The physiological and psychological relaxing effects of viewing rose flowers in office workers
© Ikei et al.; licensee BioMed Central Ltd. 2014
Received: 6 December 2013
Accepted: 21 February 2014
Published: 8 March 2014
In recent years, the physiological relaxing effect brought by nature is becoming clear; however, many workers find it difficult to be exposed to nature in their working environment. Exposure to fresh flowers represents an opportunity to incorporate nature into their working lives. In this study, we examined the effects of exposure to roses on physiological and psychological variables (heart rate variability, pulse rate, and subjective responses) in office workers.
The experimental site was Mizuho Information & Research Institute, Inc., in the Tokyo metropolitan area. Thirty-one male office workers were included in the present study. The subjects were exposed to thirty unscented pink roses (Rosa, Dekora) arranged in a cylindrical glass vase for 4 min. In the control condition, the subjects were not exposed to flowers. After the experiments, the subjects completed a questionnaire. The order of exposure was counterbalanced among subjects. Among subjects exposed to roses, the high-frequency component of heart rate variability was significantly higher than in controls. Similarly, 'comfortable,’ 'relaxed’ and 'natural’ feelings were more common in subjects exposed to roses.
Data from this study support the presence of physiological and psychological relaxing effects of being exposed to flowers on office workers.
KeywordsFresh rose flowers Office workers Visual stimuli Heart rate variability Pulse rate
Ever increasing urbanization and job pressures have resulted in an overly stressed society far removed from potential calming effects of nature. The disconnect between this state of permanent urban stress and our evolutionary history in the natural world was encapsulated by Miyazaki et al.: "We have become the humans we are today, living in a modern civilization, through a process of evolution that took place in a natural environment. The human body is thus made to adapt to nature. However, as conveyed through terms such as ‘techno-stress’, artificialisation is taking place at such a rapid rate that we now find ourselves in stressful situations in our daily lives and are forced to deal with the resultant pressures". We hypothesise that modern people in stressful states can be relaxed through contact with nature.
In our stressful modern societies, the relaxing effect of natural stimuli is considered advantageous compared with other stimuli. Many people are thus attracted to the physiological and psychological relaxing effect of exposure to nature. Field experiments on forest bathing[2–10], urban parks and rooftop gardens have demonstrated physiological relaxing effects of contact with nature. Furthermore, Li et al. reported forest bathing increased natural killer cell function and improved immune function. This effect was sustained for approximately 1 month. The results of these studies suggest that contact with nature is a type of prophylaxis.
Globally, evidence-based medicine has been attracting attention, with physiological data from field tests offering great value. We expect that accumulating physiological data from field experiments will continue to demonstrate preventive medical effects of nature therapy in the future[1, 14].
In modern society, many people spend the majority of their time in intensely stressful states, and have no time for contact with nature outside of their immediate surroundings. Office workers who work in urban areas are typical examples. Previous studies have evaluated the psychological stress levels among office workers, and they have shown that stressors at work not only cause psychological symptoms but also increase risk of cardiovascular disease and conditions such as insomnia. Moreover, data reported by the National Police Agency indicate that work problems were responsible for 8.2% cases of suicide in Japan in 2010. Therefore, because many office workers work in highly stressful environments, it might be argued that alleviating this situation is matter of urgency. However, most previous studies[2–10] had male college students as subjects, and there are few studies of office workers aged 20 to 50 years.
Flower arrangements are familiar to many people as bringing nature into daily life and offer office workers easy contact with nature within the constraints of time and space. In the Japanese flower market, chrysanthemum is the most popular flower type, with the most popular flowers being carnations and roses. Because chrysanthemums are usually laid for the deceased, roses are one of the most preferred flowers in Japan. The relaxing effects of fresh flowers such as roses are empirically known. There are many studies of psychological effects of exposure to flowers, but none have objectively studied the physiological effects of such exposure. We propose that flower arrangements may contribute to improving the stress in daily life from the viewpoint of preventive medicine. The aim of this research is to clarify the physiological and psychological relaxing effects of exposure to rose flowers on male office workers experiencing high levels of stress.
