Chapter 13 - Human Overload + Underload Flashcards
Stress can be cumulative and ……..
subjective
Eustress is
Cope with the stress
Learn from the stress
good kind of stress
Gives adaption
Distress is
out of control
lose ability to learn
Environment stress is
when external factors put a strain on homeostasis
Physiological stress has two categories
internal = hunger, thirsty, pain fatigue and lack of sleep
external
External has x4 subcategories
temperature
noise
vibration
humidity
Average temps for humans and max hot and cold
20 degrees
under 15 gives loss of control
over 30 sweaty, increase hr and blood pressure
what is the body’s normal internal temperature
37 degrees
Body temp less than 35 degrees has what effects
HR increase energy used look blue restrict blood flow - frost bite feeling of apathy confused
below 32 and stop shivering, coma and death
Above 38 degrees become hyperthermic which includes
heat exhaustion - lose water and salt
heat stroke - body can’t cool itself
bloody pressure decreases so HR increases
40 + body starts swell and death
Noise does what to performance
decreases it 90 db and above
Vibration what happens at 1-4 HZ 4-10 HZ 8-12 HZ 10-20 HZ 30-40 HZ
1-4Hz: Resonance of skull (breathing interfered and
may affect visual acuity)
̶ 4-10Hz: Abdominal and chest pain
̶ 8-12Hz: Backache
̶ 10-20Hz: Headache, speech problems, decreased vision, eye
strain, throat pain
̶ 30-40Hz: Decreased visual acuity.
Humidity levels-
what are comfortable levels
What flight compartments usual levels
40-60%
10-20 % can 5%
if low can dry out the body
counters drinking water and aqueous creams
How long does it take to acclimates to a hot and humid climate
2 weeks
Number 1 life stressor is
Death of a spouse
