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. Author manuscript; available in PMC: 2017 Mar 1.
Published in final edited form as: Exp Physiol. 2016 Mar;101(3):421–431. doi: 10.1113/EP085425

Fig. 1.

Fig. 1

Typical time series of 31P NMR spectra acquired from the medial head of the quadriceps muscle of the right leg of a study participant performing incremental exercise to exhaustion. Each spectrum corresponds to three summed free induction decays collected during the final 36 s of each 1 minute workload. A 10 Hz line broadening filter was applied prior to Fourier transformation. Pi = inorganic phosphate; PCr = phosphocreatine; ATP = adenosine triphosphate.