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. 2012 Oct 16;61(11):2669–2678. doi: 10.2337/db12-0558

FIG. 4.

FIG. 4.

Both Pi → ATP flux, assessed by 31P-ST MRS, and TCA cycle flux, measured using 13C-MRS to monitor the metabolism of infused [2-13C]acetate, were reduced by ∼40% in the muscle of healthy elderly subjects. Data adapted from Petersen et al. (18), reproduced courtesy of Science.