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Modern smart watches can measure an array of health indicators. Step counts and heart rates sit at the simpler end, while VO2 max and blood-oxygen levels are mainly of interest to committed health nuts. The newest addition to the category is heart-rate variability (HRV).As its name suggests, HRV measures not how quickly the heart beats, but how regularly spaced those beats are. With heart rate a lower score is usually better, other things being equal, since it suggests a high level of cardiovascular fitness. When it comes to HRV, though, a higher number—that is, a more irregular pattern—is generally what...

— However, observations do not fall into territory of harm, according to exercise physiologistsSmall physiological changes can result from wearing an N95 mask all day, including during light exercise, a small trial found. Whether this has practical implications for mask users is unclear, however, as exercise physiologists said they were not convinced by the data. Compared with unmasked controls, 15 young healthy volunteers randomized to wear an N95 mask for 14 hours (from 8 a.m. to 10 p.m.) in a metabolic chamber had a reduced respiration rate and lower oxygen saturation by pulse oximetry within the first hour, while...

WASHINGTON (Reuters) - U.S. Attorney General Eric Holder was treated for an elevated heart rate at a Washington, D.C., hospital on Thursday but later walked out of the hospital without needing assistance and was resting comfortably at home, his office said. Holder, 63, the chief U.S. law enforcement official, felt lightheaded and short of breath during a morning staff meeting, according to a statement from his office. He never lost consciousness, and stayed at the hospital for about three hours for tests. Although he was given medication to restore his heart rate to a normal level, doctors ruled out the...

After years of stomping around the grizzly haunts of the wildest coast of North America without a serious bear encounter, forester Rick Rogers never imagined the first and only close call of his life would come in an Anchorage park visited by thousands of people. SNIP . . . He thought his maximum heart rate was 180. He later looked at the monitor and realized he'd hit 193.

New workout that might leave some red in the face from more than fatiguePLEASANT HILL - They don't wear glitter or platform heels, and there are no dollar bills for incentive, but that doesn't stop a group of cardio enthusiasts from Trainers Source and Living Fit from swinging their hips and showing a little leg. The joint partnership exercise and personal training studio began offering a cardio striptease class that the owners say is a fun workout targeting the entire body.Fitness instructor and co-owner Christina Perez said cardio striptease is the latest exercise craze, hyped up by the women of...

<p>According to the Cable News Network ticker, Private First Class Jessica Lynch has been moved to intensive care as a precaution in Landstuhl, Germany to monitor fever, increased heart rate and any possible infection.</p> <p>Not mentioned whether her family did visit her in the ICU ward when thye came.</p>