Effect of Carbohydrate Supplementation Type on Endurance Cycling Performance in Competitive Athletes

This study compared a training diet recommended for endurance athletes (H-CHO) with an isoenergetic high protein (whey supplemented), moderate carbohydrate (H-Pro) diet on endurance cycling performance. Over two separate 7-d periods subjects (n = 7) ingested either H-CHO (7.9 ± 1.9 g · kg−1 · d−1 carbohydrate; 1.2 ± 0.3 g · kg−1 · d−1 fat; 1.3 ± 0.4 g · kg−1 · d−1 protein) or H-Pro (4.9 ± 1.8 g · kg−1 · d−1; 1.2 ± 0.3 g · kg−1 · d−1; 3.3 ± 0.4 g · kg−1 · d−1) diet in a randomized, balanced order. On day 8 subjects cycled (self-paced) for a body weight dependent (60 kJ/bm) amount of work. No differences occurred between energy intake (P = 0.422) or fat intake (P = 0.390) during the two dietary conditions. Performance was significantly (P = 0.010) impaired following H-Pro (153 ± 36) compared with H-CHO (127 ± 34 min). No differences between treatments were observed for physiological measures taken during the performance trials. These results indicate an ergolytic effect of a 7-d high protein diet on self-paced endurance cycling performance.

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Does Sex Mediate the Effects of Caffeine on Endurance Cycling Performance?

Medicine & Science in Sports & Exercise ◽

10.1249/01.mss.0000495716.01290.c8 ◽

2014 ◽

Vol 46 ◽

pp. 740-741

Author(s):

Tina L. Skinner ◽

Ben Desbrow ◽

Mia A. Schaumberg ◽

John Osborne ◽

Gary D. Grant ◽

...

Keyword(s):

Cycling Performance ◽

Endurance Cycling

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Drink-Flavor Change’s Lack of Effect on Endurance Cycling Performance in Trained Athletes

International Journal of Sport Nutrition and Exercise Metabolism ◽

10.1123/ijsnem.17.4.315 ◽

2007 ◽

Vol 17 (4) ◽

pp. 315-327 ◽

Cited By ~ 6

Author(s):

Ben Desbrow ◽

Clare Minahan ◽

Michael Leveritt

Keyword(s):

Perceived Exertion ◽

Time Trial ◽

Cycling Performance ◽

Rating Of Perceived Exertion ◽

Controlled Trials ◽

Exercise Protocol ◽

Male Athletes ◽

Subsequent Performance ◽

Sports Drink ◽

Endurance Cycling

This study investigated whether a change in beverage favor during endurance cycling improves subsequent performance. Eight trained male athletes (age 24.3 ± 3.9 y, weight 74.7 ± 6.0 kg, peak O2 uptake [VO2peak] 65.4 ± 5.4 mL·kg−1·min−1; mean ± SD) undertook 3 trials, with training and diet being controlled. Trials consisted of 120 min of steady-state (SS) cycling at ~70% VO2peak, immediately followed by a 7-kJ/kg time trial (TT). During exercise subjects were provided with fluids every 20 min. After 80 min of SS cycling subjects either continued drinking the same-favor sports drink or changed to an alternate favor—either an alternate-favor sports drink (AFSD) or cola. All beverages were carbohydrate and volume matched. Changing drink favor caused no significant change in TT time (sports drink 27:16 ± 03:12, AFSD 27:06 ± 03:16, cola 27:03 ± 02:42; min: s). The various favors produced no treatment effects on heart rate, blood glucose, or rating of perceived exertion throughout the SS exercise protocol. The influence of other taste variables such as palatability, bitterness, or timing of favor change on endurance-exercise performance requires more rigorous investigation.

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