Supporting front crawl swimming in paraplegics using electrical stimulation: a feasibility study.

Only two participants were studied, both complete ASIA A Th5/6 injuries and already proficient front-crawl swimmers, so the results cannot be generalised to most people with spinal cord injury. The study compared conditions within the same two participants and did not use sham tSCS, so placebo effects, training order, and the prior FES cycling phase cannot be separated from the stimulation effect. Participants completed 6 and 7 of the possible swim sessions, and the pool was unavailable once, so the training dose varied. Measurements were taken in a 16 m pool, and the authors state that lap times are error-prone for short tracks because start technique and occasional extensor spasms influence them. The post-training assessment occurred 9 months after training; Subject B had not trained in the interim and fatigued early, so the later motion and lap-time results may not reflect the training period. Spasticity relief was based on the participants' reports, not an objective spasticity measurement. The contribution of swimming, prior FES cycling, FES, and tSCS to the observed changes cannot be separated. No arm-leg synchronization was used, and the stimulation patterns were crude and heuristically derived, so the effect of optimized stimulation is unknown. Metabolic efficiency was not measured, so the physiological benefit of the exercise is not established.

Do not conclude that FES plus tSCS is proven to improve swimming speed or reduce spasticity in paraplegia. This was a two-person feasibility study with no control group, no sham tSCS, subjective spasticity reports, and a post-training assessment 9 months later in which fatigue and missed training likely affected the results.