The experiments were conducted in a conference room of the Mizuho Information & Research Institute, Inc. The room temperature was maintained at 24.6°C ± 1.8°C (control room, 25.2°C ± 0.7°C) and relative humidity was maintained at 31.6% ± 3.9% (control room, 29.7% ± 1.8%). Thirty-one male workers (37.3 ± 2.0 years old) working in the institute were included. The study was conducted with the approval of the Ethics Committee of the Center for Environment, Health and Field Sciences, Chiba University and all subjects provided written informed consent.
We explained the experimental protocol to subjects in the waiting room, after which they received 4 minutes of viewing roses. The control group was not exposed to flowers in another room. After the experiments, subjects filled a questionnaire. The order of stimuli was counterbalanced among subjects.
For psychological evaluations, we employed a 13-point rating scale including the following parameters: ‘comfortable-uncomfortable’, ‘relaxed-awakening’ and ‘natural-artificial’ along with the factors in the profile of mood states (POMS) questionnaire. The POMS questionnaire simultaneously evaluates six measures of mood: tension-anxiety (T-A), depression-dejection (D), anger-hostility (A-H), fatigue (F), confusion (C), and vigor (V). In this study, were used the Japanese version of POMS[22–24] consisting of 30 items.
The Statistical Package for Social Sciences software (v20.0, SPSS Inc., Chicago, IL, USA) was used for all statistical analyses. Statistical analysis of physiological data was performed using the paired t-test after calculating the average values obtained during the 4-minute viewing of the roses versus those obtained during the control condition. Psychological evaluation was analyzed by the Wilcoxon signed-rank test. Statistical differences were considered significant at P <0.05.
Results and discussion
In the present study, we evaluated changes in autonomic nervous system activity, a physiological measure of stress, in office workers while viewing common fresh roses. A relatively brief (4-minute) viewing session resulted in significantly increased parasympathetic nervous activity, concordant with several previous studies demonstrating enhanced parasympathetic activity while viewing a forest scene[2, 3, 6, 7, 9]. Furthermore, this result is consistent with our previous report demonstrating calming effects of roses in middle-aged and elderly medical staff and in high-school students.
Numerous studies have evaluated effects of contact with familiar natural environments on human physiology and emotions. Indoor plants and the view from the window are good examples of the contact with nature obtainable while inside a room, and positive results of their physiological and psychological effects have been demonstrated[27–31]. In the previous studies, it is reported that natural views from hospital rooms or indoor plants hasten recovery of patients after surgery and decrease systolic blood pressure[27–29]. Those effects in an office location have been studied, showing greater work efficiency and job satisfaction simply by placing indoor plants in the office[30, 31]. Furthermore, the higher the stress state, the more effective the nature therapy.
Our research showed that parasympathetic nervous activity was enhanced by viewing roses. Therefore, by simple stimulus, roses possibly offer preventive medical effects by decreasing stress. Elucidation of the interaction of humans with the natural environment is an important issue in physiological anthropology. The results of this study may have important implications in the work place and for the health of office workers.
This study had a few limitations. First, only male subjects were included, and only roses were viewed. In future experiments, we will examine the responses of female subjects exposed to multiple types of flowers. We predict that the physiological data will support the physiological and psychological relaxing effects of exposure to roses, which may consequently lead to the increased use of flowers to reduce office-related stress. Second, we only evaluated HRV; therefore, this study cannot be considered to be a complete physiological evaluation. Other experimental indices, such as brain activity and stress hormone levels, should be assessed to determine the effects of visual stimulation such as viewing roses on responses in humans.
Parasympathetic nervous activity was enhanced by viewing roses. This finding suggests a simple method for decreasing stress and improving the health of office workers.
heart rate variability
profile of mood states
This work was supported by a grant from the Policy Research Institute, Ministry of Agriculture, Forestry and Fisheries (Extramural Research Program for Agricultural, Forestry and Fishery Policy Research). In addition, we appreciate the help of Kimiko Ishikawa (Senior Executive Advisor of the Japan Florists’ Telegraph Delivery Association) for assistance in the selection and arrangement of fresh roses.
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