VO2 Max

Question 0

How much of all blood cells do erythrocytes make up?

Answer 0

99%

Question 1

What are caridocytes?

Answer 1

Smaller than muscle fibres, usually one nucleus per fibre
Spontaneously contract with no nervous input
Cells connected end to end
Gap junctions allow waves of depolarisation to spread across cells
T-tubules larger than in myofibres
Sarcoplasmic reticulum smaller than that of myofibres
Mitochondria occupy 1/3 of total cell volume

Question 2

What is VO2 max?

Answer 2

Maximal volume of oxygen that can e utilised by the body in one minute (during intense exercise)
Absolute values= L.min -1
Normalised to body mass= ml.kg.min -1

Question 3

What do epidemiological studies suggest about cardio respiratory fitness and mortality?

Answer 3

At least as strong a predictor of mortality as traditional values (Steven blair)
Vo2 max is low on sedentary people and high in people whom maintain high activity levels, particularly endurance/aerobic
Association with mortality independent of age, ethnicity, adiposity, smoking status, alcohol intake and health conditions

Question 4

Fundamental questions when designing a test

Answer 4

Is it appropriate?
Hoe accurate is the test and how reliable is the data?
Why was the test terminated?
Was a truly maximal effort recorded?

Question 5

Reasons to terminate a test?

Answer 5

Subjects requests to stop
Failure of monitoring system
Vo2 max/ predetermined end point reached
Abnormal signs/ symptoms
ECG changes
Abnormal BP responses
HR response

Question 6

why are sub maximal tests useful?

Answer 6

Quick and easy. Useful in people for whom maximal exercise is not advised

Question 7

Why are submacimal tests not always an accurate estimate of VO2 max

Answer 7

Hr max and efficiency of movement cad differ between people of similar age
HR-VO2 relationship is not always linear in light and heavy intensity exercise