| 1. |
|
|
| 2. |
- Arnetz, Bengt B., et al.
(författare)
-
The Effects of 884 MHz GSM Wireless Communication Signals on Self-reported Symptoms and Sleep : An Experimental Provocation Study
- 2007
-
Ingår i: PIERS online. - 1931-7360. ; 3:7, s. 1148-1150
-
Tidskriftsartikel (refereegranskat)abstract
- In the current study we assessed possible effects of prolonged (3 hours) exposure to 884 MHz GSM wireless communication signals on self-reported symptoms, cognitive function, and electroencephalographically (EEG) recorded sleep. The study group consisted of 36 women and 35 men. Twenty-two women and sixteen men reported symptoms they specifically related to mobile phone use (SG). The rest of the participants reported no mobile phone-related symptoms (NG). Potential participants volunteering for the study were evaluated by physicians, including some biochemical assessments, to rule out medical conditions that could interfere with study variables of interest. Once selected, participants spent three different sessions in the laboratory. The habituation session was followed by two subsequent sessions. In these subsequent sessions, subjects were either exposed to sham exposure (sham) or 884 MHz GSM wireless communication signals for 3 hours (an average of 1.4 W/kg including periods of DTX and Non-DTX. Exposure directed to the left hemisphere). Data was collected before, during and following the exposure/sham sessions. Data collected included self-reported symptoms, including headache, cognitive function, mood, and electroencephalographic recordings. During actual exposure, as compared to sham exposure, sleep initiated one hour after exposure was affected. There was a prolonged latency to reach the first cycle of deep sleep (stage 3). The amount of stage 4 sleep was also decreased in exposed subjects. NG subjects reported more headaches during exposures vs. sham exposure. Neither group (SG and NG) was able to detect the true exposure status more frequently than by chance alone. The study indicates that during laboratory exposure to 884 MHz wireless signals, components of sleep, believed to be important for recovery from daily wear and tear, are adversely affected. Moreover, participants that otherwise have no self-reported symptoms related to mobile phone use, appear to have more headaches during actual radiofrequency exposure as compared to sham exposure. However, subjects were not able to detect the true exposure status more often than would have been expected by statistical chance alone. Additional self-reported findings, biochemical, performance and electrophysiological data are currently being analyzed. Possible health implications from the findings will also be further explored.
|
|
| 3. |
- Hillert, Lena, et al.
(författare)
-
The effects of 884 MHz GSM wireless communication signals on headache and other symptoms : an experimental provocation study.
- 2008
-
Ingår i: Bioelectromagnetics. - : Wiley. - 1521-186X .- 0197-8462. ; 29:3, s. 185-96:Nov 28 [Epub ahead of print]
-
Tidskriftsartikel (refereegranskat)abstract
- The effects of 884 MHz GSM wireless communication signals on headache and other symptoms: an experimental provocation study.Hillert L, Akerstedt T, Lowden A, Wiholm C, Kuster N, Ebert S, Boutry C, Moffat SD, Berg M, Arnetz BB.Department of Public Health Sciences, Division of Occupational Medicine, Karolinska Institutet, Stockholm, Sweden. lena.hillert@ki.seFindings from prior studies of possible health and physiological effects from mobile phone use have been inconsistent. Exposure periods in provocation studies have been rather short and personal characteristics of the participants poorly defined. We studied the effect of radiofrequency field (RF) on self-reported symptoms and detection of fields after a prolonged exposure time and with a well defined study group including subjects reporting symptoms attributed to mobile phone use. The design was a double blind, cross-over provocation study testing a 3-h long GSM handset exposure versus sham. The study group was 71 subjects age 18-45, including 38 subjects reporting headache or vertigo in relation to mobile phone use (symptom group) and 33 non-symptomatic subjects. Symptoms were scored on a 7-point Likert scale before, after 1(1/2) and 2(3/4) h of exposure. Subjects reported their belief of actual exposure status. The results showed that headache was more commonly reported after RF exposure than sham, mainly due to an increase in the non-symptom group. Neither group could detect RF exposure better than by chance. A belief that the RF exposure had been active was associated with skin symptoms. The higher prevalence of headache in the non-symptom group towards the end of RF exposure justifies further investigation of possible physiological correlates. The current study indicates a need to better characterize study participants in mobile phone exposure studies and differences between symptom and non-symptom groups. (c) 2007 Wiley-Liss, Inc.
|
|
| 4. |
- Lowden, Arne, et al.
