Sunday, August 31, 2014
HUMAN HEART - FACTS
☛ 1. Every day, your heart beats about 100,000
times, sending 2,000 gallons of blood surging through your body. Although it’s
no bigger than your fist, your heart has the mighty job of keeping blood
flowing through the 60,000 miles of blood vessels that feed your organs and
tissues. Any damage to the heart or its valves can reduce that pumping power,
forcing the heart to work harder just to keep up with the body’s demand for
blood.
So how do you make sure your heart is in tip-top shape?
Eat healthy, well-balanced meals and don’t skimp on the exercise.
☛ 2. When it comes to matters of the heart, men and women definitely aren’t created equal. For instance, a man’s heart weighs about 10 ounces, while a woman’s heart weighs approximately 8 ounces.
Not only is a woman’s heart smaller than a man’s, but the signs that it’s in trouble are a lot less obvious. When women have a heart attack (and more than a half million do each year) they’re more likely to have nausea, indigestion, and shoulder aches rather than the hallmark chest pain.
Heart disease is the biggest killer of both men and women. And both genders should heed this healthy advice: Don’t smoke, keep your blood pressure and cholesterol levels in check, and watch for the obvious and the more subtle warning signs your heart could be in trouble.
☛ 3. Laughter: The good heart medicine
Health experts now have proof that laughter is good medicine.
A good belly laugh can send 20% more blood flowing through your entire body. One study found that when people watched a funny movie, their blood flow increased. That’s why laughter might just be the perfect antidote to stress.
When you laugh, the lining of your blood vessel walls relaxes and expands. So have a good giggle. Your heart will thank you.
☛ 4. Stress and the Monday morning heart attack
You’re more likely to have a heart attack on Monday morning than at any other time of the week.
Doctors have long known that morning is prime time for heart attacks. "We call it 'the witching hour". That's because levels of a stress hormone called cortisol peak early in the day. When this happens, cholesterol plaque that has built up in the arteries can rupture and block the flow of blood to the heart. Add in the rise in blood pressure and increased heart rate from the stress of returning to work after the weekend, and you have the perfect recipe for a Monday morning heart attack.
That’s why it’s important to reduce your stress levels as much as you can. Practice yoga, meditate, exercise, laugh, or spend more quality time with your family - whatever works best for you.
☛ 5. How sex helps the heart
Having an active sex life could cut a man’s risk of dying from heart disease in half. For men, having an orgasm three or four times a week might offer potent protection against a heart attack or stroke, according to one British study.
Whether sex works as well for women’s hearts is unclear, but a healthy love life seems to equate to good overall health. For one thing, sexual activity is an excellent stress buster. It’s also great exercise - burning about 85 calories per half-hour session.
If you find it difficult to have sex, that could be a big red flag that something is wrong with your heart. For example, some researchers think erectile dysfunction might warn of a heart attack up to five years in advance.
Sources:
Richard Krasuski, MD, director of Adult Congenital Heart Disease Services; staff cardiologist, Section of Clinical Cardiology, Cleveland Clinic.
Cleveland Clinic: “Heart Facts.”
National Center for Health Statistics: "Deaths-Leading Causes."
American Heart Association: "Women and Cardiovascular Diseases – Statistics 2009."
Women’s Heart Foundation: "What is a Heart Attack?"
University of Maryland Medical Center: “University of Maryland School of Medicine Study Shows Laughter Helps Blood Vessels Function Better."
Ebrahim, S. Journal of Epidemiology and Community Health, February 2002; vol 56: pp 99-102.
WebMD Feature: "10 Surprising Health Benefits of Sex."
WebMD Health News: “Younger Women Miss Heart Attack Signs.”
Image via info-medicos
So how do you make sure your heart is in tip-top shape?
Eat healthy, well-balanced meals and don’t skimp on the exercise.
☛ 2. When it comes to matters of the heart, men and women definitely aren’t created equal. For instance, a man’s heart weighs about 10 ounces, while a woman’s heart weighs approximately 8 ounces.
Not only is a woman’s heart smaller than a man’s, but the signs that it’s in trouble are a lot less obvious. When women have a heart attack (and more than a half million do each year) they’re more likely to have nausea, indigestion, and shoulder aches rather than the hallmark chest pain.
Heart disease is the biggest killer of both men and women. And both genders should heed this healthy advice: Don’t smoke, keep your blood pressure and cholesterol levels in check, and watch for the obvious and the more subtle warning signs your heart could be in trouble.
☛ 3. Laughter: The good heart medicine
Health experts now have proof that laughter is good medicine.
A good belly laugh can send 20% more blood flowing through your entire body. One study found that when people watched a funny movie, their blood flow increased. That’s why laughter might just be the perfect antidote to stress.
When you laugh, the lining of your blood vessel walls relaxes and expands. So have a good giggle. Your heart will thank you.
☛ 4. Stress and the Monday morning heart attack
You’re more likely to have a heart attack on Monday morning than at any other time of the week.
Doctors have long known that morning is prime time for heart attacks. "We call it 'the witching hour". That's because levels of a stress hormone called cortisol peak early in the day. When this happens, cholesterol plaque that has built up in the arteries can rupture and block the flow of blood to the heart. Add in the rise in blood pressure and increased heart rate from the stress of returning to work after the weekend, and you have the perfect recipe for a Monday morning heart attack.
