Abstract
This study examined the influence of 3-day isoenergetic carbohydrate (CHO) loading
with different glycemic index (GI) and glycemic load (GL) meals on running performance
and metabolic responses. With a randomized crossover design, nine male runners performed
a 1-h run at 70 % V·O2max followed by a 10-km performance run after a 3-day diet adaptation, which involved
different GI and GL meals [CHO intake (%), GI, and GL per day were 73 %, 80, and 553
for the high GI and high GL (HH); 73 %, 36, and 249 for the low GI and low GL (LL);
and 31 %, 79, and 227 for the high GI and low GL (HL), respectively]. There were no
differences in the time to complete the 10-km run between the two high-CHO trials;
however, the performance in the LL trial was improved as compared to that in the HL
trial (mean ± SEM: HH vs. LL vs. HL: 51.3 ± 5.3 vs. 48.6 ± 1.3 vs. 55.3 ± 6.9 min).
It appears that the amount, rather than the nature, of the CHO consumed during the
3-day isoenergetic CHO loading may be the most overriding factor on subsequent metabolism
and endurance run performance.
Key words
glycemic index - glycemic load - run performance - metabolism
References
- 1
Andrews J L, Sedlock D A, Flynn M G, Navalta J W, Ji H.
Carbohydrate loading and supplementation in endurance-trained women runners.
J Appl Physiol.
2003;
95
584-590
- 2
Bishop N C, Walsh N P, Haines D L, Richards E E, Gleeson M.
Pre-exercise carbohydrate status and immune responses to prolonged cycling: I. Effect
on neutrophil degranulation.
Int J Sport Nutr Exerc Metab.
2001;
11
490-502
- 3
Bogardus C, Thuillez P, Ravussin E, Vasquez B, Narimiga M, Azhar S.
Effect of muscle glycogen depletion on in vivo insulin action in man.
J Clin Invest.
1983;
72
1605-1610
- 4
Bosher K J, Potteiger J A, Gennings C, Luebbers P E, Shannon K A, Shannon R M.
Effects of different macronutrient consumption following a resistance-training session
on fat and carbohydrate metabolism.
J Strength Cond Res.
2004;
18
212-219
- 5
Brooks G A, Butterfield G E, Wolfe R R, Groves B M, Mazzeo R S, Sutton J R, Wolfel E E,
Reeves J T.
Decreased reliance on lactate during exercise after acclimatization to 4300 m.
J Appl Physiol.
1991;
71
333-341
- 6
Burke L M, Gregory C R, Hargreaves M.
Muscle glycogen storage after prolonged exercise: effect of the glycemic index of
carbohydrate feedings.
J Appl Physiol.
1993;
75
1019-1023
- 7
Burke L M, Hawley J A, Schabort E J, St Clair Gibson A, Mujika I, Noakes T D.
Carbohydrate loading failed to improve 100-km cycling performance in a placebo-controlled
trial.
J Appl Physiol.
2000;
88
1284-1290
- 8
Chen Y J, Wong S H, Wong C K, Lam C W, Huang Y J, Siu P M.
Effect of pre-exercise meals with different glycemic indices and glycemic loads on
metabolic responses and endurance running performance.
Med Sci Sports Exerc.
2006;
38
S37
- 9
Doyle J A, Martinez A L.
Reliability of a protocol for testing endurance performance in runners and cyclists.
Res Q Exerc Sport.
1998;
69
304-307
- 10
Chryssanthopoulos C, Williams C, Wilson W, Asher L, Hearne L.
Comparison between carbohydrate feedings before and during exercise on running performance
during a 30-km treadmill time trial.
Int J Sport Nutr.
1994;
4
374-386
- 11
Coggan A R, Coyle E F.
Reversal of fatigue during prolonged exercise by carbohydrate infusion or ingestion.
J Appl Physiol.
1987;
63
2388-2395
- 12
Foster-Powell K, Holt S HA, Brand-Miller J C.
International table of glycemic index and glycemic load values.
Am J Clin Nutr.
2002;
76
5-56
- 13
Goforth Jr H W, Laurent D, Prusaczyk W K, Schneider K E, Petersen K F, Shulman G I.
Effects of depletion exercise and light training on muscle glycogen supercompensation
in men.
Am J Physiol.
2003;
285
E1304-E1311
- 14
Helge J W, Watt P W, Richter E A, Rennie M J, Kiens B.
Fat utilization during exercise: adaptation to a fat-rich diet increases utilization
of plasma fatty acids and very low density lipoprotein-triacylglycerol in humans.
J Appl Physiol.
2001;
15
1009-1020
- 15
Indar-Brown K, Noreberg C, Madar Z.
