[Development of the circadian rhythm of motor activity in the mouse]

The evolutions of the total motor activity (TMA) and the power content of circadian harmonic (PCCH), through time, have been studied in six male mice, during 57 days from weaning. The best correlation between TMA and time is a hyperbolic function, reaching 75% of the asymptotic value when the animals are 24-25 days old. PCCH values have been adjusted to a hyperbola, reaching 75% of the asymptote when the animals are 30-34 days old.