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Dive into the research topics where Peter Tikuisis is active.

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Featured researches published by Peter Tikuisis.


Ergonomics | 2003

Effect of caffeine on target detection and rifle marksmanship

R. Gillingham; Allan A. Keefe; Jocelyn Keillor; Peter Tikuisis

Thirteen healthy and rifle-trained male military reservists performed shooting sessions on two separate occasions 1 h following the ingestion of placebo or 300 mg of caffeine. Shooting included both friend–foe (FF) and vigilance (VIG) tasks, and were performed in the following order: two FF sequences (4 min each), four VIG sequences (30 min each), and two additional FF sequences. The shooting sessions lasted approximately 2.5 h under outdoor conditions (air temperature range from − 3 to 14°C) and were held 48 h apart in a counter-balanced order. Performance measures during the shooting session included engagement time, friend–foe discrimination, and marksmanship accuracy and precision. Assessments of thermal comfort, tiredness, and debilitating symptoms preceded and followed the shooting session, while a self-assessment on performance was administered post-shooting only. Blood was sampled immediately prior to the beginning of the shooting session and was used to determine plasma caffeine, cortisol, and testosterone levels. Engagement times were faster and certain measures of accuracy and precision were impaired during the later FF and VIG sequences. However, caffeine ingestion had no affect upon any of the marksmanship measures, although it did alleviate cold stress and tiredness. That caffeine ingestion did not affect target detection and rifle marksmanship is a finding that differs from other studies, and is explained by a beneficial arousal caused by the mild level of cold stress experienced by the participants.


Military Psychology | 2009

Target detection, identification, and marksmanship during battlefield noise in a synthetic environment.

Peter Tikuisis; Michael Ponikvar; Allan A. Keefe; Sharon M. Abel

This study was conducted to determine the impact of noise on target detection, identification, and marksmanship (TDI&M) and to examine the effectiveness of a monetary reward to improve performance. Twenty active duty male soldiers participated in a non-reward and reward trial, each comprising three time blocks of two alternating 20-minute sessions, one with 87-dBA battlefield noise and the other relatively quiet. Each session involved 15 minutes of TDI&M testing followed by 5 minutes of rest. Neither noise, time on task, nor reward caused any noteworthy changes in TDI&M performance, except for foe target engagement time (ET). It appears that subjects purposely increased ET over the duration of the task to improve their hit accuracy but did not succeed in doing so. The monetary incentive to improve performance was also ineffective, because the subjects applied a similar “best” effort during the no-reward trial prior to this manipulation.


Aviation, Space, and Environmental Medicine | 2004

Caffeine restores engagement speed but not shooting precision following 22 h of active wakefulness.

Peter Tikuisis; Allan A. Keefe; Tom M. McLellan; Gary H. Kamimori


Aviation, Space, and Environmental Medicine | 2004

Acute caffeine intake before and after fatiguing exercise improves target shooting engagement time.

Robin L. Gillingham; Allan A. Keefe; Peter Tikuisis


Aviation, Space, and Environmental Medicine | 2002

Investigation of rifle Marksmanship on simulated targets during thermal discomfort

Peter Tikuisis; Allan A. Keefe; Jocelyn Keillor; Stuart Grant; Richard F. Johnson


Undersea biomedical research | 1988

Role of body fat in the prediction of the metabolic response for immersion in cold water.

Peter Tikuisis; Richard R. Gonzalez; Robert A. Oster; K. B. Pandolf


Aviation, Space, and Environmental Medicine | 2004

Exercise effects during diving and decompression on postdive venous gas emboli.

Louis W. Jankowski; Peter Tikuisis; Ronald Y. Nishi


Aviation, Space, and Environmental Medicine | 2005

Heat strain at high levels does not degrade target detection and rifle marksmanship.

Peter Tikuisis; Allan A. Keefe


Aviation, Space, and Environmental Medicine | 1988

Prediction of human thermoregulatory responses and endurance time in water at 20 and 24 degrees C.

Peter Tikuisis; Richard R. Gonzalez; K. B. Pandolf


Aviation, Space, and Environmental Medicine | 2007

Effects of cold strain on simulated sentry duty and marksmanship.

Peter Tikuisis; Allan A. Keefe

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K. B. Pandolf

United States Army Research Institute of Environmental Medicine

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Gary H. Kamimori

Walter Reed Army Institute of Research

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