Andrew Huberman· PhD
You've got HRV, which requires some technology usually. You've got grip strength, which you can assess subjectively or you can use a floor scale and now you have carbon dioxide tolerance.
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The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
You've got HRV, which requires some technology usually. You've got grip strength, which you can assess subjectively or you can use a floor scale and now you have carbon dioxide tolerance.
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The two that I'm aware of for gauging recovery of the nervous system and kind of systemic recovery, are grip strength, especially grip strength on waking in the morning. And the so-called carbon dioxide tolerance test.
And then the carbon dioxide tolerance test.
When and how can I use the carbon dioxide tolerance test to gauge recovery upon waking, post-training session?
if you don't have a device like that you could also use honestly the CO2 tolerance test and we've talked about that a number of times and we probably have plenty of resources to go find that uh but that doesn't require anything it typically takes about a minute or so and you can do that under the same circumstances in which HRV in other words do it the same time every day have the same standardization stuff and that is actually been in our coaching experience um while admittedly there is no peer- reviewed research on this yet um just in our experience this tends to track extremely closely with HRV and other metrics of recovery
Use carbon dioxide discard rate because A, it's valuable. It's informative. B, it's zero cost. C, it's something that you can track objectively over time. That's really the key.
The other one that's really terrific is carbon dioxide tolerance. This is a really interesting tool that endurance athletes, strength athletes, I think can all benefit from.