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Sunday December 21, 2014

Hormones And Exercise


Written by Greg Landry, M.S.

"Eight Hormones and Exercise"

copyright 2002 by Greg Landry, M.S.

There are many physical, mental, and physiological benefits to regular exercise. One category of benefits is the impact that exercise has on many of your body's hormones. Hormones are chemical messengers within your body that affect almost all aspects of human function:

1. Growth Hormone

- Stimulates protein synthesis (muscle tone/development), and strength of bones, tendons, ligaments, andcartilage.

- Decreases use of glucose and increases use of fat as a fuel during exercise. This helps to reduce body fat and to keep blood glucose at a normal level which helps you to exercise for a longer period of time.

Release of growth hormone from the pituitary gland in the brain is increased with increasing aerobic exercise time, especially more intense exercise such as interval training. To receive an article on intervaltraining.


2. Endorphins

- An endogenous opioid from the pituitary gland that blocks pain, decreases appetite, creates a feeling of euphoria (the exercise high), and reduces tension and anxiety. Blood levels of endorphins increase up to five times resting levels during longer duration (greater than 30 minutes) aerobic exercise at moderate to intense levels and also during interval training. Also, after several months of regular exercise, you develop an increased sensitivity to endorphins (a higher high from the same level of endorphins), and endorphins that are produced tend to stay in your blood for a longer period of time. This makes longer duration exercise easier (you're feeling no pain) and it causes your exercise high to last for a longer period of time after exercise.

3. Testosterone

- An important hormone in both males and females for maintaining muscle tone/volume/strength, increasing basal metabolic rate (metabolism), decreasing body fat, and feeling self-confident. It's produced by the ovaries in females and by the testes in males.

- Females have only about one tenth the amount of testosterone that males do, but even at that level in females it also plays a role in libido and intensity of org*sms. Production of testosterone in females begins to decline as a woman begins to approach menopause and in males it begins to decline in his forties. Blood levels of testosterone increase with exercise in both males and females beginning about 20 minutes into an exercise session, and blood levels may remain elevated for one to three hours after exercise.

4. Estrogen

- The most biologically active estrogen, 17 beta estradiol, increases fat breakdown from body fat stores so that it can be used and fuel, increases basal metabolic rate (metabolism), elevates your mood, and increases libido. This hormone is at much higher blood levels in females, but the ovaries begin to produce less of it as a woman begins to approach menopause.

The amount of 17 beta estradiol secreted by the ovaries increases with exercise, and blood levels may remain elevated for one to four hours after exercise.

5. Thyroxine (T4)

- A hormone produced by the thyroid gland, Thyroxine riases the metabolic rate ("metabolism") of almost all cells in the body. This increase in "metabolism" helps you to feel more energetic and also causes you to expend more calories, and thus is important in weight loss.

Blood levels of thyroxine increase by about 30% during exercise and remain elevated for several hours afterward - this period of time is increased by an increase in intensity and/or duration of

exercise. Regular exercise also increase thyroxine levels at rest.

6. Epinephrine

- A hormone produced primarily by the adrenal medulla that increases the amount of blood the

heart pumps and directs blood flow to where it's needed.

- Stimulates breakdown of glycogen (stored carbohydrate) in the active muscles and liver to use

as fuel. It also stimulates the breakdown of fat (in stored fat and in active muscles) to use as fuel.

The amount of epinephrine released from the adrenal medulla is proportional to the intensity and

duration of exercise.

7. Insulin (adrenaline)

- An important hormone in regulating (decreasing) blood levels of glucose ("blood sugar") and in

directing glucose, fatty acids (fat), and amino acids (protein) into the cells. Insulin secretion by

the pancreas is increased in response to a rise in blood sugar and/or amino acids (protein) as is often the case after a meal. Typically, the larger the meal, or the greater the quantity of simple sugars consumed, the larger the insulin response. An excessive insulin response causes fat production within the cells - thus, insulin is sometimes called the "fat hormone". Many overweight people's cells develop a resistance to insulin so that it takes more insulin to have the same effect. This creates a situation where blood levels of insulin are higher than normal. This condition is often

improved by losing weight and daily aerobic exercise.Blood levels of insulin begin to decrease about 10 minutes into an aerobic exercise session and continue to decrease through about 70 minutes of exercise. Regular exercise also increases a cell's sensitivity to insulin at rest.

8. Glucagon

- A hormone that is also secreted by the pancreas, but it's job is to raise blood levels of glucose

("blood sugar"). When blood sugar levels get toolow, glucagon is secreted and causes stored carbohydrate (glycogen) in the liver to be released into the blood stream to raise blood sugar to a

normal level. It also causes the breakdown of fat so that it can be used as fuel. Glucagon typically begins to be secreted beyond 30 minutes of exercise when blood glucose levels may begin to decrease. So, next time you're exercising, think about all the wonderful things that are happening to your hormones. It might even make you want to do more exercise!

Author and exercise physiologist, Greg Landry, offers

a FREE newsletter, "Healthy Weight Loss for Women",

and weight loss success stories at his site...

copyright 2002 by Greg Landry, M.S.

All Rights Reserved

Secret to Getting Ripped Fast

Comments   

 
0 #9 J 2013-01-28 05:09
I'm sure all of the above commenters were aware of the obvious typo that the author made.
Its pretty obvious that the '(adrenalin)' after #7. Insulin belonged with the adrenal discussion directly above it where 'adrenalin' should have followed epinephrine.
I love it when an intelligent commenting community is intuitive enough to be supportive of others' work.
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0 #8 Basavaraj Kabbin 2012-03-24 08:40
good informatio
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0 #7 JT 2012-03-08 20:27
What do you think M.S. stands for in this case? I can't imagine anyone that really has a M.S. in exercise or nutrition or anything biology related would think insulin=epineph rine.
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0 #6 DaniFlash 2012-01-20 14:56
Good information. Its nice to understand the function of each hormone involved during exercising.
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+1 #5 paul turner 2011-09-20 11:25
what ex physiologist thinks adrenaline and insulin are the same thing?
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+1 #4 Taito 2011-05-04 23:09
Another thing is also: "Scientifically proven" it does not state what was proven just a way to con others into thinking it's scientific and good for you =)
Like Powerade for example look at the cover next time
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+4 #3 Geoff 2010-09-03 00:22
typical shit you would read on the side of "ULTRA POWER GAINER ULTIMATE!!!" workout supplement. everything is "scientifically " designed and created to do only amazing positive things. like turn epinephrine into insulin :D

studying wikipedia doesn't make you a scientist
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0 #2 JD 2010-08-16 11:08
I was just about to say that... :D
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+9 #1 Daniela 2010-06-30 02:45
actually epinephrine is adrenaline not insulin.
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