S64 2005 Conference Proceedings Determinants of Left Ventricular Mass by Doppler Ultrasound in Boys and Girls Peralta-Huertas, Jose F; Mark Rakobowchuk, Alayna Banach, Debbie O'Leary, Maureen MacDonald, and Panagiota Klentrou. Brock University; McMaster University This study examined factors contributing to the differences in left ventricular mass (LVM) as measured by Doppler ultrasound in children. Fourteen boys and 10 girls, ages 10.3 ± 0.3 years, participated in the study. Height and weight were measured, and relative body fat (%BF) was estimated from skinfold thickness. Weekly energy expenditure (EnE) was calculated via a Physical Activity Questionnaire, and sexual maturation was self-as- sessed using the Tanner scale. V0 2 max was measured on a cydoergometer. Cardiac mass was measured by Doppler echocardiography using a 3.S-MHz probe. Images of cardiac structures were taken using B-Mode and were then translated to M-Mode. There were no significant difference in absolute LVM and LVM adjusted for B SA (LVMad) between boys and girls. LVMad was correlated  � O.OS) with size, maturation, %BF, V0 2 max, and EnE. In boys, lean body mass (LBM) alone explained up to 60% of the variance in LVMad, while weight was the single strongest predictor of LVMad ( = 0.7S) for girls. LBM, maturation, and EnE together can explain up to 6S% and 92% of the variance in LVMad in boys and girls, respectively. Assessment of the Reliability of the FAST Using a Test-Retest Design and the Intraclass Correlation Coefficient Petrella, N.J .; B .E. Faught, W.J. Montelpare, M. Nystrom, and M.J. Plyley. Dept. of Ap- plied Health Sciences, Brock University The Faught Aerobic Skating Test (FAST) was designed as an on-ice continuous skat- ing protocol for estimating aerobic capacity of hockey players. The present study measured the reliability of the FAST final stage completed (f-stage) and the player's maximum heart rate (FAST-HR) upon completion of the FAST in a test-retest design using the intraclass correlation coefficient (lCC) statistical analysis. Sixteen male and female minor bantam hockey players (mean age 1 2.94 ± O.2S) performed the FAST on two occasions exactly 1 week apart at the same location and time of day. The players used minimal hockey equip- ment including skates, helmet, gloves, stick, and elbow pads, and the delivery of instruc- tions was the same at both trials. FAST stage and FAST maximum heart rate were recorded at each trial and evaluated with the intraclass correlation coefficient procedure. The results showed that the f-stage was statistically reliable (lCC = .808, p < .00 1), while FAST-HR was not (ICC = .01) . S uch findings have implications in the administration of the FAST. The stability of the f-stage is further support for the use of this estimate as an essential component in measuring aerobic capacity with the FAST. Conversely, FAST-HR which was earlier shown to be less important in the estimation of aerobic capacity with the FAST, was here shown to be unreliable. The present study provides additional support for the application of the FAST as a reliable on-ice measure of aerobic capacity. Development of an Ice Skating Protocol to Predict Maximal Oxygen Uptake in Hockey Players Petrella, N .J .; B .E. Faught, W.J. Montelpare, M. Nystrom, and M.J . Plyley. Dept. of Ap- plied Health Sciences, Brock University In assessing the physiological capacity of ice hockey players, researchers have often reported the outcomes from different anaerobic skate tests and the general physical fitness Can. J. Appl. Physiol. Downloaded from www.nrcresearchpress.com by Brock University on 01/28/14 For personal use only.