The purpose of this investigation was to determine the effect of passive and active recovery on the resynthesis of muscle glycogen after high intensity cycle ergometer exercise in untrained subjects. In a cross over design, six college-age males performed three, one min exercise bouts, at 130% V02max with a 4 min rest period between each work bout. Subjects refrained from exercise for two days prior to testing, and consumed a 15% carbohydrate solution (300g sugar in 2000ml of water) the day before each trial to help elevate glycogen concentration. The exercise protocol for each trial was identical, while the recovery following exercise was eitheractive (40-50% VO2max) or passive. The initial muscle glycogen values averaged 144.2 mmol•kg-1 w.w. for the active trial and 158.7 mmol•kg-1 w.w. for the passive trial. Corresponding post-exercise glycogen contents were 97.7 and 106.8 mmol•kg-1 w.w., respectively. These differences were not significant (P>0.05). However, the rate of muscle glycogen resynthesis during passive recovery increased 15 mmol•kg-1 w.w. whereas it decreased 6.27 mmol•kg-1 w.w. following active recovery (P<0.01). Also, the decrease in blood lactate concentration during active recovery was much faster than during passive recovery and significantly different at 10 and 30 min of the recovery period (P<0.01). The major finding of this investigation was that the rate of muscle glycogen resynthesis during passive recovery was significantly greater than that during active recovery. These data suggest that lactate can be used as an endogenous glycogenic precusor in muscle, and that glycogenesis was the prevalent pathway of lactate removal during passive recovery following high intensity cycle ergometer exercise. / Human Performance Laboratory
| Identifer | oai:union.ndltd.org:BSU/oai:cardinalscholar.bsu.edu:handle/184612 |
| Date | January 1993 |
| Creators | Choi, DaiHyuk |
| Contributors | Ball State University. Human Performance Laboratory., Costill, David L. |
| Source Sets | Ball State University |
| Detected Language | English |
| Format | ix, 58 leaves : ill. ; 28 cm. |
| Source | Virtual Press |
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