(författare)
-
Sleep after mobile phone exposure in subjects with mobile phone-related symptoms
- 2011
-
Ingår i: Bioelectromagnetics. - : Wiley. - 0197-8462 .- 1521-186X. ; 32:1, s. 4-14
-
Tidskriftsartikel (refereegranskat)abstract
- Several studies show increases in activity for certain frequency bands (10-14 Hz) and visually scored parameters during sleep after exposure to radiofrequency electromagnetic fields. A shortened REM latency has also been reported. We investigated the effects of a double-blind radiofrequency exposure (884 MHz, GSM signaling standard including non-DTX and DTX mode, time-averaged 10 g psSAR of 1.4 W/kg) on self-evaluated sleepiness and objective EEG measures during sleep. Forty-eight subjects (mean age 28 years) underwent 3 h of controlled exposure (7:30-10:30 PM; active or sham) prior to sleep, followed by a full-night polysomnographic recording in a sleep laboratory. The results demonstrated that following exposure, time in Stages 3 and 4 sleep (SWS, slow-wave sleep) decreased by 9.5 min (12%) out of a total of 78.6 min, and time in Stage 2 sleep increased by 8.3 min (4%) out of a total of 196.3 min compared to sham. The latency to Stage 3 sleep was also prolonged by 4.8 min after exposure. Power density analysis indicated an enhanced activation in the frequency ranges 0.5-1.5 and 5.75-10.5 Hz during the first 30 min of Stage 2 sleep, with 7.5-11.75 Hz being elevated within the first hour of Stage 2 sleep, and bands 4.75-8.25 Hz elevated during the second hour of Stage 2 sleep. No pronounced power changes were observed in SWS or for the third hour of scored Stage 2 sleep. No differences were found between controls and subjects with prior complaints of mobile phone-related symptoms. The results confirm previous findings that RF exposure increased the EEG alpha range in the sleep EEG, and indicated moderate impairment of SWS. Furthermore, reported differences in sensitivity to mobile phone use were not reflected in sleep parameters.
|
|
| 5. |
- Lumley, Mark A., et al.
(författare)
-
The Relationship of Chronic and Momentary Work Stress to Cardiac Reactivity in Female Managers : Feasibility of a Smart Phone-Assisted Assessment System
- 2014
-
Ingår i: Psychosomatic Medicine. - : Lippincott Williams & Wilkins. - 0033-3174 .- 1534-7796. ; 76:7, s. 512-518
-
Tidskriftsartikel (refereegranskat)abstract
- Objectives: To evaluate a wireless smart phone-assisted (SPA) system that assesses ongoing heart rate (HR) and HR-triggered participant reports of momentary stress when HR is elevated during daily life. This SPA system was used to determine the independent and interactive roles of chronic and momentary work stress on HR reactivity among female managers. Methods: A sample of 40 female managers reported their chronic work stress and wore the SPA system during a regular workday. They provided multiple reports of their momentary stress, both when triggered by increased HR and at random times. Relationships among chronic stress, momentary stress, and HR were analyzed with hierarchical linear modeling. Results: Both chronic work stress (b = 0.08, standard error [SE] = 0.03, p = .003) and momentary work stress (b = 1.25, SE = 0.62, p = .052) independently predicted greater HR reactivity, adjusting for baseline HR, age, smoking, caffeine, alcohol use, and momentary physical activity levels. More importantly, chronic and momentary stress significantly interacted (b = 1.00, SE = 0.04, p = .036); high momentary stress predicted elevated HR only in the context of high chronic stress. Conclusions: Female managers who experience chronic work stress displayed elevated cardiac reactivity during momentary stress at work. The joint assessment of chronic stress and momentary stress and their relationship to physiological functioning during work clarifies the potential health risks associated with work stress. Moreover, this wireless SPA system captures the immediate subjective context of individuals when physiological arousal occurs, which may lead to tailored stress management programs in the workplace.
|
|
| 6. |
|
|
| 7. |
- Sha, K, et al.
(författare)
-
SPA : a smart phone assisted chronic illness self-management system with participatory sensing
- 2008
-
Konferensbidrag (refereegranskat)abstract
- The medical system has not been able to effectively adaptto the dramatic transformation in public health challenges,from acute to chronic and lifestyle-related illnesses. Althoughacute illnesses can be treated successfully in an officeor hospital, chronic illnesses comprise the bulk of healthcare needs and require a very different approach. Patient involvementis critical for sustainable and successful chronicdisease management. Regular feed-back of relevant healthdata to the individual patient facilitates patient involvement.Yet, there is a lack of effective and easily deployed tools forself-monitoring and self-care, and people often do these taskspoorly, especially people at socioeconomic risk for chronicillness, such as urban minorities. Based on the most currentcognitive and behavioral change research, we proposethat the prevention or treatment of chronic illnesses will begreatly aided by an innovative system that can monitor aperson’s body, behavior, and environment during his or herdaily life, and then alert the person to take corrective actionwhen health risks are identified. In this paper, we proposea smart phone assisted chronic illness self-management system,named SPA. Our system can provide continuous monitoringon the health condition of the system user and givevaluable in-situ context-aware suggestions/feedbacks to improvethe public health.
