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. 2010 Sep 16;109(6):1769–1778. doi: 10.1152/japplphysiol.01423.2009

Table 2.

Resting metabolic variables

Children Adults P
pHi 7.05 ± 0.05 7.05 ± 0.04 NS
[PCr], mM 29.7 ± 1.9 32.5 ± 4.5 NS
[Pi], mM 4.9 ± 1.0 4.0 ± 1.2 NS
[PCr]/[Pi] 6.6 ± 1.4 8.8 ± 1.8 <0.05
[ADP], μM 9.1 ± 3.3 9.2 ± 1.7 NS

Values are means ± SD. pHi, intracellular pH; [PCr], phosphocreatine concentration; [Pi], inorganic phosphate concentration; [PCr]/[Pi], PCr-to-Pi concentration ratio; [ADP], adenosine diphosphate concentration.