The most important number for your health (feat.

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The most important number for your health is how you feel. Hang on, this is a science channel, not an Instagram account for motivational wellness quotes. Let’s take a data-driven look at the numbers you can get from a smartwatch or other wearable device, and find out which is the most important one to optimise your health.
This video is part of my series on smartwatches. Go check out the rest of the videos in this playlist: • Smartwatches series
Chapters
00:00 Introduction
01:03 Resting heart rate
03:08 Exercise heart rate
05:47 Steps
09:30 VO₂ max
13:31 The best thing about wearables
15:03 Rohin’s most important number
16:35 Andrew’s most important number
Sources and further reading
Resting heart rate
Risk of death, cardiovascular disease and cancer vs resting heart rate pubmed.ncbi.nlm.nih.gov/28552...
Exercise heart rate
The previous video in the series in which I tested watches’ performance during exercise • Can you trust your sma...
Steps
Step count and all-cause mortality, including evidence for 10,000 steps as a goal, and analysis of ‘purposeful’ and ‘incidental’ steps jamanetwork.com/journals/jama...
The same group found that doing more steps also reduces your risk of dementia! jamanetwork.com/journals/jama...
VO₂ max
Meta-analysis of VO₂ max in consumer devices link.springer.com/article/10....
Fitbit Charge 2 VO₂ max accuracy journals.lww.com/acsm-msse/Fu...
Garmin Fenix 5 VO₂ max accuracy scholarsjournal.net/index.php...
Change in VO₂ max with age via
www.ncbi.nlm.nih.gov/pmc/arti...
And if you write VO₂ max as ‘VO2 max’ or ‘VO2max’, this line hopefully means you’ll still find this video!
And finally…
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