title: The effect of reduced activity on the enzymatic development of phasic and tonic muscles in the chicken.
abstract: The effects of reduced activity (immobilisation) on the development of the contractile enzyme, Mg2+-activated myofibrillar ATPase was studied in a tonic muscle, the anterior latissimus dorsi and in a phasic muscle, the posterior latissimus dorsi of the chicken. Mg2+-activated myofibrillar ATPase activity showed a decreased and delayed activity peak in both the immobilised muscles. Large differences between the two muscles were observed using this marker enzyme. These data indicate that the activity of Mg2+-activated myofibrillar ATPase and the associated differential gene expression involved in fibre type differentiation are influenced by the early activity pattern of the muscles.
mesh_terms: D000251:Adenosine Triphosphatases / Q000378:metabolism; D000367:Age Factors; D000818:Animals; D001835:Body Weight; D002645:Chickens; D007103:Immobilization; D008297:Male; D024510:Muscle Development; D009132:Muscles / Q000201:enzymology*; D009210:Myofibrils / Q000201:enzymology
chemical_list: D000251:Adenosine Triphosphatases