2011
DOI: 10.1007/s00421-011-1831-5
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Combined carbohydrate–protein supplementation improves competitive endurance exercise performance in the heat

Abstract: Laboratory-based studies have demonstrated that adding protein (PRO) to a carbohydrate (CHO) supplement can improve thermoregulatory capacity, exercise performance and recovery. However, no study has investigated these effects in a competitive sporting context. This study assessed the effects of combined CHO-PRO supplementation on physiological responses and exercise performance during 8 days of strenuous competition in a hot environment. Twenty-eight cyclists participating in the TransAlp mountain bike race w… Show more

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Cited by 16 publications
(17 citation statements)
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“…Study with trained cyclists verified that those who received CHO+PTN supplementation in an interval activity characterized by 45 to 75% of the Maximum Oxygen Consumption (VO2Max) with 3 hours of duration obtained a longer time to exhaustion (TTE) in a subsequent activity to 85% VO2Max when compared to groups that received only CHO or placebo (PLA) [9]. In line of this, other studies also found an improvement in performance after the addition of PTN in the CHO supplement [10,11,12]. On the other hand, other authors [13,14,15] did not observe improvement in the performance of individuals who received CHO+PTN supplementation.…”
Section: Introductionsupporting
confidence: 62%
See 1 more Smart Citation
“…Study with trained cyclists verified that those who received CHO+PTN supplementation in an interval activity characterized by 45 to 75% of the Maximum Oxygen Consumption (VO2Max) with 3 hours of duration obtained a longer time to exhaustion (TTE) in a subsequent activity to 85% VO2Max when compared to groups that received only CHO or placebo (PLA) [9]. In line of this, other studies also found an improvement in performance after the addition of PTN in the CHO supplement [10,11,12]. On the other hand, other authors [13,14,15] did not observe improvement in the performance of individuals who received CHO+PTN supplementation.…”
Section: Introductionsupporting
confidence: 62%
“…Some authors proposed an initial exercise protocol with a much longer time (≥ 120 minutes) and an intensity for the athletes to reach exhaustion at the end of exercise much lower (80 to 85% VO2Max) [9,11,12] when compared to the present study (60 minutes and 90% VO2Max, respectively). Another study [10] that also showed a positive effect on protein addition used this intervention in a chronic way (for 8 days) with ad libitum intake of the supplement making it difficult to compare with our research. Possible explanations for this fact are that prolonged exercises require a greater contribution of PTN as an energy source [32] whereas activities with intensities above AT use predominantly CHO to produce ATP through the oxidation of glucose by glycolytic pathway [33].…”
Section: Discussionmentioning
confidence: 62%
“…Saunders et al [42] found the use of a fluid replacement drink fortified with protein during a two cycle-to-exhaustion tests within the same day was effective in attenuating the nutritional deficit incurred during exercise and helped to reduce skeletal muscle damage compared to a carbohydrate electrolyte drink alone. Therefore, performing multiple bouts of exercise within a day or consecutive days of competition may be necessary to fully observe the nutritional and physiologic effects of protein ingested with a carbohydrate electrolyte beverage during exercise [43]. …”
Section: Discussionmentioning
confidence: 99%
“…RER was consistently higher in the CHO-PRO condition than the other conditions and mean heart rate was consistently lower in CHO condition compared to the others. Conversely, Cathcart et al did observe differences in endurance performance after randomizing 28 competitive mountain bikers to either CHOonly (control) supplements or CHO-PRO supplements [27]. Overall, those consuming the CHO-PRO supplement performed significantly faster than the placebo.…”
Section: Carbohydrate Vs Proteinmentioning
confidence: 94%