Article Title



Davis, Cassandra, Hill, Aimee, Knabe, Chelsey, and advisor Dr. Steve Burns; University of Central Missouri, Warrensburg, Missouri

Different intensities of exercise such as aerobic and anaerobic activities may have different effects on the heart. The aim of this research was to explore the differences of aerobic, anaerobic, and sedentary lifestyles on left ventricular hypertrophy (LVH) and QRS axis. PURPOSE: The purpose of this study was to discover if aerobic athletes, anaerobic athletes or sedentary individuals have different Electrocardiograms. METHODS: Ten sedentary males ages 18-25 volunteered for this study and underwent a resting 12-lead EKG assessment. EKGs previously conducted in 2011 from football (anaerobic n=12) and cross country (aerobic n=10) males were used to determine heart axis and left ventricular hypertrophy (LVH) of the heart. LVH was determined by a subject meeting the criteria for one of the three formulas. Formulas were: sum of the depth of S wave in V1 + height of R wave in V5 or V6 > 35mm, R wave in lead aVL > 11-13mm, and increased QRS voltage measured as the R wave in the lead I + S wave in lead III ≥ 25mm. The QRS axis was determined by using the Hexaxial Diagram. Normal QRS axis ranges from -30°-(+100°). RESULTS: Left ventricular hypertrophy was observed in 30% of anaerobic athletes (3/10), 25% of the aerobic athletes (3/12), and 20% of the sedentary group (2/10). The mean QRS axis was 82.5 for anaerobic and aerobic athletes and 70.2 for the sedentary group. CONCLUSION: The anaerobic group had a higher percentage of subjects that were positive for LVH. There seems to be more cases of LVH in anaerobic than aerobic to be LVH positive. The QRS was in the normal range for all three groups.

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