The distribution of eukaryotic initiation factor 4E after bouts of resistance exercise is altered by shortening of recovery periods.

Junya Takegaki, Riki Ogasawara, Karina Kouzaki, Satoshi Fujita, Koichi Nakazato, Naokata Ishii

The journal of physiological sciences : JPS 2020 Nov 04

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Insufficient duration of recovery between resistance exercise bouts reduces the effects of exercise training, but the influence on muscle anabolic responses is not fully understood. Here, we investigated the changes in the distribution of eukaryotic initiation factor (eIF) 4E, a key regulator of translation initiation, and related factors in mouse skeletal muscle after three successive bouts of resistance exercise with three durations of recovery periods (72 h: conventional, 24 h: shorter, and 8 h: excessively shorter). Bouts of resistance exercise dissociated eIF4E from eIF4E binding protein 1, with the magnitude increasing with shorter recovery. Whereas bouts of resistance exercise with 72 h recovery increased the association of eIF4E and eIF4G, those with shorter recovery did not. Similar results were observed in muscle protein synthesis. These results suggest that insufficient recovery inhibited the association of eIF4E and eIF4G, which might cause attenuation of protein synthesis activation after bouts of resistance exercise.

Citation

Junya Takegaki, Riki Ogasawara, Karina Kouzaki, Satoshi Fujita, Koichi Nakazato, Naokata Ishii. The distribution of eukaryotic initiation factor 4E after bouts of resistance exercise is altered by shortening of recovery periods. The journal of physiological sciences : JPS. 2020 Nov 04;70(1):54