Food Intake Increases Resting Muscle Oxygen Consumption As Measured By Near‐infrared Spectroscopy

Abstract

The purpose of this study was to quantitatively examine the changes in muscle oxygen consumption (VO 2mus ) after food intake as measured by near-infrared continuous wave spectroscopy (NIRcws). Six healthy male subjects were given a meal with a calculated total energy content of 10 kcal/kg body. VO 2mus was measured from 15 min to 150 min after they finished eating. VO 2mus in the finger flexor muscles was estimated by the rate of deoxygenation during arterial occlusion using NIRcws. The absolute value of VO 2mus was calculated using each subject's resting metabolic rate measured by 31 Phosphorus-magnetic resonance spectroscopy ( 31 P-MRS). Deep tissue temperature (T D ) was also monitored in the forearm same area. The control experiment followed the same protocol but without meal. There was a significant increase in VO 2mus : pre-meal value was 1.47 ± 0.17 M O 2 /s, post-meal peak value (post 120 min) was 2.31 ± 0.38 M O 2 /s (p < .05 vs. pre). In contrast, the control experiment did not show any increase. There was no significant difference in T D between the two experiments. The results indicate that food intake induced a significant increase in VO 2mus . NIRcws can be used to provide specific information about changes in localized muscle metabolism elicited by food intake.

Eating and drinking experience in patients with idiopathic pulmonary fibrosis: a qualitative study

“…This could be attributed to the expansion of the stomach during digestion, which can push against the diaphragm and lungs, making it harder to breathe 34. Additionally, eating can also increase the demand for oxygen in the body, further exacerbating breathlessness in those patients with already compromised lung function 35. The patients shared some techniques they applied in order to alleviate breathing discomfort, including being slower, eating smaller meals and eating more frequent meals throughout the day rather than large, heavy meals.…”

“… 34 Additionally, eating can also increase the demand for oxygen in the body, further exacerbating breathlessness in those patients with already compromised lung function. 35 The patients shared some techniques they applied in order to alleviate breathing discomfort, including being slower, eating smaller meals and eating more frequent meals throughout the day rather than large, heavy meals. These findings are in line with previous qualitative literature in patients with COPD.…”

The challenges of measuring physical activity and sedentary behaviour in people with rheumatoid arthritis

“…However, it must be noted that these are not necessarily exact equivalents of each other, although they are used interchangeably in definitions of MET and energy expenditure. Food intake [ 19 , 20 ] and body composition [ 21 ] can affect the relationships between the intensity of an activity and the measured oxygen consumption. Also, at high intensities the energy expenditure will be, in part, through anaerobic metabolism, which will affect the validity of oxygen uptake as a measure of exertion.…”