Health care in your hands

gained an onstage endorsement from Ivor Benjamin, a cardiologist who is president of the American Heart Association. He said such real-time data would change the way doctors work.

Gartner analyst Tuong Nguyen said the feature could turn smartwatches “from something people buy for prestige into something they buy for more practical reasons.”

It could also lead some health insurance plans to subsidize the cost of an Apple Watch, Nguyen said. That would help defray the $400 starting price for a device that still requires a companion iPhone, which can now cost more than $1,000.

Apple’s watch will use new sensors on the back and on the watch dial. A new app will say whether each reading is normal or shows signs of atrial fibrillation, an irregular heart rate that increases the risk of heart complications, such as stroke and heart failure.

Apple says the heart data can be shared with doctors through a PDF file, though it’s not yet clear how ready doctors are to receive a possible flood of new EKG data from patients — nor how useful they will find the electronic files.

Eric Topol, a cardiologist and director of the Scripps Research Translational Institute, warned that the EKG feature could spur more tests than necessary, result in unnecessary prescriptions for blood thinners and overwhelm doctors with calls from patients who probably don’t need treatment.

He said that while the feature will probably save some lives and prevent strokes with early detection of heart trouble, “the ratio between the benefits and the costs remains a big unknown.”

Apple said the EKG feature will be available to U.S. customers later this year, an indication that it may not be ready for launch.

Fall detection could also be significant, especially for elderly users. The new Apple Watch claims to be able to tell the difference between a trip and a fall — and when the latter occurs, it will suggest calling 911 (or the equivalent outside the U.S.). If it receives no response within a minute, the watch will automatically place an emergency call and message friends and family designated as emergency contacts.

Only certain Apple Watch models support cellular calls, but those that don’t can still make emergency calls when near a paired iPhone or Wi-Fi service.

Apple says it monitored some 2,500 people — measuring how they fell off ladders, missed a step while walking or got their legs caught in their pants while getting dressed. It used that data to separate real falls from other heavy wrist movements, such as clapping and hammering.

The feature is available immediately worldwide and will turn on automatically for users 65 and over. Younger people can activate it in the settings.

“I can see kids buying one for their parents and grandparents,” analyst Patrick Moorhead of Moor Insights said.

But the Apple Watch still lacks one feature found in rival wrist gadgets: the ability to analyze sleep quality. Battery life in the new watch remains at 18 hours, meaning it needs a nightly recharge.

ASSOCIATED PRESS Jeff Williams, Apple’s chief operating officer, speaks about the Apple Watch Series 4 at the Steve Jobs Theater during an event to announce new Apple products Wednesday, Sept. 12, 2018, in Cupertino, Calif.

ASSOCIATED PRESS Mark Holloway of Clemmons, N.C., goes through part of his exercise routine. Companies are offering discounts on tech products to employees to help them stay fit.