MUSCLE PHOSPHOCREATINE REPLETION FOLLOWING SINGLE AND REPEATED SHORT SPRINT EFFORTS

Phosphocreatine (PCr) repletion following either single (1X6 s, n=7) o r repeated (5X6 s, departing every 30 s, n=8) maximal short sprint cyc ling efforts was measured in separate groups of trained subjects, Musc le biopsies (vastus lateralis) were taken pre-exercise before warming up, and then at 10 s, 30 s and 3 min post-exercise. After the 1X6 a sp rint PCr concentration was respectively, 55% (10 s; P<0.01), 69% (30 s ; P<0.01) and 90% (3 min; NS) of the pre-exercise value (mean+/-SD) (8 1.1+/-7.4 mmol . kg(-1) DM), whereas after the 5X6 s sprints, PCr conc entration was, respectively, 27% (10 s; P<0.01), 45% (30 s; P<0.01) an d 84% (3 min; P<0.01) of the pre-exercise value (77.1+/-4.9 mmol . kg( -1) DM). PCr concentration was correlated with muscle lactate at 30 s (r= -0.82; P<0.05) and 3 min of recovery (r= -0.94; P<0.01) for the 1X 6 s sprint. but not for the 5X6 s sprints. The extent of PCr repletion was significantly greater after the 5X6 s sprints than the 1X6 s spri nt between both 10 a and 30 s and 30 s and 3 min, despite lower PCr le vels at 10 s, 30 s and 3 min following the 5X6 a sprints. Full repleti on of PCr is likely to take longer after repeated sprints than single short sprints because of a greater degree of PCr depletion, such that replenishment must commence from lower PCr levels rather than because of slower rates of repletion.