Hamstring machines disrupt quadriceps contraction, which can be compensated by its tendon at the distal attachment or by the glutes tightening the hip complex. Preacher Curls disrupt the triceps contraction, usually results in overcompensation of the bicep tendon or shoulder joint or both.
Leg Extensions disrupt hamstring contraction, results in overcompensation of the quads stressing the patellar tendon. For example:Ĭhest Press disrupts scapular rhythm, usually results in overcompensation in the shoulder joint. One of the inherent problems with machine training is they usually fix one or more of the contributing muscle groups. This would be analogous to not having enough players to play the game but playing anyway. If you happen to fix or mechanically inhibit a muscle group, you put a handicap in performance. There is never just one muscle firing there are muscle groups that work together as a team to execute movement. Now here’s the problem: the musculoskeletal system operates like an orchestra. If this is out of balance, overcompensation occurs in surrounding musculature to pick up the slack, which greatly increases the risk of injury due to overuse or lack of synchronicity during movement.įor instance, during a bicep curl, the triceps have to resistively contract just as hard as the biceps so that the bicep doesn’t rip out of the arm and the shoulder doesn’t have to pick up the slack, which can lead to injury. For effective and safe movement, the resistance factor has to be just as strong as the contraction factor. The Resistance-Contraction Factor is about the balance of the contracting (agonistic) musculature against the antagonistic musculature. Putting someone on a machine like this breaks a rule, the R-C Factor, of body movement and mechanics. There is no carryover or benefit in a movement sense with these machines because there are hardly any situations when the hamstring moves in the fashion that these machines train them in. There is certainly a role for these types of machines as well as others in certain situations, but in the grand scheme of movement, fitness, performance and functionality, the hamstring machines provide little utility. I would like to preface this answer by begging the question of your purpose in including these exercises when designing a program. There are functional and mechanical differences between these two machines. What is the difference in hamstring recruitment when using the Seated Leg Curl where the hips are flexed, compared to the Prone Leg Curl where the hips are almost extended? Answer: If you are exploring the wide world of Corrective Exercise, this content will help you become that much closer to mastering movement. To truly get the most out of your workouts, you must know which muscles are worked and activated when you use certain machines.įor the Seated Leg Curl and Prone Leg Curl, there are differences in hamstring muscle recruitment.īut did you know that these machines put you in unnatural movement positions and that there is virtually no carryover when performing the machine-based movements of the Seated and Prone Leg Curl machines?
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