|
|
| 8. |
- Wiholm, Clairy, 1946-
(författare)
-
Advanced Knowledge Work and Stress-related Symptoms : Epidemiology and Clinical Intervention Studies
- 2006
-
Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Well educated knowledge workers are a growing group of the work force. Little research has been conducted on this group regarding possible work-related health symptoms, as well as interventions in order to reduce work-related stress. This thesis describes the current work-related symptoms and potential risk and salutogenic, i.e. protective factors, associated with these symptoms among software and system designers in a high tech company in Sweden. A stress management intervention program was launched in order to evaluate whether work-related stress might be a risk factors for these symptoms. It was also of interest to study the potential impact of stress management interventions on psychosocial work organizational factors. The thesis is based on cross sectional and longitudinal data. Paper I is focusing on risk factors for musculoskeletal symptoms and headaches, and their possible association with biological markers and self-reported physical and psychosocial work environmental factors. Paper II assessed the association between occupational psychosocial factors and psychosomatic symptoms i.e. mental fatigue, headache, restlessness, irritation, moodiness and difficulty concentrating. Paper III and IV evaluated the effects of a stress management program including three different stress reducing strategies, on musculoskeletal and skin symptoms as well as headaches, and on the perceived psychosocial work environment. The overall results indicate that psychosocial factors via stress sensitive hormones have an impact on employee health in a high technological work environment. Furthermore, stress management interventions, conducted as relaxation and mental training, had short-term favorable effects on some musculoskeletal and skin symptoms. It seems that competence and competence utilization among advanced knowledge workers are psychosocial work environmental factors that need to be take into consideration in future health preventive ventures.
|
|
| 9. |
- Wiholm, Clairy, et al.
(författare)
-
Associations between eyestrain and neck-shoulder symptoms among call centre operators
- 2007
-
Ingår i: Scandinavian Journal of Work, Environment & Health. - 0356-6528. ; :Suppl. 3, s. 54-59
-
Tidskriftsartikel (refereegranskat)abstract
- Few if any studies have investigated if eyestrain and shoulder-neck symptoms are correlated, although functional links could be expected on the basis of neurophysiological evidence. The present cross sectional study assessed correlations between self-reported eye strain and shoulder-neck symptoms among call centre workers, controlling for possible confounders for these ailments. A questionnaire concerning socioeconomic background, work conditions and symptoms was mailed to 1531 employees at 28 different call centers during the years 2001- 2003. Twenty-one percent of responding subjects (N = 1162) reported both eyestrain and neck shoulder symptoms, 46% reported neck/shoulder and 6 % eye symptoms. 46% were free from symptoms in these regions. A significant positive association was found between eyestrain and neck/shoulder symptoms. Significant covariates for shoulder-neck disorders were eyestrain (OR = 1.6 p = 0.007), gender (to be female) (OR 1.9, p < 0.001, irritation index (OR 1.2, p =0.03), and feeling stressed (OR 1.2, p = 0.001. In a multi-nominal regression analysis gender (female) (OR = 1.9, p = 0.002), feeling stressed (OR 1.3, p = 0.002), feelings of distress (OR = 1.7, p < 0.001), computer problems (OR 1.3, p = 0.002)) and social support (OR 0.6, p = 0.003) remained in the model for the eye/neck symptoms. The results from this study support an association between self-reported combined eyestrain and shoulder-neck symptoms. However no causal relations can be derived due to the cross-sectional design.
|
|
| 10. |
- Wiholm, Clairy, et al.
(författare)
-
Mobile phone exposure and spatial memory.
- 2009
-
Ingår i: Bioelectromagnetics. - : Wiley. - 1521-186X .- 0197-8462. ; 30:1, s. 59-65
-
Tidskriftsartikel (refereegranskat)abstract
- Radiofrequency (RF) emission during mobile phone use has been suggested to impair cognitive functions, that is, working memory. This study investigated the effects of a 2 1/2 h RF exposure (884 MHz) on spatial memory and learning, using a double-blind repeated measures design. The exposure was designed to mimic that experienced during a real-life mobile phone conversation. The design maximized the exposure to the left hemisphere. The average exposure was peak spatial specific absorption rate (psSAR10g) of 1.4 W/kg. The primary outcome measure was a "virtual" spatial navigation task modeled after the commonly used and validated Morris Water Maze. The distance traveled on each trial and the amount of improvement across trials (i.e., learning) were used as dependent variables. The participants were daily mobile phone users, with and without symptoms attributed to regular mobile phone use. Results revealed a main effect of RF exposure and a significant RF exposure by group effect on distance traveled during the trials. The symptomatic group improved their performance during RF exposure while there was no such effect in the non-symptomatic group. Until this new finding is further investigated, we can only speculate about the cause.
|
|
