
James Stables
James Stables is a wearable tech expert and Content Lead at Ultrahuman. He was the founder of Wareable and spent 15 years as a journalist and publisher in the technology and health space.
49 articles

Best Ultrahuman PowerPlugs
We list all of Ultrahuman's PowerPlugs, how to install them, and the technology and insights behind these added health capabilities.
Nov 06, 2026
How Ultrahuman and More Than Equal are closing the gender data gap in motorsport
How Ultrahuman and More Than Equal are partnering to help young female racers perform at their best, in the quest to find the first female F1 …
Nov 05, 2026
Ultrahuman study of 105,196 nights sleep reveals glucose and sleep link
An Ultrahuman study has revealed the huge benefits of simply going to sleep at the same time every night
Nov 02, 2026
Why sleep consistency is the power-up for your health you're missing
New data from an Ultrahuman study of 105,196 nights sleep shows how inconsistent sleep affects both glucose and heart rate
Nov 02, 2026
What is 'phubbing' and how it can affect your kids
Phubbing is when you ignore someone in front of you while checking your phone. We've all done it, but we explain why effects can run deeper than …
Oct 26, 2026
Screen time and stress explained – and the surprising effect on HRV
We look at the evidence about phone use and stress, why heart rate variability can drop when phone use drops – and why that can be a good thing
Oct 26, 2026
How to reduce screen time for better sleep and healthier connections
We outline ways to reduce your screen time for better sleep and being more present
Oct 21, 2026
How clock changes and DST affect your sleep
Discover how Daylight Saving Time disrupts your circadian rhythm and how your Ultrahuman Ring adapts to keep your sleep, recovery, and body clock on …
Oct 19, 2026
Revealed: How long Ultrahuman Ring users took to recover from lost sleep
It took Ultrahuman Ring users longer than you might think to recover from lost sleep – here's what the data says
Oct 07, 2026
Heart rate variability (HRV) explained & how to increase it
We explain HRV, and the science behind this important wearables metric – and finally, what it says about your health.
Oct 05, 2026
Blue light explained: How it affects your sleep and body clock
We explain the science behind blue light wavelengths and how it affects sleep onset, as well as how to mitigate its effects
Oct 05, 2026
12 ways to increase heart rate variability (HRV)
We list science-backed ways to increase HRV in the short and long term to promote better performance and your rest-and-digest nervous system
Oct 01, 2026
How the Ultrahuman Ring tracks skin temperature
We explore how the Ultrahuman Ring AIR tracks skin temperature, and how to use the data for better health insights
Sep 30, 2026
The surprising effect of inconsistent sleep on your body
Ultrahuman research suggests inconsistent sleep elevates heart rate and impacts recovery
Sep 29, 2026
Why a good night's sleep starts with morning light
We explain why exposure to morning sunlight can help you sleep better – and how much you need to shift your circadian rhythm
Sep 28, 2026
Why last night's sleep might be worse than you think
A peer-reviewed study using Ultrahuman Ring AIR has indicated that people's perception of sleep quality is often different from reality
Sep 25, 2026
Blue light-blocking glasses explained – and how they improve sleep
Blue light frequencies have been shown to destroy sleep. We explain the science and how blue light filtering glasses can help
Sep 24, 2026
Does magnesium actually make you sleep better? What the evidence shows
We reveal the limited evidence behind magnesium and sleep, when it can be effective and what Ultrahuman Ring data shows
Sep 22, 2026
How the Ultrahuman Ring tracks sleep stages
How the Ultrahuman Ring identifies light, deep and REM sleep from pulse, movement and skin temperature, and how to read the results.
Sep 16, 2026
Introducing improved VO2 Max on Ultrahuman Ring
Ultrahuman's VO2 max estimate is now calibrated directly against lab testing (CPET). Here's what's new, and why your score may change.
Sep 14, 2026
Famous athletes' resting heart rates and how they compare to normal adults
Discover the athletes with the lowest ever resting heart rates – and how they compare to normal adults and Ultrahuman Ring users
Sep 09, 2026
England v Mexico: How the 2am kick-off affected the nation’s sleep and recovery
Ultrahuman Ring data reveals how England's 2am World Cup kick-off against Mexico cut the nation's sleep, lowered HRV, and affected overnight recovery …
Jul 14, 2026
HRV Chart By Age: 528,000 Ring Users' Heart Rate Variability Compared
We analysed 79 million nights of Ultrahuman data to map how heart rate variability shifts with age, and why your personal baseline beats population …
May 21, 2026
Full circle: Ultrahuman returns to Kickstarter with special Ring PRO bundle
Ultrahuman is returning to Kickstarter with an exclusive Ring PRO bundle for the community that backed us first.
May 04, 2026