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. Author manuscript; available in PMC: 2023 Jul 1.
Published in final edited form as: J Physiol. 2022 Jun 2;600(13):3069–3081. doi: 10.1113/JP283036

Figure 6. Relationship between maximal voluntary quadriceps force (MVC) intramuscular [H+] and [Pi] during exercise.

Figure 6.

H+ and Pi were measured using phosphorus magnetic resonance spectroscopy (31P-MRS) during 60 knee-extensor MVCs. Trial 1 and 2 were separated by 5 min of rest. Individual participant data are presented in panels A & C (these data are fit with linear regressions only to illustrate trends). The linear mixed effects model results on the standardized (Z-score) MVC, H+, and Pi are presented in panels B & D. N = 10.