to minimize any potential interference from
prior resistance training.
There were others I had recently I must look for to compliment these …