Behavior Modification

 

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Behavior Modification, Vol. 27, No. 5, 671-691 (2003)
DOI: 10.1177/0145445503256321
© 2003 SAGE Publications

The LifeShirt

An Advanced System for Ambulatory Measurement of Respiratory and Cardiac Function

Frank H. Wilhelm

Stanford University and Department of Veterans Affairs Health Care System, fwilhelm{at}stanford.edu

Walton T. Roth

Stanford University and Department of Veterans Affairs Health Care System

Marvin A. Sackner

University of Miami at Mt. Sinai Medical Center

An accurate ambulatory breathing monitor is needed to observe acute respiratory changes in patients with medical or psychological disorders outside the clinic (e.g., hyperventilation during panic or apneas during sleep). Significant limitations of existing monitors are size, troublesome operation, and difficulty holding chest and abdomen bands in place during 24-hour recordings. Recently, a garment has been developed with embedded inductive plethysmography sensors for continuous ambulatory monitoring of respiration, heart activity, inductive cardiography, motility, postural changes, and other functions. The signals are displayed and stored on a handheld computer (Visor), and then analyzed offline, extracting more than 40 clinical parameters relating to cardiorespiratory function (e.g., heart rate, respiratory sinus arrhythmia, tidal volume, stroke volume, pre-ejection period, apnea-hypopnea index, thoraco-abdominal coordination, sighing). The device also serves as an electronic diary of symptoms, moods, and activities. This advanced system may open a new era in ambulatory monitoring for clinical practice and scientific research.

Key Words: respiration • tidal volume • respiratory sinus arrhythmia • sleep apnea • anxiety disorders • ambulatory monitoring • review


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