Reduced exercise time in competitive simulations consequent to low level ozone exposure

Area of Science:

• Environmental Health
• Sports Science
• Pulmonary Physiology

Background:

• Ozone (O3) is a common air pollutant, particularly in urban environments during warmer months.
• Understanding the impact of low-level ozone exposure on athletic performance is crucial for athlete health and training strategies.

Purpose of the Study:

• To investigate the effects of varying low ozone concentrations on simulated competitive endurance performance.
• To assess associated physiological changes and subjective symptom responses in elite athletes.

Main Methods:

• Ten highly trained endurance athletes underwent simulated 1-hour cycling protocols.
• Subjects were exposed to filtered air (FA) and three different ozone concentrations (0.12, 0.18, 0.24 ppm) in a randomized manner.
• Performance was measured by the ability to complete intense workloads, alongside pulmonary function tests and symptom reporting.

Main Results:

• A dose-dependent increase in the inability to complete the endurance test was observed with rising ozone levels.
• Significant decrements in forced vital capacity and forced expiratory volume in 1 second were noted at 0.18 and 0.24 ppm ozone.
• Subjective symptoms and the difficulty of exercise increased significantly with ozone exposure.

Conclusions:

• Low-level ozone exposure, common in metropolitan areas, significantly impairs endurance performance and pulmonary function in elite athletes.
• These findings highlight the potential risks of air pollution for athletic endeavors and necessitate consideration in training and competition planning.
• Ozone exposure leads to reduced exercise capacity and increased respiratory discomfort, even at concentrations typically encountered outdoors.