Electromagnetic resistance: Is there a need?

Authors of a recent study compared the effects of electromagnetic resistance alone, as well in combination with variable resistance or accentuated eccentric methods, with traditional dynamic constant external resistance exercise on myoelectric activity during elbow flexion. The study included 16 young, resistance trained male and female volunteers who's average age was ~25 with a training experience of 6.7 years (a potential limitation of the study inline with the study being specific to elbow flexion).

Firstly lets cover a few terms: 

Electromagnetic resistance = creates resistance via opposing magnetic fields

Variable resistance = The resistance varies throughout the movement (The Medx machines provide this)

Accentuated eccentrics OR Eccentric Overload = More resistance is added when lowering a weight (like X-Force). 

Constant Resistance = the external load remains constant throughout the movement like in a dumbbell bicep curl. 

The findings? The authors concluded that all conditions provided a sufficient stimulus for strength improvements in the muscle. BUT.. in terms of  improving maximum muscle strength, it has been shown that Variable Resistance Training (found in Medx equipment) is better than Constant Resistance Training (i.e., free-weights, cables) in improving maximum muscle strength in both trained and untrained subjects. That is why we use equipment that is effective to provide your muscles with the adequate stimulus it needs.

How can you use this? If your goals is to improve your strength, all different training applications work and can be applied to your training programme. 

Study: Zambrano et al. (2023). Myoelectric activity during electromagnetic resistance alone and in combination with variable resistance or eccentric overload.  Scientific Reports, 13(8212). https://www.nature.com/articles/s41598-023-35424-w