Originally Posted by
MoAlpha
From what I hear, no optical device can give really accurate R-R intervals. I use an old Polar chest strap for HRV and an optical device on the bike. The processing side of WHOOP sounds to me like expensive voodoo.
Correct, and even if someone is using a chest monitor the value of HRV is still largely unproven.
That won't stop WHOOP from making plenty-o-dough, however.