Abstract
This study examined the effect of carbohydrate drink ingestion timing on gastrointestinal tract blood flow and motility after mild cycling exercise. Eight healthy participants were randomly assigned to ingest a liquid solution with 75 g glucose at either 5 min (PE-5) or 30 min (PE-30) after a single bout of leg cycling exercise according to target heart rate (approximately 120 beats/min). As the control trial (Con), participants ingested the same liquid solution without exercise. Celiac artery blood flow (BF), superior mesenteric artery BF, and gastric emptying rate were assessed by ultrasonography before and for 60 min after ingesting the glucose solution. Blood lactate, glucose, and plasma insulin were also measured at baseline and for 60 min after ingesting the glucose solution. Celiac artery BF significantly decreased from resting baseline immediately after exercise in both the PE-5 and PE-30 trials, and then returned to resting baseline just before the ingestion of glucose solution in the PE-30 trial. After ingesting the glucose solution, changes in celiac artery BF, superior mesenteric artery BF, % gastric emptying rate, blood lactate, blood glucose, and plasma insulin were not significantly different among the three trials. The timing of nutrient ingestion after mild exercise does not seem to impact the subsequent gastrointestinal motility, blood flow, and glycemic responses.
Highlights
Endurance athletes often experience gastrointestinal (GI) tract hypoperfusion immediately after strenuous exercise [1,2]
Responses were comparable with those in a non-exercise trial [3]. This result implies that the celiac artery blood flow (BF) response after exercise seems to modulate the subsequent gastric emptying (GE) rate and superior mesenteric
Plasma insulin responses were examined simultaneously to partially determine whether the glycemic response was due to the GE rate or to improved glucose tolerance after exercise. To test this hypothesis with a low-intensity cycling exercise, we investigated the effect of the timing of post-exercise carbohydrate supplementation on GI BF, motility, blood lactate, and glycemic response, the last of which is closely correlated with the GE rate [13]
Summary
Endurance athletes often experience gastrointestinal (GI) tract hypoperfusion immediately after strenuous exercise [1,2]. Evidence suggests that celiac artery blood flow (BF) declines immediately (5 min) post exercise (PE-5), while the GE rate is delayed when compared to those who do not exercise [3]. The superior mesenteric artery BF response was delayed [3]. When the celiac artery BF returned to the resting baseline value 30 min post exercise (PE-30), GE rates and superior mesenteric artery BF responses were comparable with those in a non-exercise trial [3]. This result implies that the celiac artery BF response after exercise seems to modulate the subsequent GE rate and superior mesenteric
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