Effect of off-road competitive motocross race on plasma oxidative stress and damage markers

• Type: Article in International Scientific Journal
• Date: 2007

Authors

Antonio Ascensao (Author) FADEUP; Rita Ferreira (Author) Other; Franklim Marques (Author) FFUP; Eduardo Oliveira (Author) Other; Victor Azevedo (Author) Other; Jose Soares (Author) Other; Jose Magalhaes (Author) FADEUP

Journal

Title: British Journal of Sports Medicine

Vol. 41 No. 2

Pages: 101-105

ISSN: 0306-3674

Publisher: BMJ PUBLISHING GROUP

Indexing

ISI Web of Knowledge - 20 Citations

Scopus - 28 Citations

Pubmed / Medline

Sport Discus

Scientific classification

FOS: Medical and Health sciences > Health sciences

Other information

Authenticus ID: P-004-BXF

DOI: 10.1136/bjsm.2006.031591

Abstract (EN): Aim: To analyse the effect of an off-road motocross heat on plasma levels of oxidative stress and damage, blood leucocyte counts and urine catecholamine concentration. Methods: Plasma contents of total, reduced and oxidised (GSSG) glutathione, %GSSG, malondialdehyde (MDA), protein carbonyl and sulphydryl groups, total antioxidant status (TAS), uric acid, and blood neutrophil and lymphocyte counts were evaluated in 10 male top-level riders before, immediately after (0 h) and 1 h after a simulated competitive motocross race. 24-h urine adrenaline, noradrenaline and dopamine concentrations were also measured. Results: The motocross heat resulted in an increase in plasma oxidative stress and damage (p < 0.05). This was shown by a significant increase in %GSSG, TAS, MDA and carbonyls, and by a decrease in sulphydryl groups after the race. There was a significant increase in both plasma uric acid and urine catecholamine concentration after the race (p < 0.05). Blood neutrophil counts increased at 0 and 1 h after exercise (p < 0.05). Lymphocyte count increased from baseline to 0 h, although it decreased from baseline and 0 to 1 h after exercise (p < 0.05). Conclusion: The data reinforce the marked metabolic and hormonal demands imposed by motocross, resulting in a condition of enhanced plasma oxidative stress and damage.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 5