The purpose of this study was to compare the ventilatory breakpoints during exercise between young boys and adult men. Twenty-four active volunteers, 12 boys (10.8 ± 0.3 years of age) and 12 men (24.6 ± 1.1 years of age) with similar aerobic power (53.6 ± 4.2 to 55.7 ± 3.5 mlkg−1min−1), participated in the study. Each participant completed a standardized Physical Activity Questionnaire and anthropometric variables were measured. The exercise testing consisted of two graded tests to exhaustion on a treadmill. Heart rates were recorded every minute and gas exchange parameters were obtained every 30 s throughout the tests. Each ventilatory breakpoint was determined using a three-part model. Although the relative VO2peak values were not significantly different between the boys and the young adults, the boys reported significantly (p < .05) higher total activity than the adults. The boys had a significantly higher (p > .05) first ventilatory breakpoint expressed as a percentage of VO2peak than the adults (64.9% vs. 57.7%). Only 50% of the boys demonstrated a discernable VB2, and the VB2 of this group was not significantly different from that of the adults.
Panagiota Klentrou, Mary Lou Nishio, Michael Plyley and Brock University
Gregory D. Wells, Jane Schneiderman-Walker and Michael Plyley
The purpose of this research was to develop a comprehensive normative database of the physiological characteristics of elite swimmers. Data were obtained from 195 elite swimmers (89 males and 106 females) ages 12 to 18 years. Six protocols were used to measure variables in the following categories: descriptive characteristics, cardiovascular, respiratory, strength and power, body composition, and anthropometry. Significant effects of gender and age were identified for a number of variables. These data could be used for the physiological assessment and talent identification of swimmers in comparison with other populations.