James Fiedler
Universities Space Research Association
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Featured researches published by James Fiedler.
Journal of Applied Physiology | 2014
Robert Ploutz-Snyder; James Fiedler; Alan H. Feiveson
if you have ever competed for external research support, you know the drill. Every grant starts with some fantastic ideas that are honed, filtered, and shaped into a grant proposal. Primary aims lead to hypothesis statements, definitions of primary outcomes, and a statistical analysis section. At
Aviation, Space, and Environmental Medicine | 2014
Jessica M. Scott; Kyle J. Hackney; Meghan E. Downs; Jamie Guined; Robert Ploutz-Snyder; James Fiedler; David A. Cunningham; Lori L. Ploutz-Snyder
BACKGROUND Exercise countermeasures designed to mitigate muscle atrophy during long-duration spaceflight may not be as effective if crewmembers are in negative energy balance (energy output > energy input). This study determined the energy cost of supine exercise (resistance, interval, aerobic) during the spaceflight analogue of bed rest. METHODS Nine subjects (eight men and one woman; 34.5 +/- 8.2 yr) completed 14 d of bed rest and concomitant exercise countermeasures. Body mass and basal metabolic rate (BMR) were assessed before and during bed rest. Exercise energy expenditure was measured during and immediately after [excess post-exercise oxygen consumption (EPOC)] each of five different exercise protocols (30-s, 2-min, and 4-min intervals, continuous aerobic, and a variety of resistance exercises) during bed rest. RESULTS On days when resistance and continuous aerobic exercise were performed daily, energy expenditure was significantly greater (2879 +/- 280 kcal) than 2-min (2390 +/- 237 kcal), 30-s (2501 +/- 264 kcal), or 4-min (2546 +/- 264 kcal) exercise. There were no significant differences in BMR (pre-bed rest: 1649 +/- 216 kcal; week 1: 1632 +/- 174 kcal; week 2:1657 +/- 176 kcal) or body mass (pre-bed rest: 75.2 +/- 10.1 kg; post-bed rest: 75.2 +/- 9.6 kg). DISCUSSION These findings highlight the importance of energy balance for long-duration crewmembers completing a high-intensity exercise program with multiple exercise sessions daily.
Journal of Applied Physiology | 2014
Robert Ploutz-Snyder; James Fiedler; Alan H. Feiveson
to the editor: We thank Drs. Bacchetti and Shelhamer (see Ref. [1][1]) for their comments, and we are glad to see they share our opinion that traditional methods and defaults for justifying sample size are overused and underscrutinized ([2][2]). We have become increasingly convinced of this problem
Medicine and Science in Sports and Exercise | 2011
Jeffrey W. Ryder; Roxanne E. Buxton; Elizabeth Redd; Melissa Scott-Pandorf; Kyle J. Hackney; James Fiedler; Robert Ploutz-Snyder; Jacob J. Bloomberg; Lori L. Ploutz-Snyder
Performance Jeffrey W. Ryder, Roxanne E. Buxton, Elizabeth Redd, Melissa Scott-Pandorf, Kyle J. Hackney, James Fiedler, Robert J. Ploutz-Snyder, Jacob J. Bloomberg Lori L. Ploutz-Snyder, FACSM. Universities Space Research Association, Houston, TX, University of Houston, Houston, TX, Wyle Integrated Science and Engineering Group, Houston, TX, Syracuse University, Syracuse, NY, NASA Johnson Space Center, Houston, TX PURPOSE: The ability to predict task performance using physiological performance metrics is vital to ensure that astronauts can execute their jobs safely and effectively. This investigation used a weighted suit to evaluate task performance at various ratios of strength, power, and endurance to body weight. METHODS: Twenty subjects completed muscle performance tests and functional tasks representative of those that would be required of astronauts during planetary exploration (see table for specific tests/tasks). Subjects performed functional tasks while wearing a weighted suit with additional loads ranging from 0-120% of initial body weight. Performance metrics were time to completion for all tasks except hatch opening, which consisted of total work. Task performance metrics were plotted against muscle metrics normalized to “body weight” (subject weight + external load; BW) for each trial. Fractional polynomial regression was used to model the relationship between muscle and task performance. RESULTS: The R values for normalized muscle performance versus task performance are presented in the table below. Supine Seat Egress and Walk Object Pick Up and Carry Ladder Treadmill Hatch Opening
Experimental Brain Research | 2010
Ajitkumar P. Mulavara; Alan H. Feiveson; James Fiedler; Helen S. Cohen; Brian T. Peters; Christopher A. Miller; Rachel Brady; Jacob J. Bloomberg
European Journal of Applied Physiology | 2013
Jeffrey W. Ryder; Roxanne E. Buxton; Elizabeth Goetchius; Melissa Scott-Pandorf; Kyle J. Hackney; James Fiedler; Robert Ploutz-Snyder; Jacob J. Bloomberg; Lori L. Ploutz-Snyder
Archive | 2018
Alan H. Feiveson; James Fiedler; Stuart M. C. Lee; Matthew Koslovsky; Michael B. Stenger; Steven H. Platts
Statistical Software Components | 2014
James Fiedler
Archive | 2014
Alan H. Feiveson; James Fiedler; Stuart M. M. Lee; Christian M. Westby; Michael B. Stenger; Steven H. Platts
Archive | 2014
Robert Ploutz-Snyder; James Fiedler; Alan H. Feiveson