Abstract:
:Breathing frequency increases at the onset of movement in a wide rage of mammals including adult humans. Moreover, the magnitude of increase in the rate of breathing appears related to the rate of the rhythmic movement. We determined whether human infants show the same type of response when supported to step on a treadmill. Twenty infants (ages 9.7 +/- 1.2 mo) participated in trials consisting of sitting, stepping on the treadmill, followed by sitting again. Breathing frequency was recorded with a thermocouple, positioned under one naris and taped to a soother that the infant held in his/her mouth. A video camera, electrogoniometers, and force platforms under the treadmill belts recorded stepping movements. We found that the rate of breathing changed at the beginning of stepping. Most surprisingly, we found that when infants stepped at a frequency slower than their breathing frequency in sitting, the breathing frequency decreased. Average breathing frequency during stepping was positively correlated with stepping frequency. There was no evidence of entrainment between stepping and breathing. In conclusion, the rapid change in breathing frequency at the beginning of movement is functional in infants. The direction and magnitude of change in breathing is associated with the leg movements.
journal_name
J Neurophysioljournal_title
Journal of neurophysiologyauthors
Noah JA,Boliek C,Lam T,Yang JFdoi
10.1152/jn.00868.2007subject
Has Abstractpub_date
2008-03-01 00:00:00pages
1224-34issue
3eissn
0022-3077issn
1522-1598pii
00868.2007journal_volume
99pub_type
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journal_title:Journal of neurophysiology
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