Table 1.

Cellular high-energy phosphates and O2 carriers in the FDI and TA muscles of the two age groups

CompoundFDITA
AdultElderlyAdultElderly
[PCr]28.0 ± 1.024.5 ± 1.3*28.6 ± 1.125.5 ± 1.8*
[ATP]6.3 ± 0.44.5 ± 0.2*7.0 ± 0.25.6 ± 0.2*
[ATP]/[PCr]0.22 ± 0.010.18 ± 0.01*0.24 ± 0.010.22 ± 0.01
[ADP]0.027 ± 0.0020.032 ± 0.0040.025 ± 0.0020.029 ± 0.004
[Pi ]3.4 ± 0.42.4 ± 0.23.1 ± 0.22.9 ± 0.2
[Mb]0.27 ± 0.010.24 ± 0.01*0.44 ± 0.020.36 ± 0.05*
[Mb]/[PCr]0.0096 ± 0.00030.0103 ± 0.00080.016 ± 0.0010.013 ± 0.001
[Hb]0.02 ± 0.010.03 ± 0.010.09 ± 0.020.17 ± 0.06*
  • Values are shown as the means ± SEM of millimolar concentrations.

  • *, Significant difference between adult and elderly groups.