Table 1.

Mean CVs as a Result of the Reproducibility Measurements

	[γ‐ATP]	[α‐ATP]	[GPC]	[GPE]	[Pi]	[PC]	[PE]	[UDPG]	[NADH]	[PtdC]
Test‐retest mean CV (n =  7)	5.6%	10.5%	8.7%	10.1%	11.8%	12.9%	11.6%	19.9%	19.0%	42.2%
Day‐to‐day mean CV (n =  4)	4.5%	6.4%	10.3%	8.6%	9.5%	12.7%	16.1%	16.3%	10.3%	34.3%

Test‐retest CVs state the variability of the metabolite concentrations of two successive measurements of a volunteer in one session, while day‐to‐day CVs represent the variation of metabolite concentrations of two single measurements on different days of a volunteer. Mean values of CV were calculated as arithmetical average over the measurement sessions and volunteers for test‐retest and day‐to‐day comparison, respectively.