What do you make of this?
(click to enlarge)
Interpret a piece of this and write a comment by Tuesday 11:59pm to receive extra credit
(Source: Doug Bush, EnduranceFactor.com)
(click to enlarge)
Interpret a piece of this and write a comment by Tuesday 11:59pm to receive extra credit
(Source: Doug Bush, EnduranceFactor.com)
6 comments:
My comments and thoughts on this graph include:
- Zone 2 is where the athlete used the most sources of energy probably because he/she was in Zone 2 for the longest time. According to the Calorie Utilization chart the total for Zone 2 is 16.6. Zone 1 is where he/she used the most fat (4.5).
- The athlete’s Lactate Threshold is at 164 BPM (between Zones 4 and 5). This means that his/her lactic acid removal failed to keep up with his/her rate of lactate production at this time.
- The Graph shows that when the black line (the fat utilization line) is at zero, the athlete was not using anymore fat. This is because his/her heart rate increased which means, he/she was running at a faster speed. (The athlete’s heart rate range at the time where there was no fat utilization is 158 to 165 BPM) In this case he/she wouldn’t be using Free Fatty acids. Free fatty acids are used at the Krebs cycle (oxidative metabolism) when an athlete is running at a steady pace for a long time. At Zone 4 and 5 the athlete’s heart rate increased because he/she was running faster. I think the athlete’s body went back to glycolysis because glycolysis (non-oxidative metabolism) is used when one is running at a fast pace (sprinting or close to it). This means that the athlete’s body is using glucose at this time.
The graph shows that the athlete is in zone two for the longest time because that is their average heart rate and it is the comfortable pace for an athlete. Therefore, the athlete is using a lot of fat to stay in this zone because they are in there for a longer period of time and they're going at a pace where you only use fat. This person's latic threshold is 164 and when they are near the threshold, they are not using as much fat for their energy because they have been going for a longer period of time and their workout is getting more intense so they are using the nonoxidative metabolism istead. When your heart rate is increasing, you use less fat but in order to reach this heart rate, your body uses a lot of fat to keep going and to have energy.
According to the graph the fat utilization decreases from zone 1-5 (zone 1 = 4.6, 2 = 4.3, 3 = 2.6, 4 = .2, 5 = 0). This, in my opinion is because during a run the body is most likely going throught oxidative metablolism and using free fatty acids to produce energy (ATP). When a run is nearing the end most runners tend to speed up, so if this athlete was sprinting at the end of the run (end of zone 4 and begining of zone 5), then the body would switch to non-oxidative metabolism (glucose and a series of reactions involving many enzymes would be used to produce ATP). It would switch to non-oxidative metabolism because the body would not be recieving enough oxygen to go through the kreb's cycle (oxidative) and it would have to find another way to produce its needed energy.
The AT or Lactic Threshold(when the lactate removial does not keep up with lactate production) is at 164, this is where the athlete would be nearing the end of an tough workout. The athlete would also be near his/her VO2 max at this point.
Calorie utilization includes the usage of energy from a variety of food sources, such as glucose, free fatty acids, etc. In this chart, the highest fat utilization occurs at zone 2. This means that this person might ingest lipids so that free fatty acids can be used in the krebs cycle (oxidative metabolism) for ATP production. A lipid molecule has the most energy per molecule, so it would be a good idea to have free fatty acids being used to produce ATP. However, after zone 2, fat utilization decreases. This may occur because the body may be low on free fatty acids (as in zones 4 and 5). Since zone 2 uses the most, the other zones have lesser amounts of fat to use. However, as mentioned, the body has other food sources for ATP production (maybe glucose), so the calorie utilization increases.
The anaerobic threshold, or lactic threshold, occurs at 164 bpm. Lactic threshold is the point when the rate of lactic acid removal is lower than the rate of lactic production. It is at this point when a person goes through blood acidosis and begins to faint. This also indicates that the person is reaching his / her VO2 max, which is the maximum amount of oxygen consumption.
In zones 1 and 2 is where the athlete was utilizing the most of their fat (zone 1 = 4.6(Kcal/Min) zone 2 = 4.3(Kcal/Min)) This is mostly because in these zones the body was going through oxidative metabolism in particular the Krebs cycle where fat is needed to produce ATP to give the body the adequate amount of energy it needed. At 148 bpm the athlete-entered zone 3 and the fat utilization dropped to 2.6(Kcal/Min), this is where the athlete started to pick up their pase. As the athlete hart rate was 156 bpm they exited zone 3 and entered zone 4 where the fat utilization was only 0.2(Kcal/Min). This is where the athlete was running at a very fast pase and non-oxidative metabolism is starting to kick in. The body will switch to non-oxidative metabolism because the body will not be receiving enough oxygen to perform under oxidative metabolism. At 164 bpm between zones 4 and 5 the athlete will reach his lactic threshold (AT) this is where lactic production fails to keep up with lactic removal. The athlete will start to feel a burn in their legs. The athlete body will be using non-oxidative metabolism and the athlete is approaching their VO2 max.
I don't get it
Post a Comment