The article below attempts to answer the question of what the optimal weight room load is for soccer players. The authors come to the conclusion that..
During the competition period, a load of 50% of a 1RM should be used in a BP to maintain muscular power over a wide load range.
While I don’t necessarily disagree with these findings, the method to come to this conclusion is flawed. This is an observational study just as the stop-motion analysis studies of soccer matches that show how far, how fast, and how many high intensity efforts a player performs in a game are. But we must realize that just because you see these outcomes in test (or match) scenarios doesn’t mean that replicating them are the best way to train those qualities. Just as Coach Mladen pointed out, in this excellent blog, expression does not equal development. So while the findings on power output are likely true (many other studies indicate that peak power output occurs in the range of 30-60% of 1RM loads) the extrapolation for training may be limited.
I prefer to train with loads across the entire continuum of the force-velocity curve and previous research supports this method as the best for improving athletic performance.
J Strength Cond Res. 2011 Oct;25(10):2764-72.
Optimal load maximizes the mean mechanical power output during upper extremity exercise in highly trained soccer players.
Human Motion Diagnostic Center, University of Ostrava, Ostrava, Czech Republic. firstname.lastname@example.org
The purpose of this study was to determine the optimal load for the maximal power output during the acceleration phase of a power movement in bench press (BP) exercises of highly trained soccer players at the beginning of a competition period. Fifteen professional male soccer players with an average age of 26.1 ± 3.9 years, an average height of 183.3 ± 6.7 cm, an average body mass of 78.8 ± 7.2 kg, and an average 1 repetition maximum (1RM) of 83.3 ± 11.2 kg were employed as subjects in this study. Maximal mean power output during a BP at 0, 10, 30, 50, 70, and 90% of their 1RM was measured to determine whether an optimal load exists that allows for the attainment of maximal power output. Three-dimensional upper extremity kinematic data were collected. Two force plates embedded in the floor and positioned below the bench were used to measure contact forces between the bench and ground during the lift. A repeated-measures analysis of variance was performed to determine power outputdifferences at different percentages of the 1RM. The results of this study indicated that loads of 50% of the 1RM resulted in greater mean poweroutput during the complete positive power movement. Loads at 30 and 50% of the 1RM resulted in greater mean power output computed from the acceleration phase of the lift than did all loads and were not statistically different from each other. However, individual soccer players did not reach the maximum power output with the same relative load. In conclusion, when soccer players develop muscular power toward the end of when the most important competitions are scheduled, dynamic effort strength training with the range of load from 30 to 50% of 1RM BP should be used. During the competition period, a load of 50% of a 1RM should be used in a BP to maintain muscular power over a wide load range.
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