The present study was undertaken to determine if leads CM₅, CC₅, and V₅ are equally sensitive in detecting ST segment depression with exercise or hyperventilation in apparently normal males. Seven physically active men (29.4 + 2.9 yrs, 180.9 + 2.5 cm, 77.9 + 3.4 kg, x±SEM), free of risk factors for heart disease, were initially found to have J point (J₀) depression with mild exercise in lead V₅. Simultaneous ECG recordings from CM₅, CC₅ and V₅ during seated rest (REST), immediately post-moderate exercise (IPE), and after 30 s of hyperventilation (HVT). ECG signals were manually evaluated for ST segment depression at the J point and 60 ms and 80 ms past the J point (J₆₀, J₈₀). None of the three leads differed in their ability to detect ST segment changes. With exercise, J₀ was significantly (P<.05) reduced compared to REST; neither J₆₀ nor J₈₀ differed from REST. HVT reduced J₀ significantly but not J₆₀ or J₈₀ Exercise provoked greater reductions than HVT. These data suggest that, in apparently healthy adult males, these three ECG leads are equally able to detect J point changes with exercise and hyperventilation, but exercise results in a relatively greater downward ST segment shift than does hyperventilation. / Master of Science
| Identifer | oai:union.ndltd.org:VTETD/oai:vtechworks.lib.vt.edu:10919/42220 |
| Date | 25 April 2009 |
| Creators | Gallagher, Libby A. |
| Contributors | Education, Herbert, William G., Sebolt, Don R., Humphrey, Reed H. |
| Publisher | Virginia Tech |
| Source Sets | Virginia Tech Theses and Dissertation |
| Language | English |
| Detected Language | English |
| Type | Thesis, Text |
| Format | iv, 71 leaves, BTD, application/pdf, application/pdf |
| Rights | In Copyright, http://rightsstatements.org/vocab/InC/1.0/ |
| Relation | OCLC# 34271689, LD5655.V855_1995.G355.pdf |
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