WorldCat Identities

Cardenas, Rebecca

Works: 13 works in 14 publications in 1 language and 14 library holdings
Publication Timeline
Most widely held works by Rebecca Cardenas
The world of bellydance : featuring artists from around the globe( Visual )

1 edition published in 2008 in English and held by 1 WorldCat member library worldwide

Features popular belly dancers from around the world performing live on stage
Daytime Sleep Aids and Nighttime Cognitive Performance( )

1 edition published in 2005 in English and held by 0 WorldCat member libraries worldwide

Air and ground crews are often given rest opportunities at atypical times, outside of a normal entrained circadian sleep period. Due to normal human biology, this practice often leads to delayed, thus shortened, sleep as well as restless sleep. In such cases, a sleep promoting or "No-Go" medication may be prescribed to promote a more restorative crew rest. This study compared two doses of the hypnotic zolpidem, two doses of melatonin and placebo for their effects on daytime sleep, on nighttime cognitive performance and on mood in an operationally and militarily relevant paradigm. The participants worked all night. Subsequently, an Early Group slept from 0800-1600 and a Late Group slept from 1400-2200. The participants worked all night again. Measures included polysomnography, simple and complex cognitive task performance, vigilance, subjective reports, salivary melatonin, and vital signs. Neither zolpidem nor melatonin was successful in improving daytime sleep compared to placebo. Participants slept longer under the medicated treatments, but it was not statistically significant. Sleep inertia was deepened by the use of zolpidem and may prolong degraded performance, sleepiness and fatigue. In this study, there were no advantages for morning or afternoon sleepers for nighttime alertness, mood or performance. The Foret & Lantin (1972) findings of 34 hours of sleep during the day do not appear to hold for sleep-deprived people sleeping under ideal conditions. For two consecutive work nights, ideal daytime sleeping conditions appear to provide nearly as much sleep as a sleep aid and without any risk to nighttime performance or side effects
Sleep Deprivation in Humans, Immunodepression and Glutamine Supplementation( )

1 edition published in 2005 in English and held by 0 WorldCat member libraries worldwide

This report results from a contract tasking University of Oxford as follows: The Grantee will investigate the immunological response of subjects to one night of sleep deprivation with respect to the following areas (I) Are the cytokines linked with eosinophils neutrophils and lymphocytes cell types which are known to be affected by sleep deprivation changed in terms of intracellular cytokine production? (2) What is the psychoneurological link between the apparent immunodepression and cognitive impairment? (3) What is the mechanism for the noticeable decrease in plasma leptin? These results have important implications for long haul aircrews troops deployed across time zones and shift workers and may lead to changes in immunization practices in order to optimize immune responses In combination with data on individual immune phenotypes emerging from other studies it may be possible to provide protective and supplemental measures to boost immune responses under stress
Assessing the Performance Impact of G-Forces: Design of the Acceleration Performance Assessment Simulation System(A-PASS)( )

1 edition published in 1995 in English and held by 0 WorldCat member libraries worldwide

A performance assessment system for use on a man-rated centrifuge is discussed. The problem of measuring human performance during high G flight simulation is addressed. This research addressed the fundamental problem of using laboratory data to assess the operational military impact (OMI) of physiological stresses. First, a battery of flight task simulations was conceptualized, based on current performance assessment theory. Second, a procedure was demonstrated for converting laboratory measures from this battery into measures of OMI. Specifically, performance data were entered into high-fidelity computer models of aircraft missions, yielding estimates of the military impact of stressors on human performance (e.g., kill probability, circular error - CEP, survivability, etc.). In the pilot demonstration, the effect of a hypothetical stressor on a pop-up air-to-ground maneuver in the F4E aircraft was evaluated. In the undegraded state, the CEP was 25.0 feet (S.D. 10.8 feet). In the degraded state, the CEP was 50.1 feet (S.D. 21.9 feet). This demonstration proved the feasibility of providing operationally meaningful metrics based on laboratory performance data
Measurement of AWACS Team Performance in Distributed Mission Scenarios( )

1 edition published in 1999 in English and held by 0 WorldCat member libraries worldwide

