Searched to no avail.
Older athlete (turning 57) and this has plagued me for at least a couple of years. If I jump up and land (e.g. plyometrics or playing catch with my wild pitching son), my legs immediately seize/ache in the quadriceps (rectus femoris and vastus medialis) and I can’t move… I can’t run nor can I jump. On the bike I sometimes feel it at the beginning of my ride in terms of stiffness and pedaling squares. The sensation improves as I get the blood flowing. Training-wise I do 10 - 15 hours/week riding depending on the schedule…
Perhaps you’ve had similar experience(s) and can assist? Sure would appreciate some help.