Biology ETDs

Publication Date

11-8-1972

Abstract

Ten men worked on a bicycle ergometer at increasing work loads to exhaustion in 15 min. Each performed one test breathing air and another with added CO2 (Pico2=15 mmHg) in random sequence. The electrocardiogram was recorded at rest, during exercise and at regular intervals for 30 min of recovery. Arterial samples for blood gases, pH, electrolytes, total protein and hemoglobin were drawn at rest, in the last minute of exercise and at 1, 4, 10, 20 and 30 min thereafter. A striking increase in the amplitude of T-and P-waves was observed in the first two minutes after exercise. All electrolyte concentrations were increased at the end of exercise, most markedly potassium (60%) and phosphorus (53%). Potassium dropped faster than all others to below resting values in 4 min coinciding with the lost levels in plasma bicarbonate. ECG alterations were not closely related in time with any single factor such as potassium, but appeared to reflect an interaction of the transient mineral and acid-base imbalance during and immediately following exhaustive exercise. The ECG alterations may also have been in part related to changes in autonomic drive occurring as exercise was terminated.

Language

English

Document Type

Dissertation

Degree Name

Biology

Level of Degree

Doctoral

Department Name

UNM Biology Department

First Committee Member (Chair)

U. C. Luft

Second Committee Member

Marvin LeRoy Riedesel

Third Committee Member

Francis Newton Lebaron

Fourth Committee Member

J. David Ligon

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