Post-activation Performance Enhancement in Soccer Players:

In this protocol, the load determined for footballers during knee extension will be applied as 90% of their one repetition maximum (1TM). After a standard warm-up session at the beginning, the protocol will be performed by performing 1 set of 3 repetitions with the previously determined 1TM 90% load without resting between repetitions. Isometric knee extension exercise will be used in the protocol. The movement will be performed sitting, in a position suitable for limb lengths and in a controlled manner using a leg extension machine. At the beginning of the movement, the knees will be flexed 90° and the adjustable lever arm of the machine will be fixed at this angle. Then they will be asked to perform bilateral isometric knee extension until the knees form a 180° angle. They will also be verbally motivated to complete the knee extension exercise.

Isometric contraction will be used in the protocol. On the leg extension machine, the protocol will be performed by applying 3 sets of 3 seconds against the lever arm only with 1TM 90% load, 2 minutes rest will be applied between sets. Isometric knee extension exercise will be used in the protocol. The movement will be performed sitting, in a position suitable for limb lengths and in a controlled manner using a leg extension machine. At the beginning of the movement, the knees will be flexed 90° and the adjustable lever arm of the machine will be fixed at this angle. Then they will be asked to perform bilateral isometric knee extension until the knees form a 180° angle. They will also be verbally motivated to complete the knee extension exercise.