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Official Journal of the American College of Sports Medicine ERS guidelines. Maximal inspiratory and expiratory pressures were also determined. Data were analyzed between groups by independent t-tests. The relationships between variables were determined by linear regression analysis. rEsuLTs: There were no meaningful relationships between pulmonary function parameters and RPB during constant load cycling within the groups or when combined. Differences in maximal voluntary ventilation between the -DOE (112±13) and +DOE (104±15) groups approached significance (p=0.0553). Only maximal expiratory pressure reached significance (p=0.0258) between the groups (108±26 %predicted and 94±22, respectively). CONCLusION: As in previous studies, pulmonary function, with only a few exceptions, does not differ between otherwise healthy obese women without vs. with DOE. Supported by NIH Grant Funding #HL096782 and The King Charitable Foundation Trust. 1748 Board #6 May 30, 3:15 PM - 5:15 PM Impact of Expiratory Flow Limitation on Performance at simulated altitude Joshua C. Weavil, Jonathon L. Stickford, Joseph W. Duke, Robert F. Chapman, FACSM, Joel M. Stager, FACSM, Timothy D. Mickleborough, FACSM. Indiana University, Bloomington, IN. (No relationships reported) Many athletes exhibit expiratory flow limitation (FL) during heavy exercise and consequently may be additionally challenged when exercising at moderate altitude. PurPOsE: To determine how FL affects aerobic performance at modest altitude. We hypothesized that NFL athletes will be at a competitive advantage where altitudeinduced declines in SaO2 present less of a consequence than the coincident increases in ventilation and work of breathing experienced by the non-flow limited athlete. METhOds: Flow limited (FL n=7) and non-flow limited (NFL n=7) male cyclists performed three 5-km time trials on a Velotron cycle ergometer on separate days. Expired gases were measured at rest and throughout each time trial. Participants performed a familiarization trial followed by a single-blinded normoxic (FiO 2 = 0.21) and hypoxic (FiO 2 = 0.17, approximately 2000m altitude) trial in random order. Time to completion (T TT ) and average power output (P TT ) were used to assess performance. rEsuLTs: Metabolic, ventilatory, and performance measures were similar between groups (FL vs. NFL) in normoxia. However, when comparing the normoxic and hypoxic trials, the FL group had a significantly smaller (p
<strong>Thursday</strong>, May 30, 2013 S338 Vol. 45 No. 5 Supplement collegiate runners during treadmill locomotion. METhOds: Subjects gave informed consent to procedures approved by the Eastern Michigan University CHHS Human Subject Review Committee. 9 female (22.4±2.2yr, 52.2±5.5kg, 55.9±6.8ml/kg/min) and 8 male NCAA D-I intercollegiate runners (23.6±2.2yr, 69.1±5.9kg, 67.4±6.7ml/kg/min) performed incremental VO2max trials while wearing lumbar mounted HRA (Microstrain, VT; 617 Hz). Aggregate acceleration for VT, AP, and ML axes were recorded and Euclidian resultants were computed (RES). Trials started at 8kph and increased 2 kph every 3 min until exhaustion. Group comparisons were made from 12-16 kph, as all subjects completed these stages. Axial root mean square (RMS) and ratio of RMS/RES (RA) were compared between women and men to identify differences in running mechanics between groups. Expired gases were collected using an Oxycon Mobile (Viasys, CA). VO2 and RER were used to determine O2 cost (O2C) and energy expenditure (EE). MANOVAs were performed using PASW 17.0 (SPSS, IL) α = 0.05. rEsuLTs: VT (p=0.032) and VT ratio (VT/RES) (p=0.002) were significantly lower in women than men. ML and AP accelerations were not significantly different between groups. During tests, VO2, RER, O2 Cost, and EE were significantly higher for women (46 ml/kg/min, 1.00, 180.87 ml/kg/min, 0.913 kcal/kg/min) compared to men (43.728 ml/kg/min, 0.924, 161.9 ml/kg/min, 0.799 kcal/kg/min) across all speeds. CONCLusION: These data show that women accelerate less in the VT axis than men. At the same time, they are less metabolically economical in all measures (VO2, RER, O2C, and EE) then men. Therefore, gender differences in running economy between similarly trained runners could come more from the VT accelerations rather than the AP or ML. 1753 Board #3 May 30, 3:15 PM - 5:15 PM Precooling By Ice slurry Ingestion reduces Core Temperature and Thermal sensation during 5km running Emily J. Sauers, Nicole A. Lisicky, Donald Cummings, Molly Winke, Chad A. Witmer, Shala E. Davis, FACSM. East Stroudsburg University, East Stroudsburg, PA. (No relationships reported) Previous evidence suggests that precooling an athlete’s core temperature prior to physical activity may reduce the negative effects of heat on performance PurPOsE: The purpose of the present study is to examine the impact of pre-race ice slurry ingestion on core temperature and performance in competitive well-trained runners. METhOds: The subjects in this study included 14 competitive male (n=11; age: 28.00±1.7yrs; height: 69.50±1.4in; weight: 70.42±2.7kg; body fat: 10.92±1.4%; VO2max: 67.70±1.9 ml/kg/min) and female (n=3; age: 33.00±5.0yrs; height: 65.00±0.6in; weight: 58.4±2.9kg; body fat: 15.87±1.7%; VO2max: 58.57±2.3ml/ kg/min ) distance runners currently involved in an endurance-training program. All runners completed two 5km race, consuming either cold water (CW; 4°C) or an ice slurry (IS; -1°C) prior to the trial. Core temperature was recorded using an ingestible capsule containing a radiotelemetry temperature sensor (VitalSense System, Philips Respironics, Bend, Oregon) 4 hours before each race. Thermal sensation was assessed prior to warm-up, after warm-up, and immediately after trial completion. Urine specific gravity will be determined by refractometer (Antago, Bellvue, WA). A oneway repeated measures ANOVA was used to evaluate performance, core temperature, thermal sensation and RPE. Significance was defined as p
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