Abstract
Cellular damage caused by free radical reactions may play a role in the aging process. A bout of exercise can increase free radical concentration with damage to mitochondria in muscle (Davies et al., 1982). This study was undertaken to determine if muscle adapts to exercise training with an enhancement of enzymatic defenses against free radical damage. A program of running that induced two-fold increases in mitochondrial enzymes in leg muscles of rats resulted in no increase in catalase or cytoplasmic superoxide dismutase (SOD) activities. Mitochondrial SOD activity was increased 37% in fast-twitch red and slow-twitch red types of muscle and 14% in white muscle. Thus, despite an increase in mitochondrial SOD, the ratio of SOD to mitochondrial citrate cycle and respiratory chain enzymes was decreased. It seems unlikely that increased capacity for enzymatic scavenging of superoxide radical is a major protective adaptation against free radical damage in exercise-trained muscle.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
