TENS might be useful for injury, although its not so well studied in humans yet.
Basics are still: strengthening exercises, stretching, massage, etc. unless you physically cannot do these things.
Other than pain an interesting application is nerve regrowth, which can take years or not happen at all:
Peripheral nerve injury typically occurs during road traffic accidents, industrial accidents, or injuries sustained at home. Despite recent advances in medical science, complete recovery after peripheral nerve injury is rare and injuries usually result in permanent partial loss of motor function, sensory function, or both. Gordon et al. described three main factors responsible for inadequate functional recovery: (1) slow growth of regenerating axons across the surgical coaptation sites and nerve gaps; (2) decline in the regenerative capacity of the axotomized neurons over time; and (3) the limited time window in which denervated Schwann cells can successfully contribute a regenerative milieu for regenerating axons. Post-injury motor and sensory deficit due to inadequate recovery can affect the quality of life. Therefore, development of methods to enhance axonal regeneration is a key imperative to facilitate complete recovery after peripheral nerve injuries.
Several studies have shown that direct electrical stimulation of the injured nerves can enhance sensory and motor axon regeneration, hasten functional recovery, and facilitate reinnervation [2, 5–11]. In a study by Mendonca et al., stimulation of injured peripheral nerves with continuous 1 μA electric current improved functional recovery significantly compared to control groups [5]. Alrashdan et al. observed that 30 minutes of low-intensity electrical stimulation promoted nerve regeneration after crush injury [6]. Furthermore, Koo et al. demonstrated that animals that received electrical stimulation for six days (1h per day) showed superior motor function as compared to those that received stimulation for shorter periods [7].
I checked the unit I have here:
Maximum Output Voltage 16V@500Ω ; 61V@2 kΩ ; 170V@10 kΩ (250V pk-pk @15kΩ measured)
Maximum Output Current 30mA @ 500Ω ; 28mA @ 2 kΩ ; 27mA @10 kΩ
Pulse Duration 120—680 µs
Similar waveform to what you measured, positive going pulse then negative going. Can't use even close to 50% power setting as its insanely uncomfortable at that level.
BTW the replacement conductive pads are very cheap on amazon, $10 for a set of 10 or so. If you end up liking it.
https://www.sciencedirect.com/science/article/abs/pii/S1526590011004445 https://www.sciencedirect.com/science/article/abs/pii/S1058274617303166https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5404801/https://pubmed.ncbi.nlm.nih.gov/19682653/https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0233531
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