Trials were conducted 2 hr following a standardized breakfast, and 250 ml of water was consumed at three time-points during the trials. Subjects received no encouragement or feedback during the trials, other than being permitted to view distance completed in the trial. RESULTS: 20 km times (T1=44.9±4.2; T2=44.8±4.6; T3=44.2±4.5 min) displayed coefficients of variation (CV) of 1.88% between trials 1-2 and 1.44% between trials 2-3. Power output during the same trials (232±37; 233±41; 238±41 W) exhibited CV’s of 3.61% and 2.64% respectively. During the final 5 km climb (17.5±2.2; 17.3±2.3; 17.0±2.4 min), CV’s for time were 3.17% between trials 1-2 and 2.36% for trials 2-3. Power output (239±35; 243±40; 247±40 W) had corresponding CV’s of 3.69 % and 3.15%. Power output (W) over the 20 km trial was strongly correlated (p < 0.05) with time (r = 0.947), particularly when expressed per kgBW (r = 0.960). During the final 5 km climb the correlations were r = 0.920 (W) and r = 0.977 (W/kgBW). CONCLUSIONS: Good reproducibility was observed for power output and performance times between repeated trials, particularly between trials 2-3. Correlations between power output and time were strong, and variations in these correlations between 20 km and final 5 km segments occurred in logical fashion (i.e. correlations between power output and time during the climbing segment were notably stronger when expressed as W/kgBW). These findings provide support for the reliability and validity of simulated trial times calculated from proprietary software. Supported by a research grant from Shaklee Corporation.
2642
Board #250 June 3 9:00 AM - 10:30 AM Learning Effect and Reliability of Isokinetic Measurements at Different Movement Velocities Rafael Cunha1, Rodrigo Carregaro1, Saulo Martorelli1, André Martorelli1, Carlos Ernesto2, Diego Jesus1, Rodrigo Celes1, Lee Brown, PhD, FACSM3, Martim Bottaro, PhD1. 1University of Brasília, Brasília, Brazil. 2Catholic University of Brasília, Brasília, Brazil. 3California State University, Fullerton, CA. Email:
[email protected] (No relationships reported)
The assessment of muscular strength is essential for understanding the performance capacity of an individual. Muscle function is typically measured as strength, and the isokinetic device has long been recognized as the benchmark of strength measurement. However, many internal and external factors can have undesirable effects on isokinetic test results. One factor may be a learning effect at different velocities due to a lack of familiarization. PURPOSE: To examine the learning effect and reliability of isokinetic knee extension (KE) measurements at different movement velocities. METHODS: 10 healthy young men (19.1 ± 1.1 yrs; 1.8 ± 0.1 m; 75 ±18 kg), with no previous experience with isokinetic testing were measured across 3 days separated by 72 hours each. They performed 2 sets of 4 maximum concentric isokinetic KE repetitions at velocities of 60°.s-1, 120°.s-1, 180°.s-1, 240°.s-1 and 300°.s-1; randomly assigned. Statistical evaluation of the data was measured using a 3 x 5 repeated measures analysis of variance [days (1, 2, and 3) x velocities (60, 120, 180, 240, and 300°.s-1)] and intraclass correlation coefficients (ICC) for all peak torque (PT) measurements. RESULTS: There was no interaction of day by velocity, and no significant main effect for day. The PT between days varied from 263.1 ± 69.0 to 254.5 ± 61.8 N.m at 60°.s-1; 222.0 ± 52.7 to 216.2 ± 32.6 N.m at 120°.s-1; 190.6 ± 45.9 to 191.6 ± 43.5 N.m at 180°.s-1; 169.8 ± 38.6 to 163.3 ± 32.5 N.m at 240°.s-1 and 151.9 ± 38.1 to 153.9 ± 33.9 N.m at 300°.s-1. ICC values varied from 0.82 to 0.96 for all velocities tested. CONCLUSION: These results demonstrate excellent reliability of isokinetic PT across a wide velocity spectrum in naïve subjects. There was also no systematic learning effect over time when comparing the 3 measurements. In summary, one day of familiarization appears to be sufficient for concentric KE isokinetic testing at velocities ranging from 60 to 300°.s-1 in young naïve males.
2643
Board #251 June 3 9:00 AM - 10:30 AM Specific Rating Scale For Evaluating Back Roll Fall Martin Zvonar, Zdenko Reguli, Michal Vit. Faculty of Sport Studies, Brno, Czech Republic. (Sponsor: WeimoZhu, FACSM) Email:
[email protected] (No relationships reported)
PURPOSE: To create created iconic-symbolic model of back roll fall and specific rating scale that was verified for content validity and inter-rater reliability. METHODS:We used Delphi method for making descriptive model and specific binomic rating scale. Five combative sport experts were intentionally selected. Descriptive model was verified and re-builded to iconic-symbolic model. 116 students falls were videotaped and evaluated by both experts (n=5) and physical education teachers (n=51). Kendall rank correlation coefficient and t-test were used to test inter-rater reliability among experts and between experts and physical education teachers. RESULTS: We regard agreement of all five experts using Delphi method in the ten items rating scale as corroboration of content validity. Order of recorded falling techniques set by sum of correctly performed selected items is in the every expert rating the same. Frequency of congruence was 93 % in all selected items of rating scale. Inter rater reliability among experts was significant at level p=0.01. Order of recorded falling techniques set by sum of correctly performed selected items is in both experts and physical education teachers group the same. Kendal tau was 0.84 that is significant at level p=0.01. There is no difference between male and female teachers scaling. CONCLUSIONS:We regard specific rating scale as objective diagnostic tool according to the martial arts/combat sports experts and physical education teachers inter-rater reliability on the stipulated significance.
E-38
Free Communication/Poster - Vascular Function JUNE 3, 2011 7:30 AM - 12:30 PM ROOM: Hall B
2644
Board #252 June 3 8:00 AM - 9:30 AM The Impact of Pulmonary and Peripheral Vascular Change from Particulate Matter Inhalation on Exercise Performance Paul T. Cutrufello1, Kenneth W. Rundell, FACSM2, James M. Smoliga3, Georgios A. Stylianides1. 1The University of Scranton, Scranton, PA. 2Pharmaxis Inc., Exton, PA. 3Marywood University, Scranton, PA. Email:
[email protected] (No relationships reported)
Particulate matter (PM) inhalation has been associated with increased morbidity and mortality among susceptible populations, however, only recently has athletic performance among healthy subjects been investigated. PM inhalation has been shown to result in vasoconstriction of both the pulmonary and peripheral vasculature, yet no present study has investigated the effects of PM inhalation on both performance and the vasculature.
732
Copyright © 2011 by the American College of Sports Medicine. Unauthorized reproduction of this article is prohibited.
