Frequent sampling can reveal a detailed trajectory even in a very small physiological experiment. It does not make the participant sample large. Primary report
What was observed
Three healthy men received continuous kisspeptin-10 infusion over 24 hours. LH rose, reached its highest measured levels after many hours, and then declined before the infusion ended while remaining above baseline. FSH and testosterone increased more modestly. The report identifies registration NCT01438073. Primary report
Our appraisal: preserve each person's curve
An average curve can conceal different peak times and response sizes. With only a few participants, individual trajectories are especially important. Hundreds of samples from three people still provide only three independent participant histories for generalizing between people.
A decline during ongoing exposure is consistent with several physiological explanations. It does not alone establish receptor desensitization, because feedback, secretion dynamics, clearance, and measurement timing may also matter. The mechanistic interpretation should remain a hypothesis unless directly tested.
The observed maximum is also not necessarily a steady-state concentration. Calling it a plateau would imply a stability that the subsequent decline does not demonstrate. Sampling duration determines which part of the response is visible.
This is a physiological probe in healthy volunteers, not a study of long-term treatment effectiveness. Full review should inspect the protocol, related publications under the same registration, individual data, and safety observations. Its contribution is the dynamic pattern under continuous exposure. It does not establish an optimal regimen, predict fertility, or demonstrate sustained clinical benefit.
Frequently asked questions
How many participants were studied?
Three healthy men.
Did LH remain at its peak until the end?
No.
Are repeated samples independent participants?
No.
Does a decline prove receptor desensitization?
Not by itself.
Is a peak necessarily steady state?
No.
Was long-term clinical treatment tested?
No.
What is most informative here?
The within-person time course and its limits for broader inference.