Had2bHarry wrote:Im not sure if its true or not, but i heard that ankle weights can damage your ankles
This is true - ankle weights can cause serious injury but this usually occurs because people use them incorrectly. Ankle weights ar supposed to be used for muscle development exercises such as leg raises, etc. - not plyometrics and agility training.
OK, sorry for going off topic from here, but many people seem confused about this genetics thing, so I will answer as simply as I can.
Have you ever wondered why there are so many long distance runners from countries such as Kenya and Ethiopia, but you never see any sprinters representing these nations?
Have you ever wondered why countries such as Jamaica and Nigeria are able to produce such fast athletes, but have zero long distance runners?
First of all, some stats:
Wetere Gelelcha - fastest man in Ethiopia - 100m time: 10:15
Tom Musinde - National 100m sprint record holder for Kenya - 100m time: 10.26 (I think it was the guy with the nike tick for his avatar who said guys at his club run a 10:30 100m. Ask them if they want to be national champion for Keyna)
Usain Bolt - 100m World record holder (therefore also fastest Jamaican 100m ever) - 100m time: 9.72
Asafa Powell - 2nd fastest Jamaican - 100m time: 9.74
Olusoji Fasuba - Previous WR holder, fastest man in Nigeria - 100m time: 9.85
How is it that the difference between the fastest man in Jamaica and the fastest man in Kenya is a STAGGERING 0.54 seconds?!?!?
Maybe the Kenyans just dont like sprinting?
Now, in all seriousness, has anyone ever heard of muscle fibres?
For the truants, special people, and those without attention spans, read the following:
http://www.isokinetics.net/advanced/mus ... rtypes.htm
Now, a summary for those who cant read white text.
Skeletal muscle fibres are not all the same. The most basic categorisation of these muscle fibres is by colour - the red muscle fibres and the white muscle fibres.
They can be categorised further (into type I, IIa, IIb), but this is not necessary at this point.
Now, you may have heard of fast and slow twitch muscle fibres before, but what exactly are they and what do they do?
The red muscle fibres are known as slow twitch muscle fibres. These muscle fibres contain:
- Large amounts of myoglobin
- Many mitochondria
- Many blood capillaries
- Generate ATP by the aerobic system, hence the term oxidative fibers
- Split ATP at a slow rate
- ... and are resistant to fatigue
If you aspire to be a long distance athlete, these are the muscle fibres you want.
The white muscle fibres are known as fast twitch muscle fibres. These muscle fibres contain:
- Low myoglobin content
- Few mitochondria
- Few blood capillaries
- Large amount of glycogen
- Split ATP very quickly
- ... and fatigue easily
If your dream is to become an olympic sprinter, these are the muscle fibres for you.
Now you may be asking youself, what does this mean?
This means that a percentage of your muscle fibres are white and the rest are red. Lets look at an example.
Ken is a Kenyan. He has 70% red muscle fibres and 30% white muscle fibres.
Jay is a Jamaican. He has 70% white muscle fibres, and 30% red muscle fibres.
These guys decide to have a race. The winner of the race will be King of the World. The loser will not. Ken suggests that they run 10 laps of the oval which, for some reason, equals out to 4000m.
Any idea why?
But Jay wants to be King of the World. He says that they should have another race, but this time, it will be a sprint. They measure out 100m and then sprint.
Ken demands a rematch.
Jay wins again.
Now, I am not saying that any Jamaican sprinter will beat any Kenyan "sprinter", and that any Kenyan runner will beat any Jamaican "runner". I am saying that as a collective group, Jamaicans can sprint faster than the Kenyays, and the Kenyays can out-marathon the Jamaicans.
You may now be wondering why is it that most Kenyans have a greater percentage of red muscle fibres, and most jamaicans have a greater percentage of white muscle fibres.
The answer is simple
The genes of an individual determine the white:red muscle fibre percentage of that individual.
Olympic sprinters have a white muscle fibre percentage of about 80. That's right, 80%. Those who excel in the long distance events, however, have the opposite (aproximately 80% red muscle fibres)
The genetic component of muscle fiber type can not be overlooked when it comes to athletic ability and performance. The fact is that if you are born with a greater percentage of white muscle fibres, you will be a better sprinter that someone who is identical to you in every way, except that they have a greater percentage of red muscle fibres.
Although olympic athletes are blessed with this genetic advantage, athletes are made, not born. These olympians, and just about all athletes have dedicated their lives to their chosen sport(s) and train evry single day.
If you are the offspring of the fastest man and woman (over 100m) in Jamaica, there is no gaurantee that you will be an Olympic athlete, or even any sort of athlete. The fact is, however, you will have a much greater chance at becoming a world champion sprinter than the offspring of the fastest man and woman (over 41km) in Kenya.
This example of muscle fibres is only one example of the many different inherited traits which can help one excel at sport. I hope this has cleared a few things up, and if anyone has any disagreement with anything I've written then please correct me. After all, we're all still learning.
Also, did you know, Lance Armstrongs resting heart rate is 28?
EDIT: fk i should have saved this for my 50th post.