Acute Exercise and Oxidative Stress: CrossFit(™) vs. Treadmill Bout

Area of Science:

• Exercise Physiology
• Biochemistry
• Sports Science

Background:

• CrossFit(™) is a high-intensity training modality with debated health and injury risks.
• Empirical evidence on the acute physiological stress, specifically oxidative stress, from CrossFit(™) is limited.
• Understanding the redox response to CrossFit(™) is crucial for assessing its physiological impact.

Purpose of the Study:

• To investigate the acute redox response following a single bout of CrossFit(™).
• To compare the oxidative stress markers of CrossFit(™) with those of high-intensity treadmill running.
• To analyze changes in oxidative damage and antioxidant capacity post-exercise.

Main Methods:

• Ten male participants with at least three months of CrossFit(™) experience were recruited.
• Blood plasma was collected at pre-exercise, immediately post-exercise, 1 hour post, and 2 hours post-exercise.
• Key biomarkers measured included lipid peroxides, protein carbonyls, Ferric Reducing Antioxidant Power (FRAP), and Total Enzymatic Antioxidant Capacity (TEAC).

Main Results:

• Both CrossFit(™) and treadmill running significantly increased lipid peroxides and FRAP, with comparable time-dependent responses.
• Protein carbonyls showed an initial increase post-CrossFit(™) but decreased over time, similar to treadmill running.
• Total Enzymatic Antioxidant Capacity decreased post-exercise for both modalities, with no significant trial-dependent differences observed.

Conclusions:

• A single bout of CrossFit(™) induces an acute blood oxidative stress response comparable to high-intensity treadmill running.
• Exercise intensity and recovery time significantly influence the oxidative stress response.
• The findings suggest that CrossFit(™) does not impose a uniquely higher oxidative stress burden compared to traditional high-intensity exercise.