... contractile performance and metabolic capacity in a high-frequency muscle. Physiol Biochem Zool 2006, 79:20-30.13. Matsubara K, Tarui H, Toriba M, Yamada K, Nishida-Umehara C, Agata K, Matsuda Y: Evidence ... mechanisms that underlie regu-lation of organ performance and regeneration. ese animals are also readily obtained from commercial breeders, non-aggressive, and easier and cheaper to care for ... physiological changes, including: a 44-fold increase in metabolic rate (the highest among tetrapods); 35 to 100% increases in the mass of the heart, liver, pancreas, small intestine, and...