The effect widens by 5 hours
The gap between treated and placebo patients grew over the first hours — roughly a threefold difference by hour five.
The finding
Rather than wearing off, the difference between the active and sham groups widened over the first several hours: by around five hours, the reduction in mean pain favoring the treated group was roughly threefold — the basis for the "300%" figure shown on the site, expressed as the relative size of the gap versus placebo.
Why a sustained effect matters
Many comfort measures help briefly and then fade, leaving the patient back on the call button. An effect that holds — and grows — across the first hours is what actually reduces cumulative narcotic dosing over a recovery, not just the first dose. It is the difference between a moment of relief and a changed recovery curve.
The study design
The widening gap between Rhode 2010's active and sham groups at five hours reflects the cumulative effect of repeated tPEMF pulses across that window — each session re-triggering the nitric-oxide cascade rather than the effect simply persisting from a single dose. The sham group's pain trajectory followed a typical post-surgical decline with a slower slope; the active group's trajectory was steeper and did not exhibit a rebound. Both groups continued receiving standard rescue analgesics throughout, which makes the sustained difference — on top of equivalent pharmacologic access — more clinically meaningful.
What this means in practice
For a patient recovering from surgery, five hours is the arc from waking in recovery to the first evening at home or on the ward. An effect that not only holds but grows over that span means the patient is more comfortable at every point in that window — less likely to request rescue medication at hour two, and even less likely at hour five. The cumulative narcotic reduction over the first two days (documented separately at 2.2×) is the downstream consequence of an effect that sustained and grew rather than rebounded.
Compared to the standard alternative
Short-acting opioids peak at 30–60 minutes and lose half their effect by 2–4 hours, requiring re-dosing to maintain analgesia. NSAIDs have a flatter but limited ceiling. The tPEMF effect shows the opposite trajectory — strengthening over five hours — which reflects an accumulating biological response rather than a pharmacokinetic peak-and-trough. This trajectory is one of the hallmarks of a mechanism-driven effect rather than a symptomatic one.
Sources
- Rhode C, et al. Plast Reconstr Surg. 2010 — pain trajectory over first hours
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