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Laurent B. Seitz, Gabriel S. Trajano and G. Gregory Haff

Purpose:

To compare the acute effects of back squats and power cleans on sprint performance.

Methods:

Thirteen elite junior rugby league players performed 20-m linear sprints before and 7 min after 2 different conditioning activities or 1 control condition. The conditioning activities included 1 set of 3 back squats or power cleans at 90% 1-repetition maximum. A 2 × 2 repeated-measures ANOVA was used to compare preconditioning and postconditioning changes in sprint performance.

Results:

Both the back-squat and power-clean conditioning activities demonstrated a potentiation effect as indicated by improved sprint time (back squat: P = .001, ES = –0.66; power cleans: P = .001, ES = –0.92), velocity (back squat: P = .001, ES = 0.63; power cleans: P = .001, ES = 0.84), and average acceleration over 20 m (back squat: P = .001, ES = 0.70; power cleans: P = .001, ES = 1.00). No potentiation effect was observed after the control condition. Overall, the power clean induced a greater improvement in sprint time (P = .042, ES = 0.83), velocity (P = .047, ES = 1.17), and average acceleration (P = .05, ES = 0.87) than the back squat.

Conclusions:

Back-squat and power-clean conditioning activities both induced improvements in sprint performance when included as part of a potentiation protocol. However, the magnitude of improvement was greater after the power cleans. From a practical perspective, strength and conditioning coaches should consider using power cleans rather than back squats to maximize the performance effects of potentiation complexes targeting the development of sprint performance.

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Alasdair Strokosch, Loic Louit, Laurent Seitz, Richard Clarke and Jonathan D. Hughes

There exists a large and still growing body of evidence to support the phenomenon of postactivation potentiation (PAP). 1 – 4 In practical terms, PAP can be described as a lighter or explosive exercise, which has been enhanced by a previous muscular contraction, or potentiating stimulus. 1 , 2

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Olfa Turki, Wissem Dhahbi, Sabri Gueid, Sami Hmaied, Marouen Souaifi and Riadh Khalifa

revealed faster CODs at 4- and 6-minute postwarm-up (but not at the second min), compared with values collected after only 15 seconds of rest, and suggested that protocols using a 2-minute rest period 15 , 16 may be insufficient for optimizing performance. Indeed, following a potentiating stimulus, the

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Antonio Dello Iacono, Marco Beato and Israel Halperin

than relative loads derived from the 1-RM. This allows for a more accurate mechanical representation of an athlete’s individual capabilities, which presumably mediates the degree of performance improvements following a potentiating stimulus. 11 , 12 Collectively, these results suggest that the OPL