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Study Suggests The Importance Of Maintaining A Low Resting Heart Rate

When you sit quietly, your heart slips into the slower, steady pace known as your resting heart rate. A new study suggests that an increase in this rate over time may be a signal of heart trouble ahead.

Your heart rate changes from minute to minute. It depends on whether you are standing up or lying down, moving around or sitting still, stressed or relaxed. Your resting heart rate, though, tends to be stable from day to day. The usual range for resting heart rate is anywhere between 60 and 90 beats per minute. Above 90 is considered high.

Many factors influence resting heart rate. Genes play a role. Aging tends to speed it up. Regular exercise tends to slow it down. (In his prime, champion cyclist Lance Armstrong had a resting heart rate of just 32 beats per minute.) Stress, medications, and medical conditions also influence the heart rate.

In today’s Journal of the American Medical Association, researchers from Norway report Read more »

*This blog post was originally published at Harvard Health Blog*

Study Provides Reassuring Evidence Regarding ADHD Drugs

If your child is being treated for attention deficit hyperactivity disorder (ADHD), you may have one less thing to worry about today. A study involving 1.2 million children and young adults provided reassuring evidence that the drugs used to treat ADHD do not increase the risk of death from heart disease.

Researchers, who published their results yesterday in the New England Journal of Medicine, analyzed medical records from a nationwide private insurance plan along with health plans based in Tennessee, California, and Washington State. They compared children taking stimulant drugs (like Ritalin and Adderall) that are commonly used to treat ADHD to children not taking these drugs.

Among all of the children, heart attack, stroke, or sudden death were rare, affecting a little more than 3 in every 100,000 children per year. Cardiac problems were no more common among children using a stimulant as among those not taking one.

The study Read more »

*This blog post was originally published at Harvard Health Blog*

Researchers Develop App That Measures Many Key Vital Signs

Post image for Forget about peripheral mhealth devices, researchers use smartphone video camera to monitor useful vital signs

Researchers at Worcester Polytechnic Institute have developed a smartphone app that uses a camera to measure key vital signs. The type of technology used by the Worcester researchers is far and above more useful than a simple heart rate monitor, such as the Instant Heart Rate app.

Recently, the Instant Heart app makers received millions in funding – I hope it wasn’t based solely on the heart rate monitor app they have developed. Having a a patient’s heart rate alone isn’t that useful for a clinician, and it’s extremely easy to measure your heart rate on your own, just put your fingers to your wrist or neck.

But the work by Worcester researchers is completely different, exciting, and unlike the Instant Heart Rate app, Read more »

*This blog post was originally published at iMedicalApps*

Heart Rate: What’s Normal?

The “normal” number of heartbeats per minute is very much a frequently asked question. People, especially medical people, like well-defined lows and highs. Parameters which can be assigned an ‘L’ or ‘H’ makes life easier.

2009 National Championship Masters (45-49) Road Race

As a modern-day competitive cyclist, I am immersed in a sea of information. In our quest for weekend glory, minutia like speed, wattage outputs, RPMs, torque, elevation gain and of course, heart rates (highs, lows, and averages) get recorded, downloaded, and then studied intensively.

As a heart rhythm specialist, it is a frequent occurrence to see patients referred for low or high heart rates. More often than not, heart doctors are called upon to adjudicate patients who fall outside the “normal” values.

The old school teaching holds that the normal resting heart rate is greater than 55 and less than 100 beats per minute (bpm). Maximal heart rates are estimated by the Read more »

*This blog post was originally published at Dr John M*

Tips To Beat The Heat

Dehydrated, cramped, limping? on a bike. Road nationals 2010.

People who exercise outdoors face a new threat.

It’s unrelenting.



Perhaps, even more dangerous than distracted or mean motorists.

It’s the heat. Gosh, is it hot. If only I had a dollar for every time I heard someone say, “Doctor M, you aren’t riding in this heat; are you?”

Well…Other than the fortunate souls smart (or lucky) enough to live in cooler climates, most of us are facing an extreme wave of hotness. As a Kentuckian, I live in the epicenter of this summer’s cauldron. Louisville sits in a wind-protected valley alongside the heat sink that is the Ohio River. Think hot and steamy.

The excessive heat smacked me hard last evening. Normally, my highly-veined skin and northern European heritage serves me well in the heat. But last night, while riding in sight of our city’s skyline, it started: My mouth grew dry and my breathing labored. And why was that helmet feeling so tight? Next came the sensation of tingles—not the pleasant kind of tingles, like when your teenager hugs you. And then came the deal-breaker: chills. I stopped, swallowed my pride and called for a ride home. (Here’s an always for you all: When it’s ninety degrees out and you feel cold–stop exercising, immediately.)

After last night’s brush with heat exhaustion, I thought it reasonable to ramble on about the dangers of exercising in the heat. And of course, I will offer some nuggets of wisdom for beating the heat. Read more »

*This blog post was originally published at Dr John M*

Latest Interviews

IDEA Labs: Medical Students Take The Lead In Healthcare Innovation

It’s no secret that doctors are disappointed with the way that the U.S. healthcare system is evolving. Most feel helpless about improving their work conditions or solving technical problems in patient care. Fortunately one young medical student was undeterred by the mountain of disappointment carried by his senior clinician mentors…

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How To Be A Successful Patient: Young Doctors Offer Some Advice

I am proud to be a part of the American Resident Project an initiative that promotes the writing of medical students residents and new physicians as they explore ideas for transforming American health care delivery. I recently had the opportunity to interview three of the writing fellows about how to…

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Latest Book Reviews

Book Review: Is Empathy Learned By Faking It Till It’s Real?

I m often asked to do book reviews on my blog and I rarely agree to them. This is because it takes me a long time to read a book and then if I don t enjoy it I figure the author would rather me remain silent than publish my…

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The Spirit Of The Place: Samuel Shem’s New Book May Depress You

When I was in medical school I read Samuel Shem s House Of God as a right of passage. At the time I found it to be a cynical yet eerily accurate portrayal of the underbelly of academic medicine. I gained comfort from its gallows humor and it made me…

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Eat To Save Your Life: Another Half-True Diet Book

I am hesitant to review diet books because they are so often a tangled mess of fact and fiction. Teasing out their truth from falsehood is about as exhausting as delousing a long-haired elementary school student. However after being approached by the authors’ PR agency with the promise of a…

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