This study investigates biochemical changes in dystrophic muscle, focusing on mitochondrial succinate-tetrazolium reductase and adenosine triphosphatase (ATPase) activities. The research was conducted on mice with a hereditary muscular dystrophy, which is inherited through an autosomal recessive gene. The study aimed to understand the biochemical basis of muscle dystrophy, as morphological changes in dystrophic muscle are not fully understood. The study measured the activity of two mitochondrial enzymes: succinate dehydrogenase (assessed by the reduction of a tetrazolium salt) and ATPase. These measurements were taken in dystrophic and normal mouse muscle. The results showed that the ATPase activity in dystrophic muscle was approximately 15% higher than in normal muscle, when expressed on a per mitochondrial nitrogen basis. However, there was no significant difference in the response to dinitrophenol, a known stimulant of ATPase activity, between dystrophic and normal muscle. The study also found that the succinate-tetrazolium reductase activity was normal in dystrophic muscle, suggesting that the mitochondrial structure and function were not significantly impaired. The results indicate that while there are biochemical differences in dystrophic muscle, the overall mitochondrial function remains largely intact. The study highlights the importance of understanding the biochemical mechanisms underlying muscle dystrophy, as this knowledge can contribute to the development of therapeutic strategies for these conditions. The findings also suggest that the differences in ATPase activity observed in dystrophic muscle may be related to the overall metabolic state of the muscle rather than a direct effect of the dystrophy itself.This study investigates biochemical changes in dystrophic muscle, focusing on mitochondrial succinate-tetrazolium reductase and adenosine triphosphatase (ATPase) activities. The research was conducted on mice with a hereditary muscular dystrophy, which is inherited through an autosomal recessive gene. The study aimed to understand the biochemical basis of muscle dystrophy, as morphological changes in dystrophic muscle are not fully understood. The study measured the activity of two mitochondrial enzymes: succinate dehydrogenase (assessed by the reduction of a tetrazolium salt) and ATPase. These measurements were taken in dystrophic and normal mouse muscle. The results showed that the ATPase activity in dystrophic muscle was approximately 15% higher than in normal muscle, when expressed on a per mitochondrial nitrogen basis. However, there was no significant difference in the response to dinitrophenol, a known stimulant of ATPase activity, between dystrophic and normal muscle. The study also found that the succinate-tetrazolium reductase activity was normal in dystrophic muscle, suggesting that the mitochondrial structure and function were not significantly impaired. The results indicate that while there are biochemical differences in dystrophic muscle, the overall mitochondrial function remains largely intact. The study highlights the importance of understanding the biochemical mechanisms underlying muscle dystrophy, as this knowledge can contribute to the development of therapeutic strategies for these conditions. The findings also suggest that the differences in ATPase activity observed in dystrophic muscle may be related to the overall metabolic state of the muscle rather than a direct effect of the dystrophy itself.