The Experts below are selected from a list of 291 Experts worldwide ranked by ideXlab platform
T Jarchow - One of the best experts on this subject based on the ideXlab platform.
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Perceived Body Position and the visual horizontal.
Brain research bulletin, 1996Co-Authors: F Mast, T JarchowAbstract:This contribution examines the relation between the subjective visual vertical, the subjective visual horizontal, and the perceived Body Position of human subjects. Firmly fixed on a tiltable chair with head and torso restrained, 11 healthy subjects were rolled sideways and indicated their subjective horizontal Body Position. In these Positions the subjects were also asked to adjust a luminous line alternately to the vertical and to the horizontal. The adjustments of the subjective horizontal Body Position cluster around a mean of 96.3 degrees with a remarkably broad range (SD: 19.7 degrees). In the subjective horizontal Body Position, the luminous line does not appear horizontal when in line with one's own spinal axis. It is set further down by 27.4 degrees on average and, therefore, perpendicular to the subjective visual vertical. This finding supports the idea that the judgement of the own Body Position and the judgement of the orientation of a seen object respective to gravity are based on different references. Contradictory to other investigations [23,24], is the empirical fact that the individual subjects were not able to adjust the horizontal Body Position with the reported accuracy (range of mean adjustments 77.5 to 117.6 degrees).
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Perceived Body Position and the visual horizontal.
Brain Research Bulletin, 1996Co-Authors: Fred W. Mast, T JarchowAbstract:Abstract This contribution examines the relation between the subjective visual vertical, the subjective visual horizontal, and the perceived Body Position of human subjects. Firmly fixed on a tiltable chair with head and torso restrained, 11 healthy subjects were rolled sideways and indicated their subjective horizontal Body Position. In these Positions the subjects were also asked to adjust a luminous line alternately to the vertical and to the horizontal. The adjustments of the subjective horizontal Body Position cluster around a mean of 96.3° with a remarkably broad range (SD: 19.7°). In the subjective horizontal Body Position, the luminous line does not appear horizontal when in line with one's own spinal axis. It is set further down by 27.4° on average and, therefore, perpendicular to the subjective visual vertical. This finding supports the idea that the judgement of the own Body Position and the judgement of the orientation of a seen object respective to gravity are based on different references. Contradictory to other investigations [23, 24], is the empirical fact that the individual subjects were not able to adjust the horizontal Body Position with the reported accuracy (range of mean adjustments 77.5 to 117.6°).
Brian T Bateman - One of the best experts on this subject based on the ideXlab platform.
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elevated upper Body Position improves pregnancy related osa without impairing sleep quality or sleep architecture early after delivery
Chest, 2015Co-Authors: Sebastian Zaremba, Noomi Mueller, Anne M Heisig, Christina H Shin, Stefanie Jung, Lisa Leffert, Brian T BatemanAbstract:BACKGROUND During pregnancy, upper airway resistance is increased, predisposing vulnerable women to pregnancy-related OSA. Elevation of the upper Body increases upper airway cross-sectional area (CSA) and improves severity of OSA in a subgroup of nonpregnant patients (Positional-dependent sleep apnea). We tested the hypothesis that elevated Position of the upper Body improves OSA early after delivery. METHODS Following institutional review board approval, we conducted a randomized, crossover study on two postpartum units of Massachusetts General Hospital. Women during the first 48 h after delivery were included. Polysomnography was performed in nonelevated and 45° elevated upper Body Position. Upper airway CSA was measured by acoustic pharyngometry in nonelevated, 45° elevated, and sitting Body Position. RESULTS Fifty-five patients were enrolled, and measurements of airway CSA obtained. Thirty patients completed polysomnography in both Body Positions. Elevation of the upper Body significantly reduced apnea-hypopnea index (AHI) from 7.7 ± 2.2/h in nonelevated to 4.5 ± 1.4/h in 45° elevated upper Body Position (P = .031) during sleep. Moderate to severe OSA (AHI > 15/h) was diagnosed in 20% of postpartum patients and successfully treated by elevated Body Position in one-half of them. Total sleep time and sleep architecture were not affected by upper Body elevation. Change from nonelevated to sitting Position increased inspiratory upper airway CSA from 1.35 ± 0.1 cm 2 to 1.54 ± 0.1 cm 2 during wakefulness. Position-dependent increase in CSA and decrease in AHI were correlated ( r = 0.42, P = .022). CONCLUSIONS Among early postpartum women, 45° upper Body elevation increased upper airway CSA and mitigated sleep apnea. Elevated Body Position might improve respiratory safety in women early after delivery. TRIAL REGISTRY ClinicalTrials.gov ; No.: NCT01719224; URL: www.clinicaltrials.gov
Sebastian Zaremba - One of the best experts on this subject based on the ideXlab platform.
