{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T06:30:31Z","timestamp":1790145031003,"version":"4.0.1"},"reference-count":24,"publisher":"BMJ","issue":"2","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Br J Sports Med"],"published-print":{"date-parts":[[2007,2]]},"abstract":"<jats:p><jats:bold>Aim:<\/jats:bold>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.<\/jats:p><jats:p><jats:bold>Methods:<\/jats:bold>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.<\/jats:p><jats:p><jats:bold>Results:<\/jats:bold>The motocross heat resulted in an increase in plasma oxidative stress and damage (p&lt;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&lt;0.05). Blood neutrophil counts increased at 0 and 1 h after exercise (p&lt;0.05). Lymphocyte count increased from baseline to 0 h, although it decreased from baseline and 0 to 1 h after exercise (p&lt;0.05).<\/jats:p><jats:p><jats:bold>Conclusion:<\/jats:bold>The data reinforce the marked metabolic and hormonal demands imposed by motocross, resulting in a condition of enhanced plasma oxidative stress and damage.<\/jats:p>","DOI":"10.1136\/bjsm.2006.031591","type":"journal-article","created":{"date-parts":[[2006,12,1]],"date-time":"2006-12-01T01:34:12Z","timestamp":1164936852000},"page":"101-105","source":"Crossref","is-referenced-by-count":29,"title":["Effect of off-road competitive motocross race on plasma oxidative stress and damage markers"],"prefix":"10.1136","volume":"41","author":[{"given":"Ant\u00f3nio","family":"Ascens\u00e3o","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rita","family":"Ferreira","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Franklim","family":"Marques","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eduardo","family":"Oliveira","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Victor","family":"Azevedo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jos\u00e9","family":"Soares","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jos\u00e9","family":"Magalh\u00e3es","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"239","published-online":{"date-parts":[[2006,11,30]]},"reference":[{"key":"2024051312570294000_41.2.101.1","doi-asserted-by":"publisher","DOI":"10.1136\/bjsm.2005.018291"},{"key":"2024051312570294000_41.2.101.2","doi-asserted-by":"crossref","first-page":"132","DOI":"10.1055\/s-2007-1021034","volume":"15","year":"1994","journal-title":"Int J Sports Med"},{"key":"2024051312570294000_41.2.101.3","doi-asserted-by":"publisher","DOI":"10.1016\/0003-2697(69)90064-5"},{"key":"2024051312570294000_41.2.101.4","doi-asserted-by":"crossref","unstructured":"Hu M-L. 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