Diurnal Variations in Muscle and Liver Glycogen Differ Depending on the Timing of Exercise

Overview

Journal J Physiol Sci

Specialty Physiology

Date 2021 Nov 22

PMID 34802419

Citations 6

Authors

Kaito Iwayama

Yoko Tanabe

Fumiya Tanji

Takahiro Ohnishi

Hideyuki Takahashi

Affiliations

Soon will be listed here.

Abstract

It has been suggested that glycogen functions not only in carbohydrate energy storage, but also as molecular sensors capable of activating lipolysis. This study aimed to compare the variation in liver and muscle glycogen during the day due to different timing of exercise. Nine healthy young men participated in two trials in which they performed a single bout of exercise at 70% of their individual maximal oxygen uptake for 60 min in the post-absorptive (morning) or post-prandial (afternoon) state. Liver and muscles glycogen levels were measured using carbon magnetic resonance spectroscopy (C MRS). Diurnal variations in liver and muscle glycogen compared to baseline levels were significantly different depending on the timing of exercise. The effect of the timing of exercise on glycogen fluctuation is known to be related to a variety of metabolic signals, and the results of this study will be useful for future research on energy metabolism.

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