Distributed Mission Training (DMT) enables participants to perform within a virtual battlespace created through networking of several high-fidelity simulations. In a recent exercise, ROADRUNNER 98, several agencies interacted to create several battlespace missions in which friendly fighter aircraft and command and control crewmembers participated as trainees, while supporting roles and enemy forces were either played by operational personnel (virtual players) or created by intelligent agent technology (constructed forces). Thus, trainees participated in complex demanding war scenarios without the usual constraints of cost, safety, and security normally associated with live-fire training. ROADRUNNER 98 was sponsored by the Air Force Modeling and Simulation Office (USAF/XOC) with the Air Force Research Laboratory, Human Effectiveness Directorate's Warfighter Training Research Division (AFRL/HEA) serving as program managers and the Theater Command and Control Simulation Facility (TACCSF) as systems integrators
Command and Control Team Performance in Distributed Mission Training Exercises( )

1 edition published in 2000 in English and held by 0 WorldCat member libraries worldwide

Distributed mission training (DMT) enables participants to perform within a virtual battlespace created by networking several high fidelity simulations. In a recent exercise, ROADRUNNER
Effects of Three Watchstanding Schedules on Submariner Physiology, Performance and Mood( )

1 edition published in 2003 in English and held by 0 WorldCat member libraries worldwide

The general rationale for this study was based upon issues of manpower, especially quality of life and personnel retention, and submarine system performance. Nine male submariners participated as research subjects, two from fast attack submarines and seven from fleet ballistic missile submarines. All participants were submarine qualified and had watchstanding experience on the 18-hour (12-and-6) schedule. The group of participants experienced three watchstanding schedules: the 18-hour Submarine watch schedule; the traditional, Maritime watch schedule; and the Alternative, compressed watch schedule (6-on, 6-off, 6-on, 12-off, 6-on, 6-off-6-on, 24-off). More was learned from the physiological measures employed in this study, especially polysomnography, than from the performance or subjective measures. After combining the results of this study with information available in the research literature about submarine watchstanding schedules dating as far back as 1949, the following schedules were recommended for further study in sea trials: the A Schedule (compressed-6); a fixed, dogged-6 schedule; and the fixed, 8-hour watch schedule
A Laboratory Evaluation of Performance Following a Daytime Nap Under Zaleplon and Placebo Conditions( )

1 edition published in 2003 in English and held by 0 WorldCat member libraries worldwide

Primary objective was to determine if zaleplon (10-mg) negatively impacted human performance, compared to placebo, after a sudden awakening from a short period (1 hour) of daytime sleep 16 volunteers, 8 males and 8 females, were formed into 4 groups of 4 participants each. The study used a repeated measures design with 2 within-subject factors drug and trial. Each participant experienced both drug conditions. Drug administration was counterbalanced and double-blinded. Performance measures (cognition and memory, balance, strength) and subjective reports were collected during every waking hour. Performance was significantly negatively impacted in the zaleplon condition up to 3-hrs post-dose. A few measures remained significantly below baseline at 3-hrs post-awakening. All measures returned to baseline by 4-hrs post-awakening. Caution is advised regarding daytime zaleplon use in operational settings involving extreme environments or emergency procedures that include higher cognitive tasks. Findings support insertion of a minimum of lO-min recovery time prier to any work activities following a daytime nap
Investigation of Complex C3 Decisionmaking under Sustained Operations: Issues and Analyses( )

2 editions published in 2002 in English and held by 0 WorldCat member libraries worldwide

In this paper we describe plans and initial progress in baseline investigations of fatigue on team performance in complex and operationally relevant task environments. Preliminary data collection used a PC-based analogue of command and control simulations. The platform was developed based on cognitive and functional analysis of C3 mission, tactics, team-member roles, and role interdependencies. Tactical scenarios were developed to capture core team coordination, decision-making and problem-solving task demands. Issues regarding measures and scenario development are identified and discussed. Preliminary findings, indicating increased resistance to fatigue effects over time, are presented. Lessons learned are noted, along with plans for subsequent research
Sensitivity of S-Cat to sleep deprivation( )

1 edition published in 2006 in English and held by 0 WorldCat member libraries worldwide

NASA has need of a rapid, reliable and non-invasive means to objectively evaluate the cognitive ability of astronauts to perform mission critical tasks, particularly during extended duration space flight One such means under consideration is the Spaceflight-Cognitive Assessment Tool (S-CAT), a tool designed to assess cognitive performance using a set of five cognitive performance tests. The current study had multiple goals, one of which was to evaluate the sensitivity of S-CAT to fatigue induced by sleep deprivation and circadian disruption. Research Hypothesis. Since S-CAT has demonstrated sensitivity to organic neural dysfunction, it was expected to show fatigue sensitivity. Methods. Two groups of eight US military pilots (ages 30-40) were deprived of sleep for 46 hrs, over two circadian performance nadirs. In addition to S-CAT, four other cognitive performance tests were performed repeatedly during the sleep deprivation period. The S-CAT battery of tasks was performed once every six hours up to the 33rd hour while the participants were in the experimental situation. Results. For all tests, the response time measures showed the greatest effects from fatigue. Two of the five S-CAT tests, the Matching to Sample and the Math tests, exhibited significant fatigue-related decrements on response time. The Matching to Sample test and the Continuous Processing test showed effects on accuracy and percent correct For Continuous Processing, 4 of 6 trials were affected, beginning after 23 hrs of wakefulness and lasting until 35 hours awake. Pilots appear to be somewhat less vulnerable to fatigue compared with data from other sleep deprivation experiments. Conclusion. It is likely that S-CAT will identify astronauts too fatigued to optimally perform sensitive missions
A Laboratory Evaluation of Zaleplon for Daytime Sleep( )

1 edition published in 2004 in English and held by 0 WorldCat member libraries worldwide

Zaleplon appears to be a prime candidate for assisting individuals in obtaining sleep in situations not conducive to rest. The primary objective of this study was to determine whether zaleplon (10-mg) effectively promoted sleep during the daytime in well rested individuals when compared to placebo. A secondary objective was to see if, while not expected, the use of zaleplon impacted the performance of these well rested indivIduals upon awakening. Twelve participants, 6 males and 6 females, participated in this study. The study was conducted using a repeated measures design with two within-subject factors: dmg (placebo/zaleplon) and trial (hourly testing during waking hours). Each participant experienced both drug conditions, with drug administration being counterbalanced and double-blinded. During a 3.5 hour nap following drug administration, polysomnographic variables were recorded to measure quality of sleep. Performance measures (cognition, memory, balance, and strength) and subjective reports were collected during every waking trial of each session. Total sleep time, and consequently, sleep efficiency, was statistically higher under zaleplon than under placebo (sleep efficiency = 87% and 76%, respectively). The majority of the gain in sleep occurred during sleep stages 3 and 4. Unexpectedly (given that the participants were well rested) a few of the cognitive performance and memory variables showed improvement after awakening under zaleplon when compared to placebo. Zaleplon, when used by rested individuals for daytime sleep, improves sleep quality
An assessment of modafinil for vestibular and aviation-related effects( )

1 edition published in 2005 in English and held by 0 WorldCat member libraries worldwide

The goal of this study was to provide data concerning both the efficacy and the safe-to-fly dosage of a relatively unique compound, modafinil. Previous studies have indicated that modafinil holds promise as an effective wake-promoting agent for military personnel assigned to sustained operations without the common side effects associated with amphetamine-like substances. The present research was conducted to examine whether 200 or 400 mg doses of modafinil have any effect upon human vestibular functioning at night, to verify its cognitive enhancement capabilities during a short-term, sleep-loss setting, and to document the presence/absence of subjective symptoms. Other measures were investigated for possible effects of over-confidence or dehydration
Development of the Situation Awareness Flight Training and Simulation Evaluation (SAFTE) System: II: Final Development, Initial Test, and Documentation of the System( )

1 edition published in 1999 in English and held by 0 WorldCat member libraries worldwide

A technology has been developed for incorporating situation awareness (SA) measures into an inexpensive flight simulator. In this Phase 2 report, the final configuration of the simulator is described in detail, the first demonstration project to determine its training and psychometric characteristics is documented, and extensive hardware/software descriptions are provided. This Situation Awareness Flight Trainer Evaluator (SAFTE) system permits an experimenter to present operationally relevant portions of aircraft missions in a laboratory desktop environment, while obtaining measures of the operator's SA embedded within the simulation. Measures of SA include spatial disorientation, awareness of aircraft present and predicted position, and several experimental metrics. In addition to the initial development, a modified SAFTE system was implemented into a human centrifuge at Brooks AFB to assess the impact of acceleration forces on pilot performance, and this development is described. Conclusions and recommendations concerning the further evolution of the SAFTE system include an assessment of the experimental SA metrics, addition of skill measures other than SA, and an evaluation of the value of this type of training for novice pilots
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English (14)