Rapid carbohydrate loading after a short bout of near maximal-intensity exercise

被引:32
作者
Fairchild, TJ [1 ]
Fletcher, S [1 ]
Steele, P [1 ]
Goodman, C [1 ]
Dawson, B [1 ]
Fournier, PA [1 ]
机构
[1] Univ Western Australia, Dept Human Movement & Exercise Sci, Crawley, WA 6009, Australia
关键词
glycogen; muscle fiber; periodic acid-schiff;
D O I
10.1097/00005768-200206000-00012
中图分类号
G8 [体育];
学科分类号
04 ; 0403 ;
摘要
FAIRCHILD, T. J., S. FLETCHER, P. STEELE, C. GOODMAN, B. DAWSON, and P. A. FOURNIER. Rapid carbohydrate loading after a short bout of near maximal-intensity exercise. Med. Sci. Sports Exerc., Vol. 34. No. 6, pp. 980-986. 2002. Purpose: One limitation shared by all Published carbohydrate-loading regimens is that 2-6 d are required for the attainment of supranormal muscle glyco-en levels. Because high rates of glycogen resynthesis are reported during recovery from exercise of near-maximal intensity and that these rates could in theory allow muscle to attain suptanormal glycogen levels in less than 24 h. the purpose of this study was to examine whether a combination of a short bout of high-intensity exercise with I d of a high-carbohydrate intake offers the basis for an improved carbohydrate-loading regimen. Methods: Seven endurance-trained athletes cycled for 150 s at 130% VO2peak followed by 30 s of all-out cycling. During the following 24 h, each subject was asked to ingest 12 g.kg(-1) of lean body mass (the equivalent of 10.3 g.kg(-1) body mass) of high-carbohydrate foods with a high glycemic index. Results: Muscle glycogen increased from preloading levels (+/- SE) of 109.1 +/- 8.2 to 198.2 +/- 13.1 mmol.kg(-1) wet weight within only 24 h, these levels being comparable to or higher than those reported by others over a 2- to 6-d regimen. Densitometric analysis Of muscle sections stained with periodic acid-Schiff not only corroborated these findings but also indicated that after 24 h of high-carbohydrate intake. glycogen stores reached similar levels in Type I, IIa. and IIb muscle fibers. Conclusion: This study shows that a combination of a short-term bout of high-carbohydrate intake enables athletes to attain supranormal muscle high-intensity exercise followed by a high-carbohydrate intake enables athletes to attain supranormal muscle glycogen levels within only 24 h.
引用
收藏
页码:980 / 986
页数:7
相关论文
共 35 条
[1]  
AHLBORG B, 1967, FORSVARSMEDICIN, V3, P85
[2]   DIET MUSCLE GLYCOGEN AND PHYSICAL PERFORMANCE [J].
BERGSTROM, J ;
HERMANSEN, L ;
HULTMAN, E ;
SALTIN, B .
ACTA PHYSIOLOGICA SCANDINAVICA, 1967, 71 (2-3) :140-+
[3]  
BLOOMFIELD J, 1994, APPL ANATOMY BIOMECH, P306
[4]  
Brau L, 1997, BIOCHEM J, V322, P303
[5]  
BURKE LM, 1987, CAN J SPORT SCI, V12, P6
[6]   Carbohydrate loading failed to improve 100-km cycling performance in a placebo-controlled trial [J].
Burke, LM ;
Hawley, JA ;
Schabort, EJ ;
Gibson, ASC ;
Mujika, I ;
Noakes, TD .
JOURNAL OF APPLIED PHYSIOLOGY, 2000, 88 (04) :1284-1290
[7]   A comparison of skeletal muscle oxygenation and fuel use in sustained continuous and intermittent exercise [J].
Christmass, MA ;
Dawson, B ;
Passeretto, P ;
Arthur, PG .
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY, 1999, 80 (05) :423-435
[8]   IMPAIRED MUSCLE GLYCOGEN-STORAGE AFTER MUSCLE BIOPSY [J].
COSTILL, DL ;
PEARSON, DR ;
FINK, WJ .
JOURNAL OF APPLIED PHYSIOLOGY, 1988, 64 (05) :2245-2248
[9]  
EVANS WJ, 1982, MED SCI SPORT EXER, V14, P101
[10]  
FERREIRA LD, 2001, AM J PHYSIOL, V280, pF83