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Acute Soy Supplementation Improves 20-km Time Trial Performance, Power, and Speed
Afton D Seeley1, Kevin A Jacobs1, Joseph F Signorile2
1Laboratory of Clinical and Applied Physiology, University of Miami, Coral Gables, FL.
Medicine and Science in Sports and Exercise
|July 26, 2019
Summary
Fermented soy extract supplementation improved cycling performance, increasing power and speed. Elite athletes experienced greater benefits, with soy potentially reducing cardiac strain during intense exercise.
Area of Science:
- Exercise Physiology
- Nutritional Science
- Sports Medicine
Background:
- Isoflavones, found in soy products, are phytoestrogens with potential estradiol-like biological functions.
- Isoflavones may enhance vascular endothelial relaxation and improve limb blood flow, possibly via estrogen receptors.
Purpose of the Study:
- To investigate the effects of acute fermented soy extract supplementation on 20-km cycling time trial performance.
- To assess the impact of soy supplementation on cardiac hemodynamics during a cycling time trial compared to a placebo.
Main Methods:
- Twenty-five trained cyclists and triathletes participated in a randomized controlled trial.
- Subjects ingested either a fermented soy extract supplement or a placebo before completing two 20-km cycling time trials.
Main Results:
- Soy supplementation resulted in a faster 20-km time, increased power output, and higher speed in the final 5 km.
- Higher fitness level athletes showed the most significant performance improvements and a reduction in heart rate.
Conclusions:
- Acute fermented soy extract supplementation enhances cycling performance, particularly in power and speed.
- Soy supplementation may offer cardiovascular benefits, reducing cardiac demand in highly fit individuals during strenuous exercise.
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