There are 3 studies that match your criteria.
Criteria: Freq Range=300 kHz - 300 GHz (RF/mmW/THz),Study Type=In Vitro,Study Subtype=Signaling (Ca++/Ion Efflux, Neuron Conduction/channels, Muscle Contraction),Status=Ongoing

Details - Project ID 344
Lab	Univ Hannover, Hannover, FRG
Study Design	900, 1800 MHz (GSM), 2450 MHz exposure to cell lines and analysis of cell volume and growth and signaling
Summary	(ongoing)
Citation
Details - Project ID 1829
Lab	University Southern Denmark, Odense, Denmark
Study Design	900 Mhz (GSM) and 2 GHz (UMTS) exposure to rat hippocampal slices and analysis of viability and neuron conduction
Summary
Citation
Details - Project ID 2764
Lab	Shiraz U of Med Sciences, Shiraz, Iran
Study Design	In this study that was aimed at investigating the effects of exposure to radiofrequency (RF) radiation emitted by a GSM mobile phone on the pattern of contraction in frog's isolated gastrocnemius muscle after stimulation with single square pulses of 1V (1 Hz), pulse height of contractions, the time interval between two subsequent contractions and the latency period were measured.
Summary	Survey of the Effects of Exposure to 900 MHz Radiofrequency Radiation Emitted by a GSM Mobile Phone on the Pattern of Muscle Contractions in an Animal Model.
Citation	Mortazavi, SM et al. J Biomed Phys Eng., (2015) 5:121-132