how many times does the muscles of the heart contract a day?
343131
It depends how fast your heart beats, in an average healthy adult it's approximately 100,000 times a day, roughly 70 times a minute.
495569
id say at least once a day. It only lasts a few seconds but its worth it allways.
597315
Once every 2 years. Just kidding, I don't know...once a day is good.
288793
Muscles need a 24 hour rest period, so every other day is ideal. When you work your muscles you actually cause tiny tears in the muscle fibers and these need time to repair and strengthen. Work upper body one day and lower body the next day.
814503
Flexibility, cardiovascular endurance, muscular strength, muscular endurance and body composition. Flexibility-reaching and moving about daily, cardiovascular-depends on your job, but walking three times a day for short walks of 10 min. will work. Muscular strength-lifting heavy objects during the day. Muscular endurance-repetitive lifting of objects. Body composition-smart choices in healthy eating.
782816
at the VERY least once a day.
595108
what are you asking?  The heart is a muscle
1122808
It happens everyday.\nLOL
684485
It beats around 100,000 times per day, pumping 5.5 litres of blood through 150,000km of blood vessels three times every minute. During an average life span, the heart will beat 2.5bn times.
396031
As the heart increase in size, the surface area increase by the square, while the internal volume increases by the cube.\nExample: internal volume = Length * Width * height\n\nAs the internal volume increases the amount of blood pumped per heart beat (stroke volume) increases.\n\nThe actual “strength” of the heart is unchanged. Cardiac myosites are essentially unchanged between different mammal species. \n\nWell trained athletes tend to have a health heart hypertrophy (enlarged heart) and have heart beats in the 40’s-50’s BPM while the average adults range in the 60’s-80’s.\n\nAs an end product of all of this, large animals tend to have slower metabolic rates because while it may be possible for a 6 oz bird to eat its weight in insects a day a large animal like a dog can not be expected to do so.
495626
The recommended amount to ensure a healthy heart and body is to take 30 minutes of moderate exercise 4 to 7 days a week. As long as the exercise raises your heart rate, makes you sweat and doesn't prevent you from being able to conduct a slightly out of breath conversation (if you can't talk, it's too much) it doesn't matter what it is - it could be ballroom dancing, walking, gardening, running, swimming - anything.  Don't forget that resting is also necessary as exercise "breaks" muscle fibres which then "heal" to form stronger, thicker muscles (this is normal).  Resting allows the body to heal itself.
178686
every day if possible..at least 3 times a week..or more than one time a day.
150268
very normal. There is no limit to really how many times you can do it a day. but if it hurts or you become obseesed about doing it, stop and see a doctor, or just stop doing it. lots of mental power.
19912
The entire heart is a pump. The whole thing contracts and expands 72 times a minute on average.  What is it's source of energy? Same thing as every other organ's source of energy. . .the food you eat, with the help of oxygen, food broken down into its constituent parts is what fuels the body.
1133196
i do it at least once a day..... up to 3 on a good day.....but it is all natural......feel good about doin it! i know i do!
1098733
The average human heart beats approximately two billion times in a lifetime.
466210
Since the solar year consists of 525,948 minutes and 48 seconds, a quick calculation at the rate of 80 BPM gives us a ballpark figure of 42,075,904 beats per year, give or take a couple mill. A reasonable estimate for the number of heartbeats in a lifetime is about three billion.\n\nhttp://www.straightdope.com/classics/a1_088a.html