Oxygen delivery: LIP

Question 1

LIP full form

Answer 1

Lactate inflection point

Question 2

the LIP shows

Answer 2

the exercise intensity beyond which a given exercise intensity or power output cannot be maintained.
- exercise intensities beyond the LIP are associated with a shortened time to fatigue-> the higher the exercise intensity beyond the LIP, the faster the onset to fatigue

Question 3

Other ways to say LIP

Answer 3

Onset of blood lactate accumulation (OBLA), lactate threshold, anaerobic threshold

Question 4

EPOC

Answer 4

Excess post-exercise oxygen consumption

Answer 5

accumulated so much that power output cannot be maintained- drops back down quickly

Question 6

LIP represents

Answer 6

the highest steady-state exercise intensity an individual can perform for a longer duration

Question 7

An individual’s LIP value will vary depending on:

Answer 7

the person’s fitness
environmental conditions
nutritional status
genetics
type of training
intensity of exercise

Question 8

is vo2 or LIP a better indicator of performance?

Answer 8

LIP is a much better indicator of performance in endurance activities
- much more highly trainable
- indicates the threshold at which lactate production exceeds clearance
- correlatesmore closely with actual performance by showing an athlete’s ability to sustain performance without accumulating excess lactate

Question 9

Range of LIP for untrained athlete

Answer 9

• 55-70% of MHR, with an average value of around 60%
• 40-70% of VO2 max, average around 50-60% of VO2 max

Question 10

why is it important to determine the LIP of an athlete?

Answer 10

to determine if atheletes are at their max performance (if in steady state, need to increase performance
- cannot use training for untrained athletes for trained athletes-> won’t reach anywhere close the LIP of trained athlete (lactate isn’t even used yet)

Question 11

Range of LIP for trained athlete

Answer 11

• up to or in excess of 90% MHR
• 70-95% of VO2 max, though usually in the range of 70-80% VO2 max

Question 12

How can a person’s lactate inflection point be improved?

Answer 12

through training, working at or just over the intensity needed to reach your lip, at a point where the body should be dumping lactic acid
-> through intermittent training or continuous training

Question 13

what happens when there are loads of h+, how does it impact loads of lactic acid

Answer 13

excess h+ is removed by combining with bicarbonate ions to raise the pH
- reduce lactic acid very rapidly

Question 14

what to do when h+ in the blood are low

Answer 14

carbonic acid releases H+ to lower the pH

Question 15

briefly describe what buffering is.

Answer 15

• excess hydrogen ions are removed from the body
• via processes like the carbonic acid buffering system
• to enable the body to continue working for longer periods without the burn/ heaviness associated with decreasing pH levels generated through high intensity exercise.
• organs like the lungs also participate in buffering by removing co2, kidneys excrete h+ in urine
• buffering has to happen

Question 16

what is the generally accepted blood lactate value that the LIP will occur at?

Answer 16

4mM (millimoles)

Question 17

What aspects can impact the relationship between a trained athlete with a higher LIP and rate of fatigue?

Answer 17

psychology and skill acquisition