Glycemic and insulinemic responses after ingestion of ethnic foods by NIDDM and healthy
subjects.
Am J Clin Nutr.
1992;
55
89-95
- 16
Jenkins D JA, Wolever T MS, Taylor R H, Barker H, Fielden H, Baldwin J M, Bowling A C,
Newman H C, Jenkins A L, Goff D V.
Glycaemic index of foods: a physiological basis for carbohydrate exchange.
Am J Clin Nutr.
1981;
34
362-366
- 17
Jentjens R, Cale C, Gutch C, Jeukendrup A.
Effects of pre-exercise ingestion of differing amounts of carbohydrate on subsequent
metabolism and cycling performance.
Eur J Appl Physiol.
2003;
88
444-452
- 18 McArdle W D, Katch F I, Katch V L. Exercise Physiology: Energy, Nutrition, and
Human Performance. 4th edn. Baltimore; Williams & Wilkins 1986
- 19
Mikines K J, Sonne B, Tronier B, Galbo H.
Effects of acute exercise and detraining on insulin action in trained men.
J Appl Physiol.
1989;
66
704-711
- 20
Mittendorfer B, Sidossis L S.
Mechanism for the increase in plasma triacylglycerol concentrations after consumption
of short-term, high-carbohydrate diets.
Am J Clin Nutr.
2001;
73
892-899
- 21
Salmeron J, Manson J E, Stampfer M J, Colditz G A, Wing A L, Willett W C.
Dietary fiber, glycemic load, and risk of non-insulin-dependent diabetes mellitus
in women.
J Am Med Assoc.
1997;
277
472-477
- 22
Schrauwen P, Wagenmakers A J, van Marken Lichtenbelt W D, Saris W H, Westerterp K R.
Increase in fat oxidation on a high-fat diet is accompanied by an increase in triglyceride-derived
fatty acid oxidation.
Diabetes.
2000;
49
640-646
- 23
Sherman W M, Costill D L, Fink W J, Miller J M.
Effect of exercise-diet manipulation on muscle glycogen and its subsequent utilization
during performance.
Int J Sports Med.
1981;
2
114-118
- 24
Sherman W M, Costill D L, Fink W J, Hagerman F C, Armstrong L E, Murray T F.
Effect of a 42.2-km footrace and subsequent rest or exercise on muscle glycogen and
enzymes.
J Appl Physiol.
1983;
55
1219-1224
- 25
Siu P M, Wong S H, Morris J G, Lam C W, Chung P K, Chung S.
Effect of frequency of carbohydrate feedings on recovery and subsequent endurance
run.
Med Sci Sports Exerc.
2004;
36
315-323
- 26
Slyper A, Jurva J, Pleuss J, Hoffmann R, Gutterman D.
Influence of glycemic load on HDL cholesterol in youth.
Am J Clin Nutr.
2005;
81
376-379
- 27
Stevenson E, Williams C, McComb G, Oram C.
Improved recovery from prolonged exercise following the consumption of low glycemic
index carbohydrate meals.
Int J Sport Nutr Exerc Metab.
2005;
15
333-349
- 28
van Loon L J, Saris W H, Kruijshoop M, Wagenmakers A J.
Maximizing postexercise muscle glycogen synthesis: carbohydrate supplementation and
the application of amino acid or protein hydrolysate mixtures.
Am J Clin Nutr.
2000;
72
106-111
- 29
van Loon L J, Greenhaff P L, Constantin-Teodosiu D, Saris W H, Wagenmakers A J.
The effects of increasing exercise intensity on muscle fuel utilisation in humans.
J Physiol.
2001;
536 (Pt 1)
295-304
- 30
Wee S L, Williams C, Gray S, Horabin J.
Influence of high and low glycemic index meals on endurance running capacity.
Med Sci Sports Exerc.
1999;
31
393-399
- 31
Wee S L, Williams C, Tsintzas K, Boobis L.
Ingestion of a high-glycemic index meal increases muscle glycogen storage at rest
but augments its utilization during subsequent exercise.
J Appl Physiol.
2005;
99
707-714
- 32
Williams C, Brewer J, Walker M.
The effect of a high carbohydrate diet on running performance during a 30-km treadmil
time trial.
Eur J Appl Physiol.
1992;
65
18-24
Prof. Stephen H. S. Wong
The Chinese University of Hong Kong
Department of Sports Science and Physical Education
G02, Kwok Sports Building, Shatin, Hong Kong
852 Hong Kong
China
Phone: + 85 2 26 09 60 95
Fax: + 85 2 26 03 57 81
Email: hsswong@cuhk.edu.hk
