NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
A new technique for simultaneous monitoring of electrocardiogram and walking cadenceA new technique for simultaneously recording continuous electrocardiographic (ECG) data and walking step rate (cadence) is described. The ECG and gait signals are recorded on 2 channels of an ambulatory Holter monitor. Footfall is detected using ultrathin, force-sensitive foot switches and is frequency modulated. The footfall signal provides an indication of the subject's activity (walking or standing), as well as the instantaneous walking rate. Twenty-three young and elderly subjects were studied to demonstrate the use of this ECG and gait recorder. High-quality gait signals were obtained in all subjects, and the effects of walking on the electrocardiogram were assessed. Initial investigation revealed the following findings: (1) Although walking rates were similar in young and elderly subjects, the elderly had both decreased heart rate (HR) variability (p < 0.005) and increased cadence variability (p < 0.0001). (2) Overall, there was an inverse relation between HR and cadence variability (r = -0.73). Three elderly subjects with no known cardiac disease had HR and cadence variability similar to those of the young, whereas elderly subjects with history of congestive heart failure were among those with the lowest HR variability and the highest cadence variability. (3) Low-frequency (approximately equal to 0.1 Hz) HR oscillations (frequently observed during standing) persisted during walking in all young subjects. (4) In some subjects, both step rate and HR oscillated at the same low frequency (approximately equal to 0.1 Hz) previously identified with autonomic control of the baroreflex.(ABSTRACT TRUNCATED AT 250 WORDS).
Document ID
20050000588
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hausdorff, J. M.
(Charles A. Dana Research Institute Boston, Massachusetts)
Forman, D. E.
Pilgrim, D. M.
Rigney, D. R.
Wei, J. Y.
Goldberger, A. L.
Date Acquired
August 22, 2013
Publication Date
October 15, 1992
Publication Information
Publication: The American journal of cardiology
Volume: 70
Issue: 11
ISSN: 0002-9149
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: 1-R01-HL42172
CONTRACT_GRANT: 1-P30-AG-08812-01
CONTRACT_GRANT: DA06306
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Cardiopulmonary
Non-NASA Center

Available Downloads

There are no available downloads for this record.
No Preview Available