Three men who were paralyzed from the waist down are able to walk again with a new type of therapy that uses electrical stimulation, scientists announced today. More than four years prior, the men had all suffered major spinal cord injuries that left them with limited or no movement in their legs.

Researchers in Switzerland applied stimulation to the men’s spinal cords with a wireless implanted device that emits pulses of electricity. Within a week, the men could stand up and walk using supports. After five months of physical therapy and training with the technology, all three were able to voluntarily control their leg muscles and walk for as long as an hour without muscle exhaustion.

The results, published in the