Gastric Myoelectrical Activity Increases after Moderate-Intensity Exercise with no Meals under Suppressed Vagal Nerve Activity

Kato, Masataka; Sakai, Toshiro; Yabe, Kyonosuke; Miyamura, Miharu; Soya, Hideaki

doi:10.2170/jjphysiol.54.221

Cited by 18 publications

(13 citation statements)

References 19 publications

(24 reference statements)

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“…Mechanisms proposed which could contribute to exerciseinduced alterations in GE include changes in contraction frequencies, antral area [84] and gastric myoelectrical activity [85,86]; hormonal [45,47,61] and neural factors (mainly vagal in origin) [29]; alterations in gut blood flow [43]; and the mechanical effects of 'bouncing of the gut' [43,45,47,87] during exercise. Splanchnic blood flow is decreased by up to 80 % at an exercise intensity of 70 % of _ VO 2 max [88].…”

Section: Mechanismsmentioning

confidence: 99%

Acute Exercise and Gastric Emptying: A Meta-Analysis and Implications for Appetite Control

et al. 2014

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These results suggest that exercise intensity, mode, duration and the nature of meal/fluid ingested all influence GE during and after acute exercise. The relationship of GE parameters with appetite regulation after exercise remains largely unexplored. Further integrative studies combining GE and alterations in gut hormones, as well as in populations such as overweight and obese individuals are needed.

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Section: Mechanismsmentioning

confidence: 99%

Acute Exercise and Gastric Emptying: A Meta-Analysis and Implications for Appetite Control

et al. 2014

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“…In contrast, it has also been well demonstrated that vagotomy can delay gastric emptying (Antia et al 1951;Shibata et al 1995). Gastric motility is known to be regulated by gastric myoelectrical activity; recently, enhancement of postprandial gastric myoelectrical activity after moderate intensity exercise was reported (Lu et al 2000;Kato et al 2004). Whether those enhancements were mediated via the vagal pathway remains unclear; therefore, evaluating the effect of mild to moderate exercise on gastric motility under vagotomized conditions would be useful.…”

mentioning

confidence: 99%

Vagal Nerve Regulation Is Essential for the Increase in Gastric Motility in Response to Mild Exercise

Wang

Kondo

Suzukamo

et al. 2010

Tohoku J. Exp. Med.

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It has been shown that mild to moderate exercise can accelerate gastric emptying in humans. However, understanding of the underlying mechanism is hampered by the lack of appropriate animal models. To investigate the effects of mild exercise on gastric motility, we developed an animal model, in which strain gauge transducers were surgically planted on the antral surfaces of female Sprague-Dawley rats. We continuously recorded the contractions of gastric circular muscle in unrestrained conscious rats, divided into four groups: sham-operated exercise, sham-operated sedentary, vagotomized exercise, and vagotomized sedentary. The rats were trained for 3 weeks, and gastric motility was monitored before and after exercise. Although exercise accelerates gastric antral contraction in sham-operated rats, this effect was absent in the vagotomized exercise group, indicating the involvement of the vagal nerve in the exercise-mediated increase in gastric motility. Among the four groups, daily food intake was highest in the sham-operated exercise group. In contrast, the vagotomized exercise group exhibited the smallest body weight gain. Severe gastric retention was observed in vagotomized rats, suggesting a role of the vagal nerve in facilitating food movement and digestion in the stomach. Moreover, at the end of the 3-week exercise, there were no differences in plasma levels of growth hormone, peptid YY, and ghrelin among the four groups. These results indicate that in response to a mild physical exercise challenge, the vagal nerve stimulates gastric motility and enhances the ability of the stomach to process food. Our findings highlight the significance of neuronal control of stomach function.

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“…They also found that the percentage of normal gastric slow waves increased after exercise. Kato et al observed that exercise alone led to a greater increment in DP than a meal alone and that DF decreased under fasting conditions after exercise [23]. These discrepancies may be the result of different protocols used in the three studies.…”

Section: Discussionmentioning

confidence: 95%

“…Although HRV is an established method to assess autonomic innervation of the heart, the effects of exercise on HRV vary widely. Moderate exercise was reported to cause a reduction in the high-frequency component (HF) [23], in both the HF and lowfrequency component (LF) [25], in HRV as a whole [26], or no significant change in HF [2]. Whereas exercise training lasting for weeks or months was shown to have no impact on HRV [27], cause an increase in HRV [26,28], or lead to decreased LF and increased HF [29].…”

Section: Discussionmentioning

confidence: 99%

Noninvasive measurements to evaluate the effects of military training on the human autonomic nervous system

et al. 2014

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Background: Chinese university freshmen receive 4-weeks military training that involved moderate to intense physical exercise. Studies have demonstrated heterogeneous effects of exercise on the autonomic nervous system. Objective: To evaluate the effects of training on the autonomic nervous system noninvasively using electrogastrograms, heart rate variability (HRV), pulse rate, and the sympathetic skin response (SSR). Methods: Twenty freshmen received all assessments in the fasting state and after a standard meal: (1) one week before the training, (2) at the end of the second week of the training, and (3) one week after the training. Results: (1) The training had a significant effect on meal-induced gastric pacemaker activity. Before the training, a standard meal did not increase the dominant frequency of gastric slow waves, but the frequency increased during and after the training; (2) The preprandial high frequency (HF), low frequency (LF), and very low frequency (VLF) components of heart rate variability decreased significantly after the training. The ratio of the LF and HF (LF/HF) of the heart rate variability (HRV) did not significantly change after a meal or training condition. The basal pulse rate did not change. The latencies of the sympathetic skin response (SSR), as measured in the arm muscle, increased in response to the training. Conclusion: Military training affects meal-induced changes in gastric pacemaker activity, causes a marked reduction of the vagal tone to the heart with maintenance of the vagal-sympathetic balance, and its effects on SSR may reflect a reduction in sympathetic tone.

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Gastric Myoelectrical Activity Increases after Moderate-Intensity Exercise with no Meals under Suppressed Vagal Nerve Activity

Cited by 18 publications

References 19 publications

Acute Exercise and Gastric Emptying: A Meta-Analysis and Implications for Appetite Control

Acute Exercise and Gastric Emptying: A Meta-Analysis and Implications for Appetite Control

Vagal Nerve Regulation Is Essential for the Increase in Gastric Motility in Response to Mild Exercise

Noninvasive measurements to evaluate the effects of military training on the human autonomic nervous system

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