伪麻黄碱对最大骑行功率和次最大骑行效率的影响。
Effects of pseudoephedrine on maximal cycling power and submaximal cycling efficiency.
作者信息
Hodges Alastair N H, Lynn Brenna M, Bula Jonathan E, Donaldson Meghan G, Dagenais Marc O, McKenzie Donald C
机构信息
Allan McGavin Sports Medicine Centre and School of Human Kinetics, University of British Columbia, Vancouver, British Columbia, Canada.
出版信息
Med Sci Sports Exerc. 2003 Aug;35(8):1316-9. doi: 10.1249/01.MSS.0000078925.30346.F8.
PURPOSE
To study the effects of a therapeutic dose of pseudoephedrine on anaerobic cycling power and aerobic cycling efficiency.
METHODS
Eleven healthy moderately trained males (VO (2peak) 4.4 +/- 0.8 L x min(-1) participated in a double-blinded crossover design. Subjects underwent baseline (B) tests for anaerobic (Wingate test) and aerobic (VO (2peak) test) cycling power. Subjects ingested either 60 mg of pseudoephedrine hydrochloride (D) or a placebo (P) and, after 90 min of rest, a Wingate and a cycling efficiency test were performed. During the cycling efficiency test, heart rate (HR) and VO(2) were averaged for the last 5 min of a 10-min cycle at 40% and 60% of the peak power achieved during the VO (2peak) test.
RESULTS
There were no significant differences in peak power (B = 860 +/- 154, D = 926 +/- 124, P = 908 +/- 118 W), total work (B = 20 +/- 3, D = 21 +/- 3, P = 21 +/- 3 kJ), or fatigue index (B = 39 +/- 8, D = 45 +/- 5, P = 43 +/- 5%). There were no significant differences in HR at 40% power (D = 138 +/- 10, P = 137 +/- 10 beats.min-1) or 60% power (D = 161 +/- 11, P = 160 +/- 11 beats x min(-1). There were no significant differences in cycling efficiency at 40% power (D = 18.8 +/- 1.8, P = 18.5 +/- 1.8%) or 60% power (D = 20.3 +/- 2.0, P = 20.1 +/- 2.1%).
CONCLUSION
A therapeutic dose of pseudoephedrine hydrochloride does not affect anaerobic cycling performance or aerobic cycling efficiency.
目的
研究治疗剂量的伪麻黄碱对无氧骑行功率和有氧骑行效率的影响。
方法
11名健康的中度训练男性（VO₂峰值为4.4±0.8 L·min⁻¹）参与了双盲交叉设计。受试者进行了无氧（温盖特测试）和有氧（VO₂峰值测试）骑行功率的基线（B）测试。受试者摄入60毫克盐酸伪麻黄碱（D）或安慰剂（P），休息90分钟后，进行温盖特测试和骑行效率测试。在骑行效率测试期间，在VO₂峰值测试中达到的峰值功率的40%和60%下，对10分钟骑行的最后5分钟的心率（HR）和VO₂进行平均。
结果
峰值功率（B = 860±154，D = 926±124，P = 908±118 W）、总功（B = 20±3，D = 21±3，P = 21±3 kJ）或疲劳指数（B = 39±8，D = 45±5，P = 43±5%）无显著差异。40%功率时的心率（D = 138±10，P = 137±10次·min⁻¹）或60%功率时的心率（D = 161±11，P = 160±11次·min⁻¹）无显著差异。40%功率时的骑行效率（D = 18.8±1.8，P = 18.5±1.8%）或60%功率时的骑行效率（D = 20.3±2.0，P = 20.1±2.1%）无显著差异。
结论
治疗剂量的盐酸伪麻黄碱不影响无氧骑行性能或有氧骑行效率。
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