Neufer P D, Young A J, Sawka M N
US Army Research Institute of Environmental Medicine, Natick, MA 01760-5007.
Eur J Appl Physiol Occup Physiol. 1989;58(4):440-5. doi: 10.1007/BF00643522.
Gastric emptying is increased during running (50%-70% maximal aerobic uptake, VO2max) 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 approximately 28%, 41% or 56% of VO2max. On a separate day, three bouts of running (2.68 ms-1) exercise were performed at grades eliciting approximately 57%, 65% or 75% of VO2max. Gastric emptying was increased during treadmill exercise at all intensities excluding 75% VO2max as compared to rest. Gastric emptying was similar for all intensities during walking and at 57% and 65% VO2max during running. However, running at 74% VO2max 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 (approximately 28%-65% VO2max) 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.
与休息时相比，跑步（最大摄氧量的50%-70%，VO2max）时胃排空加快。这种增加是否会因运动方式（即步行与跑步）和跑步机运动强度的不同而有所变化尚不清楚。为了研究在相对于静息状态的广泛强度下进行跑步机运动时水的胃排空特征，10名男性在六次15分钟的运动时段或15分钟的坐姿休息前分别摄入400毫升水。进行了三轮步行运动（1.57米/秒），坡度逐渐增加，分别达到约28%、41%或56%的VO2max。在另一天，进行了三轮跑步（2.68米/秒）运动，坡度分别达到约57%、65%或75%的VO2max。与休息时相比，除了75%VO2max强度外，跑步机运动各强度下胃排空均加快。步行时所有强度以及跑步时57%和65%VO2max强度下的胃排空相似。然而，与所有较低运动强度相比，以74%VOmax强度跑步时，原饮料排空量减少。与步行和休息相比，跑步时胃分泌明显减少。这些数据表明，与静息状态相比，中等强度（约28%-65%VO2max）的步行或跑步运动期间胃排空同样加快。然而，高强度运动时胃排空会减慢。中等强度跑步机运动期间胃排空的增加可能与腹肌收缩活动引起的胃内压升高有关。
