The iso-inertial training is the methodical one that makes use of machines in which the resistance is generated by a mass placed in rotation. It is so defined because the athlete works against his inertia force (which is opposed to movement). Resistance in isoinertial machines is purely proportional to acceleration: at constant speed the resistance is zero; therefore, an iso-inertial exercise takes place in continuous acceleration / deceleration. The properties of the platform make it possible to emphasize not only the concentric phase of the exercise, as with the use of isotonic loads, but also and above all the eccentric phase, also called the load resistance phase.



This type of contraction occurs when the muscle generates a force, contracts and shortens, so that the moment generated by the internal forces acting on a joint is greater than the moment generated by the opposing external forces. It is evident that following a concentric muscle contraction a movement of the articular segment is created in the direction of the force generated by the activated muscle (this indicates positive work). This type of contraction develops less force than isometric and eccentric contractions because part of the energy is dissipated in heat to move the bone heads.



This type of contraction occurs when a muscle generates an internal force that is less than an external one (antagonist muscle or external force) that acts in the opposite direction. The muscle therefore, instead of shortening becomes longer: the external moment will be greater than the internal one. During this type of contraction there is a specific relationship between maximum force generated by the muscle and elongation speed: the amount of force exerted by the muscle is directly proportional to the speed of elongation. If the resistance is maximum, the muscle is not able to withstand it and stretches uncontrollably.


  • Better affinity of muscle activation with sports performance;

  • Better expression of strength than free weights;

  • Possibility of modulating the muscular effort;

  • Early hypertrophy;

  • Possibility to move away from the verticality of the movement;

  • Work feedback via software; Reduced overloading on the back compared to traditional methods;

  • "Free" movement, unconstrained as in traditional isotonic machines;

  • Easy transport, small footprint;

  • Resistance is variable in every instant in iso-inertial work and depends on the speed and strength we develop. At any time you can decide how to characterize the training.




The isoinertial training as well as being an excellent tool for athletes, it is also for the facilitation in rehabilitation and functional recovery therapies, medical and not, thanks to the need for a reduced cardiovascular effort compared to other recovery activities. In fact, in the rehabilitative field, the isoinertial devices allow to recreate muscular activation situations directly linked to the athlete's accelerations, modular and directly proportional to the expressed force, more easily reaching greater workloads and a better muscular conditioning, as well as recovery times. faster. The eccentric work has a fundamental importance on the recovery of muscle-tendon injuries.




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