As the athlete progresses through the range of motion, the resistance increases, with the greatest resistance being at the end range of motion, where most sporting movements occur.
Taking into account joint angles and accommodation of these angles for transfer of training, this method of training makes sense.
Free weights and weight resistance cable machines are a great mechanism for overloading the body as they provide resistance throughout an entire range of motion and require activation of the body’s stabilizer mechanisms to control movement.
The speed of movement can vary from isometric to ballistic, while maximally recruiting large groups of muscle fibers.
In essence this makes sense, in that the end ranges of motion are going to receive greater stimulation due to heavier loads, but the maximal muscle recruitment patterns are altered with squat depth.
To run faster and jump higher, an athlete needs to be capable of generating great force from the powerful hip extensor mechanism.“During the partial squat they found 69% recruitment from the quadriceps, 16.9% recruitment from the gluteus maximus, and 13.37% recruitment from the biceps femoris (Not sure why adductor magnus was not tested?? In contrast, the parallel squat had 56.64% recruitment from the quadriceps, 28% recruitment from the gluteus maximus, and 15.35% from the hamstrings (4).” The glute activation nearly doubled, when increasing the range of motion from quarter squat to parallel squat, while the hamstring recruitment stayed the same.With this knowledge, an athlete lacking in posterior chain development, specifically hip extension power from the glueus maximus, may want to perform squats to at least the parallel position, assuming no pre-existing injuries in the low back or knees.There are three major mechanisms for strength training involving dynamic voluntary muscle contraction against external resistance.Those being free weights, selectorized or plate loaded machines, and band (elastic tension) training.to make suitable or consistent; adapt: to become adjusted or adapted.In the world of strength and conditioning and performance enhancement, scientific research findings are vastly improving training methodologies program models, and equipment design.Free weights do have a shortcoming when it comes to performance enhancement for athletes.‘One is limited in the amount of weight they can lift by the weakest point of the range of movement (3).” After working through the “sticking point” (weakest point), as the joint angle nears end range of motion, the muscles have greater leverage to perform the movement.For example the drive phase (foot in contact with ground) of sprinting typically occurs with knee flexion of about 135degrees or greater and the same can hold true (not always, though) for some of your best performers in the vertical jump test. An athlete may max out at 315 in the parallel squat, but may max out at 375 in the quarter squat.The limiting range of motion of the parallel squat is parallel (bottom position with joint angle of roughly 90 degrees), and for the quarter squat it may be 130 degrees.