DETRAINING Flashcards
Summarize the dallas bed rest study
trying to understand the physiology of what was occurring to people in bed rest - took 5 healthy normal undergrad students and put them on bed rest for 22 days. VO2 max was taken before test and periodically after that ~10 days for an 8week training program
What was the result in of the dallas bed rest study
27% drop in VO2max in 21 days
in the dallas bed rest study did it take longer for active or sedentary individuals to return to their baseline VO2
took longer for active participants
what was the finding for HR for a given exercise following the dallas bed rest study
increase in HR for a given exercise load was 27% more than it was at pretest
What causes the increase in HR for a given exercise load following 21 days of bed rest
drop in stroke volume so HR had to increase
The 3 weeks of bed rest in the dallas bed rest study (on undergrads) caused the same proportional decline in vo2max for a period of…
40 year of life
what is the first change in the cardiovascular system following bed rest is…
decrease in plasma volume
What causes the decrease in plasma volume seen with bed rest
When you are standing up right gravity makes blood sit in our lower heart, when you are lying down this changes, the carotid baroreceptors start to stimulate your kidneys to eliminate fluid
What sense the fluid shift that occurs with bed rest
carotid barareceptors
What does the decrease in plasma volume that occurs with bed rest lead to
decrease preload, decreased end diastolic volume, decreased stroke volume, decrease CO at rest and with any activity
Bed rest also leads to ____ venous pooling in lower extremity
increased
Increase venous pooling associated with bed rest leads to…
decreased venous return -> decreased preload -> decreased CO
What is the body’s response to the changes that occur with bed rest
- Altered autonomic function, aortic baroreceptors, vascular smooth muscle
- Increase HR to compensate for decreased SV
- Increases TPR to compensate for decreased CO
What is Orthostatic hypotension
Rapid fall in blood pressure with position change. situation where there is a drop in BP as people change position due to these physiological changes.
Physiological changes with bed rest can result in _____
orthostatic hypotension
What is orthostatic hypotension primarily caused by
Venous pooling in lower extremity & delay in vasoconstriction of large blood vessels
What are the symptoms of orthostatic hypotension
Light headed
Feeling faint or fainting
How do you manage orthostatic hypotension
Change position slowly & allow time for the body responses to get used to new position
With detraining, what increases the most in 12 days
Stroke volume - due to decrease in plasma volume
what is the major goals of aerobic training
- Develop functional capacity of the central circulation
2. Enhance aerobic capacity of the specific muscles
What are the 4 general training principles
- Overload
- Specificity
- Individual differences/initial values
- Reversibility (de-training)
What is SAID principle
Specific Adaptations to Imposed Demands
What energy system is used for strength and power exercises
ATP
What energy system is used for Sustained power
ATP + PCr
