Effects of a Short-Term High-Nitrate Diet on Exercise Performance

Area of Science:

• Sports Science
• Nutritional Physiology
• Biochemistry

Background:

• Nitrate supplementation, often via beetroot juice or sodium nitrate, is known to improve exercise performance.
• Limited research exists on the ergogenic effects of increased dietary nitrate intake from whole foods like fruits and vegetables.

Purpose of the Study:

• To determine if a high-nitrate diet increases nitric oxide bioavailability.
• To evaluate the impact of a high-nitrate diet on exercise performance in healthy males.

Main Methods:

• Randomized cross-over study involving seven healthy male subjects.
• Dietary intervention with a high-nitrate diet (HND) or control diet (CD) for six days.
• Measurement of plasma nitrate and nitrite concentrations, oxygen consumption, muscle work, and sprint performance.

Main Results:

• Plasma nitrate and nitrite levels were significantly elevated following the HND compared to the CD.
• The HND resulted in reduced oxygen consumption during moderate-intensity cycling.
• The HND led to increased muscle work during fatiguing isometric knee extensions and improved repeated sprint ability.

Conclusions:

• A high-nitrate diet effectively increases nitric oxide bioavailability.
• This dietary strategy enhances exercise efficiency and performance.
• A diet rich in fruits and vegetables offers a feasible and effective method for nitrate supplementation to improve athletic capabilities.