Gastric emptying during walking and running: effects of varied exercise intensity

  • P. D. Neufer
  • A. J. Young
  • M. N. Sawka
Article

Summary

Gastric emptying is increased during running (50%–70% maximal aerobic uptake,\(\dot V_{{\text{O}}_{{\text{2max}}} } \) as compared to rest. Whether this increase varies as a function of mode (i. e. walking vs running) and intensity of treadmill exercise is unknown. To examine the gastric emptying characteristics of water during treadmill exercise performed over a wide range of intensities relative to resting conditions, 10 men ingested 400 ml of water prior to each of six 15 min exercise bouts or 15 min of seated rest. Three bouts of walking exercise (1.57 m · s−1) were performed at increasing grades eliciting ∼28%, 41% or 56% of\(\dot V_{{\text{O}}_{{\text{2max}}} } \). On a seperate day, three bouts of running (2.68 ms−1) exercise were performed at grades eliciting ∼57%, 65% or 75% of\(\dot V_{{\text{O}}_{{\text{2max}}} } \). Gastric emptying was increased during treadmill exercise at all intensities excluding 75%\(\dot V_{{\text{O}}_{{\text{2max}}} } \) as compared to rest. Gastric emptying was similar for all intensities during walking and at 57% and 65%\(\dot V_{{\text{O}}_{{\text{2max}}} } \) during running. However, running at 74%\(\dot V_{{\text{O}}_{{\text{2max}}} } \) decreased the volume of original drink emptied as compared to all lower exercise intensities. Stomach secretions were markedly less during running as compared to walking and rest. These data demonstrate that gastric emptying is similarly increased during both moderate intensity (∼8%–65%\(\dot V_{{\text{O}}_{{\text{2max}}} } \)) walking or running exercise as compared to resting conditions. However, gastric emptying decreases during high intensity exercise. Increases in gastric emptying during moderate intensity treadmill exercise may be related to increases in intragastric pressure brought about by contractile activity of the abdominal muscles.

Key words

Gartric emptying Exercise intensity Stomach secretions 

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Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • P. D. Neufer
    • 1
  • A. J. Young
    • 1
  • M. N. Sawka
    • 1
  1. 1.US Army Research Institute of Environmental MedicineNatickUSA

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