Studies have shown that negative repetitions or "eccentric phase training" combines a high amount of force on the muscle with a lower energy cost than normal concentric training, which requires 4–5 times the amount of energy.
This justifies why this type of training is more beneficial and less of a risk to subjects rehabilitating or with a limited exercise capacity.
Studies have shown that eccentric training of the lower body, in particular the knee extensors, are essential in preventing falls in older adults and helping them maintain their independence.
[5] With this evidence, it is reasonable to suggest that negative repetitions can help improve the health of older adults.
Studies have shown that the use of eccentric training for twelve weeks may be an alternative to therapy for people suffering from Patellar Tendinopathy (Jumper's Knee).