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elevated upper Body Position improves pregnancy related osa without impairing sleep quality or sleep architecture early after delivery
Chest, 2015Co-Authors: Sebastian Zaremba, Noomi Mueller, Anne M Heisig, Christina H Shin, Stefanie Jung, Lisa Leffert, Brian T BatemanAbstract:BACKGROUND During pregnancy, upper airway resistance is increased, predisposing vulnerable women to pregnancy-related OSA. Elevation of the upper Body increases upper airway cross-sectional area (CSA) and improves severity of OSA in a subgroup of nonpregnant patients (Positional-dependent sleep apnea). We tested the hypothesis that elevated Position of the upper Body improves OSA early after delivery. METHODS Following institutional review board approval, we conducted a randomized, crossover study on two postpartum units of Massachusetts General Hospital. Women during the first 48 h after delivery were included. Polysomnography was performed in nonelevated and 45° elevated upper Body Position. Upper airway CSA was measured by acoustic pharyngometry in nonelevated, 45° elevated, and sitting Body Position. RESULTS Fifty-five patients were enrolled, and measurements of airway CSA obtained. Thirty patients completed polysomnography in both Body Positions. Elevation of the upper Body significantly reduced apnea-hypopnea index (AHI) from 7.7 ± 2.2/h in nonelevated to 4.5 ± 1.4/h in 45° elevated upper Body Position (P = .031) during sleep. Moderate to severe OSA (AHI > 15/h) was diagnosed in 20% of postpartum patients and successfully treated by elevated Body Position in one-half of them. Total sleep time and sleep architecture were not affected by upper Body elevation. Change from nonelevated to sitting Position increased inspiratory upper airway CSA from 1.35 ± 0.1 cm 2 to 1.54 ± 0.1 cm 2 during wakefulness. Position-dependent increase in CSA and decrease in AHI were correlated ( r = 0.42, P = .022). CONCLUSIONS Among early postpartum women, 45° upper Body elevation increased upper airway CSA and mitigated sleep apnea. Elevated Body Position might improve respiratory safety in women early after delivery. TRIAL REGISTRY ClinicalTrials.gov ; No.: NCT01719224; URL: www.clinicaltrials.gov
Gulce Cakmak - One of the best experts on this subject based on the ideXlab platform.
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the effect of scanner type and scan Body Position on the accuracy of complete arch digital implant scans
Clinical Implant Dentistry and Related Research, 2020Co-Authors: Gulce Cakmak, Hakan Yilmaz, Alejandro Trevino, Ali Murat Kokat, Burak YilmazAbstract:BACKGROUND How the accuracy of complete-arch implant scans is affected when different intraoral scanners (IOSs) are used and the effect of scan Body Position on the accuracy are not well-known. PURPOSE To compare the scan accuracy (trueness and precision) of a recently introduced IOS (Virtuo Vivo) to a commonly used IOS (TRIOS 3) and the scans of a laboratory scanner (LBS; Cares 7 SERIES) in a completely edentulous maxilla with four implants. It was also aimed to evaluate the effect of scan Body Position on the accuracy. MATERIALS AND METHODS Multi-unit scan bodies were tightened on a poly(methyl methacrylate) edentulous maxillary model with four implants. A master reference model (MRM) stereolithography (STL) file was generated by scanning the model with a high-precision scanner. The model was scanned with three different scanners (n = 10); two different IOSs and a LBS. STL files were superimposed over the MRM. RESULTS For trueness, scan Body Position (P = .004) and scanner type (P < .001) had a significant effect on distance deviation and a significant interaction was found (P = .001). For angular deviation, only scanner type had a significant effect (P = .028). For precision, significant difference was found for distance (P = .011) and angular deviations (P = .020) between different scanner types. CONCLUSIONS One scanner type was not superior to others when both trueness and precision were considered. Position of the scan Body affected the distance deviation (trueness).
M. Dramaix - One of the best experts on this subject based on the ideXlab platform.
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Prone or Supine Body Position and Sleep Characteristics in Infants
Pediatrics, 1993Co-Authors: André Kahn, José Groswasser, Martine Sottiaux, Elisabeth Rebuffat, Patricia Franco, M. DramaixAbstract:Objective. To evaluate the potential relation between Body Position and sleep characteristics in normal infants. Patients. Two groups of 3-month-old healthy infants were evaluated: 40 infants who usually slept supine, and 40 who usually slept prone. The two groups were matched for gender, gestational age, postnatal age, birth weight, and total recording time. Recording techniques. The 80 infants were studied polygraphically during one night in the pediatric sleep laboratory. They were allowed to fall asleep in their usual sleep Position, and every 3 hours were gently turned from prone to supine, or from supine to prone. Results. In each group, 6 infants were excluded from the analysis, because they woke up after having been turned over. In both groups, no significant difference was seen between the prone and the supine Body Positions for the following variables: number of sleep state changes; number of gross Body movements; percent of rapid eye movement sleep; saturation with oxygen, arterial blood levels; number and duration of acid esophageal reflux; rectal temperature; mean respiratory rates; water evaporation rates from the forehead skin; and number or duration of central or of obstructive apneas. In both groups of infants, prone Body Position was associated with a significant increase in sleep duration (+ 6%) and in non-rapid eye movement sleep (+25%) and a significant decrease in number of arousals (–40%) and in their duration (–43%). Conclusions. No explanation has been found for the sleep-promoting effect of prone Body Positioning. The finding could be of interest to the study of infants9 sleep quality, as well as to the potential relation between Body Positions and sudden death during sleep.