The activity of four selected beetles with two equal daily activity peaks was monitored in continuous darkness before, during and after flight (from L- 10 days until R+14 days). Although there was a ground reference experiment included, the internal control was more essential: the beetles were successively exposed to 1g, 0g, and 1g. In the absence of a 1g on-board centrifuge, the experiment did not discriminate between weightlessness and other spaceflight factors like launch effects and landing shocks .The four beetles were individually housed in four turning wheels. In the four turning wheels the locomotor activity of beetles was translated into electrical signals, which were continually recorded by two ACR data loggers (one data point per 10 min).
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A.M. Alpatov, W.J. Rietveld, L.B. Oryntaeva, (1994), "Impact of microgravity and hypergravity on free-running circadian rhythm of the desert beetle Trigonoscelis gigas Reitt", Biological Rhythm Research, Vol. 25, No. 2, pp. 168-177.