本研究目的在探討單次服用何種劑量之紅景天後運動，對有氧能力、延緩產生乳酸及加速消除乳酸較有益處。受試者為臺北市立體育學院曲棍球代表隊14位選手。本實驗採雙盲交叉試驗設計（double-blind and cross-over design），受試者在單次服用紅景天和安慰劑後，接受漸增強度模式的跑步機運動至衰竭，分析其最大攝氧量（VO2 max）、氧脈（O2 pulse），以及運動過程中檢測每一階乳酸（lactate）濃度。研究結果顯示：單次服用低、高劑量組紅景天皆能提升選手最大攝氧量及氧脈，且服用低劑量組較於高劑量組具有較高的最大攝氧量及氧脈；乳酸濃度於單次服用低、高劑量組紅景天均顯著較低。本研究結論為單次服用低劑量紅景天優於高劑量，較能提高運動時心臟輸送氧氣至周邊組織效率，提升有氧能力。服用紅景天對於減少運動中乳酸的產生有立即的功效。

The purpose of this study was designed to explore the differential effects of a single supplementation of Rhodiola rosea with different doses on aerobic performance, delaying lactate production and lactate clearance in hokey players during exercise. In this double-blind cross-over designed study, fourteen hokey players from Taipei Physical Education College were participated as subjects. All subjects performed exercise after a single oral dose of either R. rosea or placebo. The treadmill exercise with increasing intensity to failure was employed in this study. During exercise, the maximal oxygen uptake (VO2 max), oxygen pulse (O2 pulse) and lactate concentrations were measured. We found that single oral intake of low and high doses R. rosea enhances athlete's maximum oxygen uptake and oxygen pulse. In particular, low dose of R. rosea trial presents with a higher maximal oxygen uptake and oxygen pulse compared to high dose trial. Estimated lactate concentration was significantly lower in both trials. These findings conclude that a single low dose of R. rosea supplementation was more capable than high dose to improve the efficiency to carry oxygen from heart to peripheral tissues and to enhance aerobic capacity. Furthermore, R. rosea intake can reduce the production of lactate during exercise.