Effect of short- and long-term strength exercise on cardiac oxidative stress and performance in rat |
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Authors: | Nasser Ahmadiasl Hamid Najafipour Farhad Ghadiri Soufi Afshar Jafari |
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Institution: | (1) Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran;(2) Physiology Research Center, Kerman University of Medical Sciences, Boulevard Jihad, Ebne-Sina Avenue, 7619813159 Kerman, Iran |
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Abstract: | Increase in heart metabolism during severe exercise facilitates production of ROS and result in oxidative stress. Due to shortage
of information, the effect of chronic strength exercise on oxidative stress and contractile function of the heart was assessed
to explore the threshold for oxidative stress in this kind of exercise training. Male Wistar rats (80) were divided into two
test groups exercised 1 and 3 months and two control groups without exercise. Strength exercise was carried by wearing a Canvas
Jacket with weights and forced rats to lift the weights. Rats were exercised at 70% of maximum lifted weight 6 days/week,
four times/day, and 12 repetitions each time. Finally, the hearts of ten rats/group were homogenized and MDA, SOD, GPX, and
catalase (CAT) were determined by ELISA method. In other ten rats/group, left ventricle systolic and end diastolic pressures
(LVSP and LVEDP) and contractility indices (LVDP and +dp/dt max) and relaxation velocity (−dp/dt max) were recorded. The coronary
outflow was collected. Short- and long-term strength exercise increased heart weight and heart/BW ratio (P < 0.05). In the 3-month exercise group, basal heart rate decreased (P < 0.05). LVEDP did not change but LVDP, +dp/dt max, −dp/dt max, and coronary flow significantly increased in both exercise
groups (P < 0.05). None of MDA or SOD, GPX, and CAT significantly changed. The results showed that sub-maximal chronic strength exercise
improves heart efficiency without increase in oxidative stress index or decrease in antioxidant defense capacity. These imply
that long-time strength exercise up to this intensity is safe for cardiac health. |
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