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Endurance exercise, plasma oxidation and cardiovascular risk

Citation

Sharman, JE and Geraghty, DP and Shing, C and Fraser, DI and Coombes, JS, Endurance exercise, plasma oxidation and cardiovascular risk, Acta Cardiologica: International Journal of Cardiology, 59, (6) pp. 636-642. ISSN 0001-5385 (2004) [Refereed Article]

DOI: doi:10.2143/AC.59.6.2005247

Abstract

Objective - Although physical activity is beneficial to health, people who exercise at high intensities throughout their lifetime may have increased cardiovascular risk. Aerobic exercise increases oxidative stress and may contribute to atherogenesis by augmented oxidation of plasma lipoproteins. The aim of this study was to examine the relationship between aerobic power and markers of oxidative stress, including the susceptibility of plasma to oxidation. Methods and results - Aerobic power was measured in 24 healthy men aged 29 9 years (mean SD). Plasma was analysed from subjects of high aerobic power (HAP; VO2max, 64.6 6.1 ml/kg/min) and lower aerobic power (LAP;VO2max, 45.1 6.3 ml/kg/min) for total antioxidant capacity (TAC), malondialdehyde (MDA) and susceptibility to oxidation. Three measures were used to quantify plasma oxidizability: (I) lag time to conjugated diene formation (lag time); (2) change in absorbance at 234 nm and; (3) slope of the oxidation curve during propagation (slope). The HAP subjects had significantly lower TAG (1.38 0.04 versus 1.42 0.06 TEAC units; P < 0.05), significantly higher change in absorbance (1.55 0.21 versus 1.36 0.17 arbitrary units; P < 0.05), but no difference in MDA (P = 0.6), compared to LAP subjects. There was a significant inverse association between TAC and slope (r = -0.49; P < 0.05). Lipoprotein profiles and daily intake of nutrients did not differ between the groups. Conclusions - These findings suggest that people with high aerobic power, due to extreme endurance exercise, have plasma with decreased antioxidant capacity and higher susceptibility to oxidation, which may increase their cardiovascular risk.

Item Details

Item Type:Refereed Article
Research Division:Medical and Health Sciences
Research Group:Human Movement and Sports Science
Research Field:Exercise Physiology
Objective Division:Health
Objective Group:Public Health (excl. Specific Population Health)
Objective Field:Behaviour and Health
Author:Sharman, JE (Professor James Sharman)
Author:Geraghty, DP (Professor Dominic Geraghty)
Author:Fraser, DI (Mr David Fraser)
ID Code:29975
Year Published:2004
Web of Science® Times Cited:8
Deposited By:Health Sciences A
Deposited On:2004-08-01
Last Modified:2011-05-30
Downloads:0

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