I know that stress can drive BG higher. I’ve noticed that several hours after riding and post prandial that BG is generally higher. Most days I don’t ride the PP number is low 7s to low 6s, but on riding days it can top 9. I tend to drink less liquid while I’m out on a long ride, but I’m not eating anything different to a would on a day when I’m not riding. All things being equal I’m suspecting it’s the stress of riding ?
That or the adrenaline.
Bear in mind, riding a bike, as you well know, requires a lot more attention to the ride, than if driving a car, imho.
The constant readjustment of speeds might be the same, but I'd say the reaction times, rapidity & sheer exhilaration are of a magnitude several levels higher for Riders V Drivers.
I don't ride since an accident, so I can't check that out for you, sadly.
But I never really noticed that myself, but I wasn't looking for it, tbh.
If it isn't the fact, each ride perhaps consists of any extra 'treat' if meeting up with friends for instance ?
I'd say, like exercise (and the physicality of riding qualifies, in my book ) the exertion combined with stress/good obs & big cheesy grin after a ride
Do seem like very likely suspects.
Be interesting what other bikers make of it ....mmhh.
Travel safe, my biker friend.