Table 2.

Metabolite levels determined by MR at rest and at the end of stimulation

Quantity	Group	Rest	Stimulation end	Stimulation–Rest
[PCr] (mM)	Adult	29.24 ± 1.60	20.44 ± 1.32	−8.80 ± 1.37*
	Elderly	27.11 ± 0.88	18.24 ± 0.79	−8.87 ± 0.38*
[P1] (mM)	Adult	4.32 ± 0.69	11.62 ± 1.78	7.30 ± 1.32*
	Elderly	3.87 ± 0.22	11.12 ± 0.74	7.24 ± 0.56*
pH	Adult	7.063 ± 0.011	7.040 ± 0.016	−0.022 ± 0.022
	Elderly	7.058 ± 0.006	7.020 ± 0.009	−0.036 ± 0.011*
[ADP] (mM)	Adult	0.030 ± 0.004	0.062 ± 0.007	0.032 ± 0.005*
	Elderly	0.031 ± 0.0015	0.065 ± 0.002	0.033 ± 0.002*

Values are means ± S.E.M. The sample size was 9 for the adult group and 40 for the elderly group.

^*Significant difference between conditions.