Sucrose ingestion after exhaustive exercise accelerates liver, but not muscle glycogen repletion compared with glucose ingestion in trained athletes

Mar 26, 2016Journal of applied physiology (Bethesda, Md. : 1985)

Sugary drink after intense exercise speeds up liver, but not muscle, energy storage compared to glucose in trained athletes

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Abstract

Sucrose ingestion resulted in a 3.4 g/h greater liver glycogen repletion rate compared to glucose following exercise.

Postexercise muscle glycogen concentrations increased similarly after ingestion of sucrose and glucose, with no significant differences between treatments.
Liver glycogen concentrations showed a trend towards greater increases following sucrose ingestion compared to glucose, with a time × treatment interaction approaching significance.
Liver volume significantly increased only after sucrose ingestion during the 300-minute recovery period.
Total liver glycogen content rose more substantially with sucrose, increasing from 53.6 ± 16.2 g to 86.8 ± 29.0 g, compared to glucose's increase from 49.3 ± 25.5 g to 65.7 ± 27.1 g.
The findings suggest that sucrose could be more effective than glucose for liver glycogen replenishment in trained athletes postexercise.

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The purpose of this study was to assess the effects of sucrose vs. glucose ingestion on postexercise liver and muscle glycogen repletion. Fifteen well-trained male cyclists completed two test days. Each test day started with glycogen-depleting exercise, followed by 5 h of recovery, during which subjects ingested 1.5 g·kg(-1)·h(-1) sucrose or glucose. Blood was sampled frequently and (13)C magnetic resonance spectroscopy and imaging were employed 0, 120, and 300 min postexercise to determine liver and muscle glycogen concentrations and liver volume. Results were as follows: Postexercise muscle glycogen concentrations increased significantly from 85 ± 27 (SD) vs. 86 ± 35 mmol/l to 140 ± 23 vs. 136 ± 26 mmol/l following sucrose and glucose ingestion, respectively (no differences between treatments: P = 0.673). Postexercise liver glycogen concentrations increased significantly from 183 ± 47 vs. 167 ± 65 mmol/l to 280 ± 72 vs. 234 ± 81 mmol/l following sucrose and glucose ingestion, respectively (time × treatment, P = 0.051). Liver volume increased significantly over the 300-min period after sucrose ingestion only (time × treatment, P = 0.001). As a result, total liver glycogen content increased during postexercise recovery to a greater extent in the sucrose treatment (from 53.6 ± 16.2 to 86.8 ± 29.0 g) compared with the glucose treatment (49.3 ± 25.5 to 65.7 ± 27.1 g; time × treatment, P < 0.001), equating to a 3.4 g/h (95% confidence interval: 1.6-5.1 g/h) greater repletion rate with sucrose vs. glucose ingestion. In conclusion, sucrose ingestion (1.5 g·kg(-1)·h(-1)) further accelerates postexercise liver, but not muscle glycogen repletion compared with glucose ingestion in trained athletes.

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Sucrose ingestion after exhaustive exercise accelerates liver, but not muscle glycogen repletion compared with glucose ingestion in trained athletes

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