Scientists investigated the effect of regular exercise on skeletal muscle fibres in mice. Thescientists compared the muscle fibres of mice after six weeks of regular exercise (trained mice)with those of mice that had not exercised (control mice). The scientists stained the muscle fibresfrom both sets of mice to show succinic acid dehydrogenase activity. The darker the stain thegreater the succinic acid dehydrogenase activity.The diagram below shows a typical set of results they obtained.Succinic acid dehydrogenase is an enzyme used in the Krebs cycle.Suggest one reason for the difference in the staining between the muscle fibres of thecontrol mice and the trained mice.

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