Show:
Proprioception
Postural Control
Skeletal Muscle
Alcohol
100
How would you define proprioception?
The body's ability to transmit a sense of position, analyze that information and react (consciously or unconsciously) to the stimulation with the proper movement. DEMO!
100
Discussion question: how would you define postural control and balance?
Functions requiring the constant adjustment of muscle activity and joint position to retain body weight over the base of support.
100
What are the 4 major muscles involved in posture?
abdominal, hip, legs and back muscles
100
What is the legal California blood alcohol concentration limit to operate a vehicle?
0.08%
200
Name two proprioceptors responsible for maintaining posture.
Muscle spindles, GTO, pacinian corpuscles, articular receptors
200
What are the 3 systems involved in balance?
Vestibular, proprioceptive, and visual afference
200
Discussion question: What are the differences between peripheral and central fatigue?
peripheral fatigue: inability for the body to supply insufficient energy/metabolites to the contracting muscles to meet the increased energy demand central fatigue: when the individual feels a sense of intense tiredness, lack of motivation and poor mood
200
What factors affect the rate of metabolization of alcohol between participants?
Amount of food in the stomach, the proportion of body fat, gender or the regularity of alcohol consumption.
300
Discussion question: Did the group perform better during eyes closed or eyes opened after drinking the ethanol? Why?
Eyes closed. Drinking alcohol affects your visual feedback and this hindered their balance. When their eyes were closed subjects had a better overall stability index, relative to 'eyes opened'
300
What are the 3 types of natural curves in the spine? What are the 3 most common abnormalities of the spine?
Cervical curve, thoracic curve, & lumbar curve / Lordosis, kyphosis, & scoliosis
300
What are the 4 physiological properties of skeletal muscle?
Excitability, elasticity, contractility, extensibility.
300
Under what blood alcohol concentration will you have a severe loss of balance?
>0.2%
400
What do you think you will respond to faster? a) auditory b) visual c) tactile
a) Auditory. Simple reaction times for auditory, visual, and tactile range from 120-180ms. Humans are biased towards visual stimulation!! Visual+Auditory Feedback tests were 180ms, showing a visual bias.
400
What was the relationship between postural stability and blood alcohol concentration?
No relationship!!!!
400
Discussion question: What are the type of contractions produced by skeletal muscles?
Static (isometric) and dynamic (concentric, eccentric, isokinetic, isotonic)
400
What were some of the effects of ethanol on the body as blood alcohol concentration increased?
Slower reactions, loss of motor coordination, balance & reflexes, staggering gait