Effect of niacin-bound chromium supplement on sprint performance following endurance exercise in cyclists

• Main Authors: Liu, Chao Yin, 劉昭吟
• Other Authors: Wang, Ho Seng
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/80470590251528109164

碩士 === 國立臺灣師範大學 === 體育學系 === 99 === Purpose: The purpose of this study was to investigate the effect of niacin-bound chromium (NBC) supplement on sprint performance following 90 min of endurance exercise in cyclists. Methods: Ten trained cyclist participated in three exercise trials on Cyclus2 stationary ergometer. Each exercise trial was performed at least one week apart. Following a double-blind, crossover design, the subjects cycled at 70% O2max for 90 minutes and then immediately performed 30s Wingate Anaerobic Power Test (WAPT) to measure mean power, peak power, time to peak power, fatigue index, RPE. Subjects received supplement 0.2g/kg carbohydrate beverage (CHO trial), a CE beverage containing 200µg NBC (CHOCr trial), or placebo (PLAC trial) at 0, 20, 40, 60 and 80 min during each exercise trial. Blood glucose and lactate concentrations were determined from finger blood at resting, 15, 75 min during exercise, and at 3 min post-WAPT. Result: Peak power was significantly different between trials, CHOCr trial (746.04 ± 90.32 W) > CHO trial (721.63 ± 75.35 W) > placebo trial (674.13±94.79 W) (p <.05), but only CHOCr trial (631.39±41.73 W) significantly higher than placebo trial (583.02 ± 53.51 W) in mean power (p <.05). RPE was significantly lower in CHOCr trial and CHO trial than placebo trial (p <.05). Blood glucose was significantly higher in CHO trial than placebo trial (p <.05). Conclusion: NBC combined with carbohydrate supplement may attenuate mental fatigue, and even improve blood glucose utilization and sprint performance following endurance exercise in cyclists.