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Science
What Makes Muscle Fiber Types Matter in Sport

What Makes Muscle Fiber Types Matter in Sport

Elite distance runners carry about 79 percent slow-twitch fibers versus 58 percent in untrained men, and sprinters flip the ratio. But two marathoners with 50 and 98 percent slow-twitch fibers ran the same time, so fiber type opens doors rather than crowning winners.

Santiago Rodriguez
Fitness

How to Choose a Fitness Tracker That Actually Fits Your Life

Buy for the number you will act on: heart rate reads close to a chest strap in lab tests, calorie burn does not, and sleep scores work best as weekly trends. Accuracy, features, and comfort decide the right pick.

How to Choose a Fitness Tracker That Actually Fits Your Life
Bianca Reyes

Training

Athletes

Science

Science
How Wearables Measure Heart Rate Variability

How Wearables Measure Heart Rate Variability

Watches and rings derive heart rate variability from the pulse wave using photoplethysmography, while chest straps read the heart's electrical signal. Studies show the methods agree at rest, with error bars that widen under strain and noise.

Bianca Reyes

Sports News