A Change of the Nutrition Strategy Leads to an Improved Time-Trial Performance: a Randomized Cross-Over Study

作者：Hottenrott K^*; Kraus M; Neumann G; Schulze S

来源：Deutsche Zeitschrift fur Sportmedizin, 2012, 63(10): 298-304.

DOI：10.5960/dzsm.2012.031

• Endurance performance
• cycling
• competition diet
• fluid intake
• carbohydrates
• nutrition strategy

The study examined whether or not an athletes self-chosen nutrition (A), compared to a scientifically determined strategy (S), leads to differences in performance in a 40-mile time-trial (TT) after a 2h 30 min endurance exercise (EE). Eighteen cyclists (16 men and 2 women; age: 34.4 +/- 9.8 yr; VO(2)max: 54.9 +/- 8.0 [ml.min(-1).kg(-1)]) were tested using a randomised crossover-design at intervals of two weeks, following either A or S. For S, athletes ingested a drink (EE: 274.5 +/- 29.2 ml: TT: 195.1 +/- 57.4 ml) composed of carbohydrates (EE: 26.0 +/- 2.7 g: TT: 18.6 +/- 5.4 g), electrolytes (NaCl EE: 187.9 +/- 19.7 mg: TT: 133.8 +/- 39.0 mg) and caffeine (EE.: 27.7 +/- 3.4 mg: TT: 11.6 +/- 3.4 mg) every 15 min. In S, the athletes completed TT faster (128 +/- 11 min versus 136 +/- 13 min: p <= 0.001) and with a significantly higher power output (212 watts versus 184 watts: p <= 0.001). Adhering to S, athletes completed the 10-mile sections faster right from the start. The intake of fluid, energy (carbohydrate-, mono- and disaccharide) and sodium was significantly higher in S than in A (p <= 0.001) during EE. In TT, only sodium intake was significantly higher in S (p <= 0.001). In conclusion, a scientifically proven nutrition leads to improved performance in prolonged endurance efforts.

• 出版日期2012