Fig. 5. Lineweaver–Burk double-reciprocal plots of cardiac myosin adenosine triphosphatase (ATPase) rates as a function of actin concentrations at baseline (  A ), with 1 minimum alveolar concentration (MAC) halothane (  B ), with 2 MAC halothane (  C ), with 1 MAC isoflurane (  D ), with 2 MAC isoflurane (  E ), and with 2,3-butanedione 2-monoxime (BDM, 2 mm) (  F ). Values are presented as mean ± SD of five individual measurements.