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For the first time, we measured potential immediate effects of UMTS\u2010EMF in real\u2010time without any interference during exposure. Three different exposures (sham, 0.18\u2009W\/kg, and 1.8\u2009W\/kg) were applied in a controlled, randomized, crossover, and double\u2010blind paradigm on 16 healthy volunteers. In addition to oxy\u2010, deoxy\u2010, and total haemoglobin concentrations ([O<jats:sub>2<\/jats:sub>Hb], [HHb], and [tHb], respectively), the heart rate (HR), subjective well\u2010being, tiredness, and counting speed were recorded. During exposure to 0.18\u2009W\/kg, we found a significant short\u2010term increase in \u0394[O<jats:sub>2<\/jats:sub>Hb] and \u0394[tHb], which is small (\u224817%) compared to a functional brain activation. A significant decrease in the medium\u2010term response of \u0394[HHb] at 0.18 and 1.8\u2009W\/kg exposures was detected, which is in the range of physiological fluctuations. The medium\u2010term \u0394HR was significantly higher (+1.84\u2009bpm) at 1.8\u2009W\/kg than for sham exposure. The other parameters showed no significant effects. Our results suggest that intermittent exposure to UMTS\u2010EMF has small short\u2010 and medium\u2010term effects on cerebral blood circulation and HR. Bioelectromagnetics  33:40\u201354, 2012. \u00a9 2011 Wiley Periodicals, Inc.<\/jats:p>","DOI":"10.1002\/bem.20682","type":"journal-article","created":{"date-parts":[[2011,6,21]],"date-time":"2011-06-21T17:50:51Z","timestamp":1308678651000},"page":"40-54","source":"Crossref","is-referenced-by-count":14,"title":["Assessment of intermittent UMTS electromagnetic field effects on blood circulation in the human auditory region using a near\u2010infrared system"],"prefix":"10.1002","volume":"33","author":[{"given":"Sonja","family":"Spichtig","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Felix","family":"Scholkmann","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lydia","family":"Chin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hugo","family":"Lehmann","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Martin","family":"Wolf","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2011,6,21]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1038\/sj.jcbfm.9600279"},{"key":"e_1_2_7_3_1","unstructured":"AkaikeH.1973.Information theory and an extension of the maximum likelihood principle. 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