That’s why it’s important to reduce your stress levels as much as you can. Practice yoga, meditate, exercise, laugh, or spend more quality time with your family - whatever works best for you.
☛ 5. How sex helps the heart
Having an active sex life could cut a man’s risk of dying from heart disease in half. For men, having an orgasm three or four times a week might offer potent protection against a heart attack or stroke, according to one British study.
Whether sex works as well for women’s hearts is unclear, but a healthy love life seems to equate to good overall health. For one thing, sexual activity is an excellent stress buster. It’s also great exercise - burning about 85 calories per half-hour session.
If you find it difficult to have sex, that could be a big red flag that something is wrong with your heart. For example, some researchers think erectile dysfunction might warn of a heart attack up to five years in advance.
Sources:
Richard Krasuski, MD, director of Adult Congenital Heart Disease Services; staff cardiologist, Section of Clinical Cardiology, Cleveland Clinic.
Cleveland Clinic: “Heart Facts.”
National Center for Health Statistics: "Deaths-Leading Causes."
American Heart Association: "Women and Cardiovascular Diseases – Statistics 2009."
Women’s Heart Foundation: "What is a Heart Attack?"
University of Maryland Medical Center: “University of Maryland School of Medicine Study Shows Laughter Helps Blood Vessels Function Better."
Ebrahim, S. Journal of Epidemiology and Community Health, February 2002; vol 56: pp 99-102.
WebMD Feature: "10 Surprising Health Benefits of Sex."
WebMD Health News: “Younger Women Miss Heart Attack Signs.”
Image via info-medicos
corina marinescu
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Saturday, August 30, 2014
THERMAL RECORDING OF THE ALS ICE BUCKET CHALLENGE
ALS was first found in 1869
by French neurologist Jean-Martin Charcot, but it wasn’t until 1939 that Lou
Gehrig brought national and international attention to the disease. Ending the
career of one of the most beloved baseball players of all time, the disease is
still most closely associated with his name. Amyotrophic lateral sclerosis
(ALS) is a progressive neurodegenerative disease that affects nerve cells in
the brain and the spinal cord. Motor neurons reach from the brain to the spinal
cord and from the spinal cord to the muscles throughout the body. The
progressive degeneration of the motor neurons in ALS eventually leads to their
death. When the motor neurons die, the ability of the brain to initiate
and control muscle movement is lost. With voluntary muscle action progressively
affected, patients in the later stages of the disease may become totally
paralyzed.
More about ALS:
http://www.alsa.org/fight-als/ice-bucket-challenge.html
Image via imgur
More about ALS:
http://www.alsa.org/fight-als/ice-bucket-challenge.html
Image via imgur
Corina Marinescu
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Friday, August 29, 2014
SUPERSONIC SUBMARINE MIGHT TRAVEL SHANGHAI-SAN FRANCISCO IN 100 MINUTES
Chinese scientists are very close to creating
a supersonic submarine capable of traveling from Shanghai to San Francisco in
less than two hours. Researchers found a way to generate a huge air bubble
around the submarine reducing drastically the water friction and therefore
augmenting its speed.
This technique is called supercavitation and was developed originally by Soviet military during the Cold War. They built a supersonic torpedo called Shakval that was able to reach 230 mph (370 kmh)—In theory, a supercavitating vessel could reach the speed of sound underwater, or about 3603 mph (5,800km/h.) Chinese researchers solved some of the problems Russian faced with Shakval but not all of them. South China Morning Post writes: Professor Wang Guoyu, head of the Fluid Mechanics Laboratory at Beijing Institute of Technology who is leading another state-funded research project on supercavitation, said the global research community had been troubled for decades by the lack of innovative ideas to address the huge scientific and engineering challenges. "The size of the bubble is difficult to control, and the vessel is almost impossible to steer," he said. While cruising at high speed during supercavitation, a fin could be snapped off if it touched the water because of the liquid's far greater density.
South China Morning Post: http://www.scmp.com/news/china/article/1580226/shanghai-san-francisco-100-minutes-chinese-supersonic-submarine
gif below: Cavitation occurring at the bottom of a glass bottle
This technique is called supercavitation and was developed originally by Soviet military during the Cold War. They built a supersonic torpedo called Shakval that was able to reach 230 mph (370 kmh)—In theory, a supercavitating vessel could reach the speed of sound underwater, or about 3603 mph (5,800km/h.) Chinese researchers solved some of the problems Russian faced with Shakval but not all of them. South China Morning Post writes: Professor Wang Guoyu, head of the Fluid Mechanics Laboratory at Beijing Institute of Technology who is leading another state-funded research project on supercavitation, said the global research community had been troubled for decades by the lack of innovative ideas to address the huge scientific and engineering challenges. "The size of the bubble is difficult to control, and the vessel is almost impossible to steer," he said. While cruising at high speed during supercavitation, a fin could be snapped off if it touched the water because of the liquid's far greater density.
South China Morning Post: http://www.scmp.com/news/china/article/1580226/shanghai-san-francisco-100-minutes-chinese-supersonic-submarine
gif below: Cavitation occurring at the bottom of a glass bottle
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