PMID- 6748917
OWN - NLM
STAT- MEDLINE
DCOM- 19840912
LR  - 20081121
IS  - 0195-9131 (Print)
IS  - 0195-9131 (Linking)
VI  - 16
IP  - 3
DP  - 1984 Jun
TI  - Effect of carbohydrate feedings on muscle glycogen utilization and exercise 
      performance.
PG  - 219-22
AB  - Ten men were studied during 4 h of cycling to determine the effect of solid 
      carbohydrate (CHO) feedings on muscle glycogen utilization and exercise 
      performance. In the experimental trial (E) the subjects ingested 43 g of sucrose 
      in solid form along with 400 ml of water at 0, 1, 2 and 3 h of exercise. During 
      the control trial (C) they received 400 ml of an artificially sweetened drink 
      without solid CHO. No differences in VO2, heart rate, or total energy expenditure 
      were observed between trials; however, respiratory exchange ratios were 
      significantly (P less than 0.05) higher during E. Blood glucose was significantly 
      (P less than 0.05) elevated 20 min post-feeding in E; however, by 50 min no 
      differences were observed between trials until 230 min (E = 4.5 +/- 0.2 mmol X 
      l-1 vs C = 3.9 +/- 0.2, means +/- SE; P less than 0.05). Muscle glycogen 
      utilization was significantly (P less than 0.05) lower during E (100.7 +/- 10.2 
      mmol X kg-1 w.w.) than C (126.2 +/- 5.5). During a sprint (100% VO2max) ride to 
      exhaustion at the end of each trial, subjects performed 45% longer when fed CHO 
      (E = 126.8 +/- 24.7 s vs C = 87.2 +/- 17.5; P less than 0.05). It was concluded 
      that repeated solid CHO feedings maintain blood glucose levels, reduce muscle 
      glycogen depletion during prolonged exercise, and enhance sprint performance at 
      the end of such activity.
FAU - Hargreaves, M
AU  - Hargreaves M
FAU - Costill, D L
AU  - Costill DL
FAU - Coggan, A
AU  - Coggan A
FAU - Fink, W J
AU  - Fink WJ
FAU - Nishibata, I
AU  - Nishibata I
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - Med Sci Sports Exerc
JT  - Medicine and science in sports and exercise
JID - 8005433
RN  - 9005-79-2 (Glycogen)
SB  - IM
MH  - Adult
MH  - *Carbohydrate Metabolism
MH  - Glycogen/*metabolism
MH  - Humans
MH  - Male
MH  - Muscles/*metabolism
MH  - *Physical Exertion
OID - NASA: 84269851
EDAT- 1984/06/01 00:00
MHDA- 1984/06/01 00:01
CRDT- 1984/06/01 00:00
PHST- 1984/06/01 00:00 [pubmed]
PHST- 1984/06/01 00:01 [medline]
PHST- 1984/06/01 00:00 [entrez]
PST - ppublish
SO  - Med Sci Sports Exerc. 1984 Jun;16(3):219-22.