GLYCOGEN DEPLETION PATTERNS DURING CONTINUOUS AND INTERMITTENT ICE SKATING

  • 1 January 1978
    • journal article
    • research article
    • Vol. 10  (3) , 183-187
Abstract
The glycogen depletion patterns in the vastus lateralis were studied during ice skating using 8 hockey players. For each subject, exercise consisted of either repeated bouts (10) of high intensity work (120% .ovrhdot.VO2 max) [maximum O2 uptake] or continuous work (60 min) of low intensity (55% .ovrhdot.VO2 max). During continuous skating, glycogen showed a 29% decline (P < 0.05) over 60 min. In the intermittent condition, there was a 2-fold greater depletion (P < 0.05) with the most rapid loss occurring during the 1st 5 min work bouts. Histochemical analysis by fiber type indicated that the most pronounced glycogen loss was from the Type I fibers during continuous skating whereas during the intermittent condition, a preferential loss occurred in the Type II fibers, most notably the Type IIB fibers. Measurements of muscle metabolites during continuous skating indicated no change for ATP from the rest condition at 30 or 60 min, a reduction (P < 0.05) in CP [creatine phosphate] (4.1 mmol .cntdot. kg-1) at 60 min and an elevation (P < 0.05) in lactate (0.85 mmol .cntdot. kg-1) at 60 min. In the intermittent condition, reductions (P < 0.05) in ATP (0.47 mmol .cntdot. kg-1) and CP (8.7 mmol .cntdot. kg-1) and elevations (P < 0.05) in lactate (21.7 mmol .cntdot. kg-1) were found following 5 work bouts. No significant changes were observed. The glycogen depletion patterns and alteration in muscle metablolites are similar to those seen during cycling at similar percentages of .ovrhdot.VO2 max.

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