Exercise performance was examined after ingestion of 45 g of liquid carbohydrate (LCHO), solid carbohydrate (SCHO), or water (W) 5 min before 1 h of intense exercise.An (CHO) meal (200 g) taken 4 h prior to exercise was combined with a solid CHO feeding (M+SCHO). Ten well-trained male cyclists (4.35 + 0.11 1/min V02 max) performed 45 min of cycling at a work load requiring an average oxygen uptake of 77.1% V02 max followed by a 15 min performance ride. Serum glucose values were elevated by 18% and 24% during SCHO and LCHO, respectively, as compared to W. Blood glycerol concentrations were significantly (p<0.05) lower during M+SCHO and significantly higher during W at 40, 50 and 60 min of exercise as compared to all other trials. Muscle biopsies at 0 and 45 min revealed no significant differences in muscle glycogen concentration or total use between the 4 trials. Total work produced during the final 15 min of exercise was significantly greater during M+SCHO (194735 + 9448 NM) as compared to all other trials and significantly greater during LCHO and SCHO (175204 + 11780 and 176013 + 10465 NM, respectively) as compared to W (159143 + 11407 NM). Carbohydrate oxidation was highly correlated (r=0.94) with work production. These results suggest that exercise performance is enhanced with the ingestion of 45 g of CHO 5 min prior to one hour of intense cycling. Further improvements in performance were found when exercise was preceded by a CHO meal 4 h prior to exercise in combination with a solid CHO feeding given immediately before exercise.
| Identifer | oai:union.ndltd.org:BSU/oai:cardinalscholar.bsu.edu:handle/183335 |
| Date | January 1986 |
| Creators | Neufer, P. Darrell |
| Contributors | Costill, David L. |
| Source Sets | Ball State University |
| Detected Language | English |
| Format | vii, 39 leaves : ill. ; 28 cm. |
| Source | Virtual Press |
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