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The effects of acute exercise on neutrophils and plasma oxidative stress
John C Quindry1, William L Stone, Jeff King
1Department of Exercise and Sport Sciences and Physiology, Center for Exercise Science University of Florida, Gainesville, FL, USA.
Purpose:
To investigate the influence of intensity versus total energy expenditure on neutrophilia and blood oxidative stress to acute exercise.
Methods:
Nine males (18-30 yr) completed one maximal (Max) and three submaximal exercise sessions: 1) 45 min at 10% above (LT+) lactate threshold (LT), 2) 45 min at 10% below (LT-) LT, and 3) 10% below LT until caloric expenditure equaled the 10%+ trial (LT-kcal). Blood was sampled before (PRE), immediately (POST), 1 h, and 2 h after exercise to measure neutrophils, myeloperoxidase, superoxide (O(2)-), neutrophil activation (O(2)-/neutrophils), ascorbic acid, uric acid, malondialdehyde, and lipid hydroperoxides.
Results:
Intensity-dependent neutrophilia occurred POST exercise with significant increases (P
Conclusion:
Exercise intensity plays a major role in postexercise blood oxidative stress, whereas total exercise energy expenditure does not. Further, neutrophils recruited into circulation during exercise may impose a threshold dependent oxidative stress in blood plasma after exercise.