Correlates of exercise hyperemia and muscle energetics in the human upper arm.

ABSTRACT: We employed interleaved dynamic 1H magnetic resonance imaging (MRI) and 31P MR spectroscopy in combination with arm-cycling to investigate correlations of exercise hyperemia and muscle energetics in the triceps brachii (TB) muscle of the upper arm of healthy individuals. The parameter hyperemic slope (HS) determined from MRI acquisitions immediately after exercise was used as primary index of maximal TB oxygenation level in response to exercise. We found that HS tended to be inversely correlated with TB acidification during exercise (P =0.06) as opposed to findings in leg muscle. The absolute increase in cardiac-output during exercise was found to be uncorrelated with HS (P =0.19) suggesting that the magnitude of the hyperemic response to exercise involving a minor muscle mas

SUBMITTER: Jeneson JAL 

PROVIDER: S-EPMC12633028 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature