Human Factors Flashcards
Caffeine is regulated by the neurotransmitter ________ in the central nervous system, specifically in the forebrain. It is not a direct stimulant per se, as it allows the body’s own stimulating neurotransmitters, including glutamate and dopamine, to work without restraint.
Adenosine.
Under normal circumstances, caffeine has a half life of ________, with a range from 2 to 10 hours.
3.5 hours
The Aerospace Medicine Association position supports caffeine as an effective aviation fatigue countermeasure and recommends less than _________mg of caffeine in a 24 hour period and not within four hours of going to sleep.
1000mg.
Caffeine also induces a temporary diminution of sleep deprivation or sleep demand. These effects are achieved at a daily consumption of _______mg of caffeine, or a single ________mg dose. Since a cup of coffee contains about 100mg of caffeine while popular cafe’ coffees such as Starbucks range from 250-550mg a cup. A cup of tea contains about 30mg, and a cola drink about 50mg, therefore maximum levels are easily achieved.
300mg daily consumption or a single dose of 200mg.
What is the acute human fatal dose of caffeine?
What dose does toxicity occur?
10 grams
1 gram
Serious side effects such as atrial fibrillation, epilepsy, and toxicity have been reported with what beverages containing Guarana?
Energy drinks such as Red Bull, Full Throttle, and Monster.
While some protective benefits of caffeine consumption have been demonstrated, a consideration for older female pilots is the association between high caffeine consumption (> 6 cups per day) with concurrent postmenopausal hormone therapy and a fourfold increase in __________ disease.
Parkinson’s
True or False. Methylated xanthine medications (caffeine, theophylline, and aminophylline) can interfere with stress testing.
True
Which of the following poses no significant risk?
a) Airman who infrequently drinks coffeee presents with anxiety, palpitations, and elevated blood pressure after visiting a locale cafe’ and enjoying espresso.
b) Airman who is a habitual coffee drinker is scheduled for an ECG tomorrow.
c) Airman who is a smoker, reports using three (750mg total intake) caffeinated energy drinks as a fatigue countermeasure for shift work.
d) Airman with normal glucose tolerance who is a nonsmoker reports drinking eight cups of coffee a day and a No-Doze nightly on the evening shift.
D. The airman is within the 1,000 mg of caffeine a day for alertness for his nightshift.
Which of the following statements regarding stress is true?
A) The effects of stress are expressed only through physiological manifestations, such as rapid heart rate.
B) The same stressor will affect a specific person the same way, no matter when it occurs.
C) The same stressor can bother some people more than others.
D) Each stressor is distinct; stressors do not have additive effects.
C) the same stressor can bother some people more than others.
A 49- year old private pilot seeking a renewal of his third class medical certificate presents with a complaint of increasing fatigue. He recently had a complete workup with his family physician, where nothing was remarkable. His work schedule is stressful and demanding leading to difficulties falling asleep. To aid in coping with the long work hours he is a heavy coffee drinker. What countermeasures should the pilot employ to decrease his levels of fatigue? A) If he has difficulty falling asleep at night he should remain in bed to take advantage of the opportunity to rest. B) Avoid exercise, as it tends to increase arousal and reduce the quality of sleep. C) The pilot should avoid consumption of caffeine within 4 hours of going to bed. D) Naps should be avoided as they can interfere with sleeping at night.
C) The should avoid consumption of caffeine within four hours of bedtime.
The primary source of information we use to orient ourselves in the 3- dimensional aerospace environment is ________.
Visual (90%)
Roughly ______ % of all civilian fatal aircraft accidents are attributed to spatial disorientation.
14%
Of crashes involving spatial disorientation the fatality rate is __________.
90%
Most modern air forces have a fairly consistent loss of _________% of pilot trainees for persistent motion sickness.
1-2%.
