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Physiology & Medicine / Re: Cholestrol in eggs

« on: 26/05/2005 07:03:13 »

the amount of cholestrol in the diet does not effect blood cholestrol ?? I might be wrong but that goes against everything i was taught when i studyed nutrition. As far as i know there are two types of cholestrol HDL (the good) and LDL (the bad. If anyone is intrested there is a link here that explains things in nice simple terms http://www.liferesearchuniversal.com/fat.html As for eggs i was under the impression that recent evidence had shown that the LDL in eggs was counteracted by the HDL, has anyone else heard of this ?

http://profiles.yahoo.com/chris_englishgent

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Physiology & Medicine / Re: Trying to lose weight: how do I stop feeling hungry all the time?

« on: 17/05/2005 01:07:35 »

if i was you i would just increase the number of meals you have in a day. When you only eat three times per day you are very very hungry when it comes to meal time so you tend to eat more than your body needs too. It takes a while for the signal to get from your stomach to your brain to say you are full. If you start eating around 6 small meals per day then when it comes to meal times you wont be as hungry and wont over eat.
Obviously i dont know your body weight/fat percentage or activity level so i cant give you a guideline to how many callories you need each day. Concentrate on low fat meats, food low in saturated fats and sugars, and carbohydrates that are low on the G.I. and lots and lots of veg. Increase the amount of water you drink per day as people often confuse thirst with hunger.
Taking something like zetacap is like using a cement as tooth filler its a little excesive IMO, do it the old fashioned way it will benefit you a lot more in the long term

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Physiology & Medicine / Re: mulitjoint muscle fibres

« on: 14/05/2005 07:38:31 »

No nice idea but no muscle contraction is needed to keep the knee in a flexed position because gravity does that for us. I always stand up and do the movements too lol ha ha ha. When i was in one of my exams i could see people twitching in their seats wanting to get up lol.

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Physiology & Medicine / mulitjoint muscle fibres

« on: 13/05/2005 19:04:00 »

The rectus femoris is the only quadricep muscle that crosses two joints. It is responsible for flexion on the hip and extension of the knee. How is it possible for me to flex my hip using the rectus femoris without extending my knee as all muscle fibres stretch the entire length of the muscle and contract across its whole length or not at all?
          I understand that the hip flexor muscles are also working during flexion of the hip but the rectus femoris is also working so how is this possible.
          I have been puzzeled by this for a while now and have also had difficluty getting a definitive explaination for 'Lomards parodox'. Can anyone shed any light on this for me ?

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Physiology & Medicine / Re: Pubes

« on: 12/05/2005 13:56:54 »

this is only a guess but maybe the reason we have arm pit hair is to soak up sweat to reduce the posibility of infection. The armpit is a bit of a sweat trap isnt it. But then again i do know of people who have developed skin infections under their arm from using anti persperant, the pores are blocked they didnt shower enough and the skin started to blister.

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Physiology & Medicine / Nutrition books

« on: 07/05/2005 16:18:41 »

i was wondering if any of you knowledgeable people could recomend me some decent books on nutrition. I alrady have Exercise Physiology: Energy, Nutrition, and Human Performance by William D. McArdle, Frank I. Katch, Victor L. Katch. But was wondering if anyone knew of any others at this level or above that are worth a read. I am perticually interested in sports nutrition. Anybody got any recomendations ? Thanks in advance

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Physiology & Medicine / Re: Drinking cold water helps slimming.

« on: 06/03/2005 21:46:22 »

Yes it does work i knew a guy who tried it. Your body burns callories to raise the heat of the water up to body temperature. The guy i know who did this just drank lots of water with ice in it all day and lost around 2 stone in about 3 months. He looked absolutly terrible almost skeletal in his face. This method will make you lose weight but the question is at what cost? I think this has to be a very dangerous diet as drinking freezing cold water all day is deffinatly going to have an effect on your internal organs, basically its going chil them

8

Physiology & Medicine / What are the different types of muscle fibres ?

« on: 27/02/2005 16:38:18 »

I was wondering if someone could give me somemore information about muscle fibre types. Until recently i was under the impression that there were only 3 fibre types, type 1 type 2A & type 2B. I have since found that there are others but i am finding it difficult to find out much information about them

Type 1 (slow oxidative) Red fibres containing lots of myoglobin & mitocondria, a good blood supply are very fatigue resistant

Type 2 a (fast oxidative glycolytic) pink fibres containing myoglobin & mitocondria, a good blood supply and are fairly fatigue resistant often brought into use when reaching around 80-90% of M.H.R (or the point at which type 1 fibres cant cope) to aid Type 1 fibres or brought into use to aid type 2 b fibres when they cant cope with the resistance alone.

Type 2b (fast glycolytic) white fibres containing less myoglobin & mitocondria have a redused blood supply and fatigue quickly

Type 2C are more oxidative than 2A or 2B (humans only have around 0.5%, birds have a much higher %) yet are more fatigueable and have more anerobic properties, suposivly used to assist type 2b (weird since they are more oxidative???)

Type 2AB are an intermediate fibre (does this mean they can permantently change into another type ? are they growing fibres? or are they similar in charteristics to 2A?)

After searching the internet for a couple of hours this is all the information i have been able to dig out, with some sources contradicting each others. If anyone can provide any more information or correct any mistakes i have made in the above please do so as i find this very interesting and want to get to the bottom of it.

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Physiology & Medicine / Re: eye lids ???

« on: 14/01/2005 19:31:14 »

Yes thats great i've been wondering about it for ages thanks a lot mate

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Physiology & Medicine / eye lids ???

« on: 08/01/2005 19:27:22 »

As i understand it we have three types of muscle in our body, cardic, skeletal (voluntary), viseral (involuntary).
I was wondering which type of muscle controls the eye lids becuase the movement there can be voluntary or involuntary? Also are the muscles that control the movement striated ?

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Cells, Microbes & Viruses / Re: What happens to the phosphate from ATP in cells

« on: 28/11/2004 16:58:29 »

Thats great man thanks very much you are the only person who has been able to give me a satisfactory answer

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Cells, Microbes & Viruses / What happens to the phosphate from ATP in cells

« on: 27/11/2004 01:12:14 »

Just wondered if anyone can help me with this hope is not a little to basic for this forum. After ATP releases one of its phosphate atoms and becomes ADP what happens to the phosphate atom that was released ? Obviouslys ADP is turned back into ATP by utilising the phosphate atom from creatine phosphate but this still leaves us a spare phosphate atom floating about ?? what happend to this? Can anyone help me with this?