It all started back in the 1960s, when Bela Julesz, who worked at (AT&T) Bell Labs researching human vision-particularly depth perception and pattern recognition-created the random-dot stereogram (RDS). 41.1 What Is a Stereogram?Ī stereogram is a 2D image that encodes stereo information so that, when viewed correctly, it reveals a hidden 3D scene. The CD content, including demos and content, is available on the web and for download. You can purchase a beautifully printed version of this book, and others in the series, at a 30% discount courtesy of InformIT and Addison-Wesley. To gauge your maximum heart rate, take your pulse immediately after exercising as vigorously as possible.GPU Gems GPU Gems is now available, right here, online. The best time to get your resting heart rate is first thing in the morning, even before you get out of bed. You can probably get a pretty accurate reading by counting the number of beats in 15 seconds and multiplying that number by four. If you press too hard you may suppress the pulse. Feel around lightly until you detect throbbing. Press your index and middle fingers together on your wrist, below the fat pad of your thumb.
SIRDS IMAGES HOW TO
How to take your pulseĪlthough you may be able to feel your blood pumping in a number of places-your neck, the inside of your elbow, and even the top of your foot-your wrist is probably the most convenient and reliable place to get a good pulse. Your doctor can help you set realistic goals. Some medications-particularly beta blockers-can lower your heart rate. However, if you don't exercise regularly, you should check with your doctor before you set a target heart rate. If you're starting an exercise program, you may want to set your target rate at 50% of maximum and gradually increase the intensity of your workout until you reach 70% to 80%. Because it's impossible to maintain a maximum heart rate for more than a few minutes, physiologists have advised setting a percentage of your maximum heart rate as a target during exercise. Vigorous exercise is the best way to both lower your resting heart rate and increase your maximum heart rate and aerobic capacity.
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And a small controlled trial demonstrated that men and women with mild cognitive impairment who raised their aerobic capacity also improved their performance on tests of memory and reasoning. Several large observational studies have indicated that a high aerobic capacity is associated with a lower risk of heart attack and death. Your maximum heart rate plays a major role in setting your aerobic capacity-the amount of oxygen you are able to consume. The rate at which your heart is beating when it is working its hardest to meet your body's oxygen needs is your maximum heart rate. If your resting heart rate is consistently above 80 beats per minute, you might want to talk to your doctor about how your heart rate and other personal factors influence your risk for cardiovascular disease. When WHI researchers examined data on 129,135 postmenopausal women, they found that those with the highest resting heart rates-more than 76 beats per minute-were 26% more likely to have a heart attack or die from one than those with the lowest resting heart rates-62 beats per minute or less. However, a 2010 report from the Women's Health Initiative (WHI) indicated that a resting heart rate at the low end of that spectrum may offer some protection against heart attacks. For most healthy adult women and men, resting heart rates range from 60 to 100 beats per minute. When you are at rest, your heart is pumping the lowest amount of blood to supply the oxygen your body's needs. It's a good idea to take your pulse occasionally to get a sense of what's normal for you and to identify unusual changes in rate or regularity that may warrant medical attention. It's a fairly easy to do and having the information can help down the road. One simple thing people can do is to check their resting heart rate. However, an unusually high resting heart rate or low maximum heart rate may signify an increased risk of heart attack and death. What is a "normal" heart rate varies from person to person.
It speeds up and slows down to accommodate your changing need for oxygen as your activities vary throughout the day. A healthy heart doesn't beat with the regularity of clockwork. Your grandmother may have referred to your heart as "your ticker," but that nickname has proved to be a misnomer. Your pulse, both at rest and during exercise, can reveal your risk for heart attack and your aerobic capacity.
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