417901.fig.003
Figure 3: Representative cross section of a biopsy sample (MHCfast immunohistochemistry) (a) and the corresponding 31P-MRS spectrum (c) of a subject predominant for type-II-fibres and the biopsy sample (b) and spectrum (d) of a subject predominant for type-I-fibres. The spectrum of the subject predominant for the fast-twitch fibres (c) shows a higher concentration of PCr and a lower concentration of compared to the spectrum of the subject predominant for slow-twitch fibres (d) assuming a constant ATP concentration of 8.2 mM [11, 22, 33, 34] as indicated by the black horizontal line. (Both datasets are scaled the same), a.u.: arbitrary units.