Factors affecting VO2 Max/Aerobic Power Flashcards
1
Q
Physiological factors affecting ability to use O2
A
- Cardiac output
- SV/ejection fraction+hypertrophy
- HR range
- O2 being used for heart
- Level of haemaglobin
- Glycogen/triglyceride stores
- Myoglobin content
- Capillirisation around the muscles
- Number and size of mitochondria
- Surface area of alveoli
- Lactate tolerance
2
Q
Training factors that affect ability to use O2
A
- VO2 max can be improved by up to 10/20% following a period of aerobic training
3
Q
Genetic factors that affect ability to use O2
A
- Inherited factors of physiology limit possible improvement
4
Q
Age factors that affect ability to use O2
A
- Older you are, the lower your VO2 max
5
Q
Gender factors that affect ability to use O2
A
- Men generally have approx 20% higher VO2 max
6
Q
Body composition factors that affect ability to use O2
A
- Higher % of body fat decreases VO2 max
7
Q
Lifestyle factors that affect ability to use O2
A
- Smoking/sedentary lifestyle, poor diet/fitness can reduce VO2 max values
8
Q
What are the 4 ways of measuring energy expenditure?
A
- Lactate sampling
- VO2 max tests
- RER
- Indirect calorimetry
9
Q
Lactate sampling
A
- Taking blood samples - venous extraction using needle
- Measures lactate in bloodstream - mmol/L
- Provides accurate/objective measure
- Measures OBLA/lactate threshold - occurs at 4mmol/L
- Testing is done during training
- Ensures training is correct intensity/monitors improvements over time
- Endurance athletes will use it to establish their OBLA point - would dictate speed of training
10
Q
Advantages of lactate sampling
A
- portable handheld device = easy to use
- immediate results
- would use to inform training intensities as they try to improve buffering system/tolerance to lactic acid
11
Q
Disadvantages of lactate sampling
A
- must be done regularly
- can be painful
12
Q
VO2 Max Testing
A
- Progressive test carried out on treadmill
- Used to calc max volume of O2 that can be consumed per unit of time
- Measured in L/Min
- Involves use of gas analysis
- Endurance athletes may rely on it as a physiological measure to inform training
- They may integrate VO2 max testing regularly within training schedule
- More likely to make use of it bc of aerobic evaluation it allows
13
Q
Advantages of VO2 Mex testing
A
- Can plan training programme to increase it - bleep test/coopers run which is easily done, athletes just have to be motivated
14
Q
Disadvantages of VO2 Max testing
A
- Can lead to exhaustion - difficult/unreliable
- Gas analysis requires equipment and data collection - may be difficult to access
15
Q
Respiratory exchange ratio
A
- Physiological parameter that represents ratio of CO2 production to O2 consumption during metabolism
- Provides insight to substrate utilisation during metabolism, indicating whether body is mainly using carbs/fats or mix
- RER ranges from 0.7 to 1.0
- 1.0 = carbs main fuel, below 1.0 = fats main fuel
- 0.7-1.0 = mix of both
- Substrate switching: increased intensity = switch from fat to carbs metabolism
- It’s a valuable tool to monitor how body substrate utilisations changes w/ difference intensities
