Fuchs F
Biochim Biophys Acta. 1979 Jul 4;585(3):477-9. doi: 10.1016/0304-4165(79)90092-8.
Variation of pH over the range 6.2--7.4 had no effect on the Ca2+ titration curve of glycerinated rabbit psoas muscle fibers. Thus the effect of H+ on muscle contraction is not due to a simple H+-Ca2+ competition for binding sites.