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The Journal of Sports Medicine and Physical Fitness 1999 September;39(3):189-96

Copyright © 2000 EDIZIONI MINERVA MEDICA

lingua: Inglese

Oral crea­tine sup­ple­men­ta­tion ­improves mul­ti­ple ­sprint per­for­mance in ­elite ice-hock­ey ­players

Jones A. M., Atter T., Georg K. P.

Department of Exercise and Sport Science, Crewe and Alsager Faculty, the Manchester Metropolitan University, Hassal Road, Alsager, UK


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Background. The pur­pose of ­this ­study was to ­assess the ­effect of ­oral crea­tine mono­hy­drate sup­ple­men­ta­tion on mul­ti­ple ­sprint ­cycle and skat­ing per­for­mance in ice-hock­ey ­players.
Methods. Participants: six­teen ­elite ice-hock­ey ­players ­were select­ed as sub­jects. Experimental ­design: sub­jects ­were ran­dom­ly ­assigned to ­either a crea­tine (Cr) (n=8) or a pla­ce­bo (P) ­group (n=8) in a dou­ble ­blind ­design. After famil­iar­isa­tion and base­line ­tests, sub­jects load­ed ­with 5 g of crea­tine mono­hy­drate or pla­ce­bo (glu­cose) ­four ­times per day for 5 ­days, ­after ­which a main­te­nance ­dose of 5 g per day for 10 ­weeks was admin­is­tered. At base­line, and ­after 10 ­days and 10 ­weeks of sup­ple­men­ta­tion, sub­jects per­formed i) a ­cycle ­test involv­ing 5 all-out ­sprints of 15 sec dura­tion sep­ar­at­ed by 15 sec recov­ery ­with the resis­tance set at 0.075 ­body ­mass (kg), and ii) 6 ­timed 80-m skat­ing ­sprints ­with the ­sprints initiat­ed eve­ry 30 sec and a ­split ­time tak­en at 47 m.
Results. A two-way ANO­VA dem­on­strat­ed no sig­nif­i­cant ­change in any of the var­i­ables in the P ­group ­over the peri­od of ­study. However, in the Cr ­group, aver­age ­mean pow­er out­put ­over the 5 ­sprints was sig­nif­i­cant­ly high­er at 10 ­days (1074±241 W) and 10 ­weeks (1025±216 W) ­than at base­line (890±172 W), (p<0.01). Average ­peak pow­er out­put ­over the 5 ­sprints ­improved sig­nif­i­cant­ly ­from base­line (1294±311 W) to 10 ­days (1572±463 W), (p<0.01). Average on-ice ­sprint per­for­mance to 47 m was sig­nif­i­cant­ly fast­er at 10 ­days (6.88±0.21 sec) and 10 ­weeks (6.96±0.19 sec) ­than at base­line (7.17±0.27 sec), (p<0.005).
Conclusions. This ­study dem­on­strates ­that crea­tine sup­ple­men­ta­tion has an ergo­gen­ic ­effect in ­elite ice-hock­ey ­players.

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