if the quads contract too much, then there is a possible danger that the tendon could be damadged.
Quadriceps tendon
quadriceps femoris
quadriceps :)
you have then stretched your tendon / muscle beyond the normal range .
A strain is a torn or stretched muscle or tendon.
The quadriceps muscle goes over the patella. The patella is encased in the quadriceps tendon. This tendon inserts on the tibia at the tibial tuberosity. Other muscles from the thigh have tendons which go underneath the patella.
Patella
Vastus medialis (a tear-shaped muscle right above your knee)
The two tendons that are attached to the patella are: the quadriceps tendon, which attaches above, and the patellar tendon, which attaches on the bottom
Golgi tendon Muscle spindles
Tapping on the patellar tendon stretches receptors called the muscle spindles in the quadriceps muscle group of the anterior thigh. This stimulus evokes a rapid motor reflex to contract the quadriceps and shorten the muscles. This process is called the patellar reflex.
The great extensor muscle of the knee, divided above into four parts which unite in a single tendon at the knee.