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Heart rate estimation shot down by experts

Posted: February 17, 2014 at 2:03 a.m.

“Subtract your age from 220” is a familiar bit of exercise class math. It’s the first step for figuring out maximal heart rate — the top number used in heart rate target zone training.

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ActiveStyle, Pages 23 on 02/17/2014

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Exercisers defy gravity on machine designed f...

Arkansas Democrat-Gazette/CELIA STOREY
Physical therapist Derek Lagemann shows Tom Singleton how to run on the Alter G anti-gravity treadmill at PTI physical therapy in Little Rock on Jan. 14

Anti-gravity treadmills have landed in Arkansas. Read »

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Officials herald U.S. solar-power milestone

Some of the 300,000 computer-controlled mirrors, each about 7 feet high and 10 feet wide, reflect sunlight to boilers that sit on 459-foot towers. The sun's power is used to heat water in the boilers' tubes and make steam, which in turn drives turbines to create electricity Tuesday, Feb. 11, 2014 in Primm, Nev. The Ivanpah Solar Electric Generating System, sprawling across roughly 5 square miles of federal land near the California-Nevada border, will be opened formally Thursday after years of regulatory and legal tangles. (AP Photo/Chris Carlson)

PRIMM, Nevada — A windy stretch of the Mojave Desert once roamed by tortoises and coyotes has been transformed... Read »