Browsing by Author "Gasier, Heath"
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Item Open Access Effects of caffeine on exercise duration, critical velocity, and ratings of perceived exertion during repeated-sprint exercise in physically active men(International Journal of Exercise Science, 2021-04-01) Stein, Jesse; Gasier, Heath; Goodman, Blake; Ramirez, Melitza; Delatorre, Blanca; Beattie, Cassandra; Barstow, Thomas; Heinrich, KatieItem Open Access Finished with training, now what? A new scientist's perspective(The Journal of Healthcare, Science and the Humanities, 2012-06-01) Gasier, HeathItem Open Access Increased Resistance during Jump Exercise Does Not Enhance Cortical Bone Formation(Medicine & Science in Sports & Exercise, 2014-05) Boudreaux, Ramon; Swift, Joshua; Gasier, Heath; Wiggs, Michael; Hogan, Harry; Fluckey, James; Bloomfield, SusanItem Open Access Oxidative stress, antioxidant defenses and nitric oxide production following hyperoxic exposures(Undersea & Hyperbaric Medicine, 2013-04-01) Gasier, Heath; Fothergill, DavidLittle data exist on the dose-response relationship between the partial pressure of inspired oxygen (PiO2) and the cellular oxidative stress response in humans. The objective of this study was to determine the effects of PiO2 on lipid peroxidation, antioxidant enzyme activity and nitric oxide (NO) production. Twelve healthy male divers breathed 100% O2 in a hyperbaric chamber for two hours at 1 (101 kPa), 1.5 (152 kPa) and 2 (203 kPa) atmospheres absolute (atm abs). Venous blood was collected pre-, within 15 minutes post-, one and two hours post-hyperoxic exposures to determine changes in plasma and erythrocyte lipid peroxidation (thiobarbituric acid reactive substances-TBARS), antioxidant enzyme activity (superoxide dismutase-SOD), catalase-CAT, glutathione peroxidase-GPx), and plasma NO production (L-arginine [L-Arg], asymmetric dimethylarginine-ADMA, and nitrites). There were minor changes in TBARS and mixed responses in plasma and erythrocyte CAT and GPx activity. Plasma L-Arg increased following 1 and 1.5 atm abs exposures, yet ADMA and nitrites were unchanged. Only erythrocyte CAT and plasma GPx activity, and plasma L-Arg/ADMA demonstrated a significant PiO2 dose-dependent relationship. Two-hour hyperoxic exposures at 1-2 atm abs of O2 results in mixed oxidant-antioxidant responses and unaltered NO production. Moreover, there does not appear to be a strong systemic dose-dependent oxidative stress response at these hyperoxic exposuresItem Open Access The effects of a carbohydrate-protein drink on performance and mood in U.S. Pararescue trainees(JEPonline, 2010-06) Gasier, Heath; Olson, CraigCarbohydrate-protein (CHO-PRO) beverages have been reported to improve endurance performance; however, no studies have been conducted on elite military combatants in a field setting in a fed state. Thus, the primary objective of this study was to evaluate the effects of a CHO-PRO supplement on physical performance and mood in U.S. Air Force Pararescue indoctrination trainees. Eight, healthy U.S. Air Force Pararescue indoctrination trainees completed a double-blind, randomized crossover study. Following a morning meal (592 kcal), subjects completed a 2000 m swim, physically demanding water activities, calisthenics (push-ups, pull-ups, curl-ups and flutter-kicks), a 6.4 km run, and a 400 m exhaustive run. Supplements (600 ml x 5 doses) were provided throughout the study and consisted of a placebo (PLA), an 8.9% carbohydrate solution (CHO), and a 7.22% carbohydrate/1.81% protein solution (CHO-PRO). Times (minutes and seconds) and repetitions were used to assess physical performance, and subjective mood states were determined using the Profile of Mood States Questionnaire (POMS). No differences were observed between the CHO-PRO, CHO, and PLA groups on any of the physical performance measures or mood states. These results suggest that, in the fed state, a CHO-PRO beverage does not enhance physical performance or mood during a series of physically demanding activities lasting < 1 h in duration in U.S. Air Force Pararescue indoctrination trainees.