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watchOS 27 records HRV for just 4 minutes per hour. Fitbit AIR locks on late and generates false intervals. WHOOP MG on the biceps matched a chest-strap ECG to within ±2.5 bpm. Fiv...
Optical heart rate monitors behave differently across skin tones and wrist sizes, but the research is less settled than the headlines suggest. Here is what the controlled studies a...
Accuracy is the name of the health tracker game, so I put Google's latest device to the test.
The Amazfit Cheetah 2 Ultra was put through a HYROX simulation in a gym at 33°C. Optical HR matched reference devices across all comparisons, with near-zero bias against Whoop MG,...
Five devices, one HYROX simulation, and a post-gym pub trip. Fitbit Air produced the widest error range of anything on test. Whoop MG on the biceps was essentially tied with Amazfi...
I tested them against the Apple Watch and the Polar chest strap to find out whether you can trust them for your workouts.
Every review of the Fitbit Air noted the 2-second sampling rate and moved on. Nobody connected it to the n values in DCR Analyzer or what they mean for sport. This is what the spec...
The Amazfit Cheetah 2 Ultra returns ±3 bpm limits of agreement in a road bike sprint HR test, outperforming the Fitbit Air's ±6 bpm. Full results against Whoop MG and Polar Verity...
A 150-minute Z2 endurance ride with Frontier ZONE, Whoop MG, Fitbit Air, and Amazfit Helio Strap surfaces a statistical methodology problem that distorts published accuracy compari...
The Amazfit Balance 3 delivered near-chest-strap HR accuracy over 108 km in 26°C heat at the Dartmoor Classic. GPS was good on open moorland but drifted on tree-lined descents. hDr...
The Amazfit Balance 3 ran its first HYROX sim test alongside hDrop sweat analysis, Whoop MG, and Garmin Forerunner 970. HR bias was around 3 bpm high with one cadence lock incident...
Apple’s AirPods Pro 3 heart rate sensor averaged 1.67% error compared to a medical-grade Polar H10 chest strap in testing by CNET Labs, making the earbuds the second most accurate...
One of the flagship additions to the AirPods Pro 3 was a built-in heart-rate sensor, which allows users to track more than 50 workout types. But how accurate is it?
No Fitbit Air arm band exists yet. This is how I wear the Air pebble on the bicep using a Whoop Any-Wear sleeve, plus the accuracy test result: near-zero bias vs Polar Sense, Apple...
Fitbit Air produced cadence-locked HR during an indoor treadmill interval session, averaging ~157 bpm against a reference of 131-132 bpm. Every metric derived from that data — TRIM...
It’s post-workout, you’re tired and ready to refuel. Your smartwatch gives you an automated calorie burn. But research and a dietitian caution against using it. Here's why. Read th...
A man in his fifties collapsed during a half marathon in 34-degree heat. The Fourth Frontier Zone is built for exactly that scenario. Tested across five sessions with real bias and...
I tested the Amazfit Balance 3 for swimming HR accuracy alongside the FORM Smart Swim 2 LT goggles at an outdoor pool. The lap counting was flawless. The HR picture is more nuanced...
Ever check your smartwatch or Oura ring and notice your resting heart rate is higher than you expect? You do your best to follow a healthy diet and get regular physical activity, s...
Last week after training a client at the 55+ community, I stuck around to try a little tech experiment on the clubhouse indoor track by walking three individual miles to test three...
If you want to monitor your heart rate and more while you exercise, these are the chest strap heart-rate monitors you'll want to consider.
If you're a data-oriented runner, you'll love the extra layer of insight.
Fitbit Air lost my open water swim data for hours. The fix is to record swims as runs. HR accuracy result: Fair to Poor, with an 11 bpm underestimate bias against the Fourth Fronti...
The Amazfit Cheetah 2 Ultra scores 81% on a standardised 10-mile GPS accuracy test — better than the Cheetah 2 Pro, behind the Forerunner 970. Dual-frequency GNSS confirmed. Here's...
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