The effects of Lavender and Chamomile essential oil inhalation aromatherapy on depression, anxiety and stress in older community-dwelling people: A randomized controlled trial

A review on essential oils: A potential tonic for mental wellbeing in the aging population?

Mental wellbeing is crucial to a good quality of life. With progression in life, mental health can deteriorate, leading to multiple disorders, such as depression, anxiety, stress, and insomnia. Essential oils, from various sources, have a long history of use in aromatherapy. Herein, we review the current literature related to the psychological effects of essential oils, emphasizing their impact on mood regulation, stress reduction, sleep disturbances, and cognitive function. Various mechanisms, such as alterations to the neurotransmitter system, endocrine changes, and anti-oxidant activity are reviewed. The non-invasive nature of essential oils suggests they have a promising role as adjuncts to conventional therapies for improving the mental health of the aging population.

Aromatherapy was used to explore the sedative and hypnotic effects of Moringa seed essential oil on insomnia rats

Moringa is a type of plant that is used both for medicinal and food. Moringa seed (MS) are rich in volatile oil and have initially been employed to treat diseases of the nervous system. Insomnia, a prevalent neurological disorder, has led to this study's aim: to extract the essential oil from MS and analyze its potential to improve sleep. This study utilized petroleum ether for the thermal extraction of the essential oil from MS, which was then subjected to compositional analysis using Gas Chromatograph Mass Spectrometer (GC-MS). P-chlorophenyl alanine (PCPA) was used to induce an insomnia model in Sprague-Dawley (SD) rats. Following the successful establishment of the model, the MS essential oil was administered at concentrations of 10%, 5%, and 2.5% to investigate its sedative and hypnotic effects. The efficacy of the MS essential oil was assessed by observing the general condition of rats in each group, conducting an open field test, a pentobarbital sodium righting test, and measuring the serum 5-HT (5-hydroxytryptamine) levels and hypothalamic GABA (γ-aminobutyric acid) content. GC-MS analysis of the MS essential oil revealed a rich composition, including oleic acid, palmitoleic acid, stigmasterol, and γ-stigmasterol, among other substances. Through the assessment of the rats' general condition, behavioral tests, and blood biochemical assays, it was inferred that MS essential oil aromatherapy can reduce the rat's locomotor activity, increase their interest in activity and exploration, enhance the serum 5-HT levels, and elevate hypothalamic GABA content. Consequently, it can be concluded that MS essential oil has a sedative and hypnotic effect.

Influence of odor environments on cognitive efficiency: A comprehensive review

Cognitive efficiency, characterized by the rapid and accurate processing of information, significantly enhances work and learning outcomes. This efficiency manifests in improved time management, decision-making, learning capabilities, and creativity. While the influence of thermal, acoustic, and lighting conditions on cognitive performance has been extensively studied, the role of olfactory stimuli remains underexplored. Olfactory perception, distinguished by its intensity, speed of perception, and the breadth of stimuli, plays a pivotal role in cognitive efficiency. This review investigates the mechanisms through which odor environments influence cognitive performance. We analyze how odor environments can affect cognitive efficiency through two different scenarios (work and sleep) and pathways (direct and indirect effects). Current research, which mainly focuses on the interplay between odors, emotional responses, and cognitive efficiency through both subjective and objective measures, is thoroughly analyzed. We highlight existing research gaps and suggest future directions for investigating the influence of odor environments on cognitive efficiency. This review aims to establish a theoretical basis for managing and leveraging odor environments in workplace settings.

The effect of lavender and rosemary aromatherapy application on cognitive functions, anxiety, and sleep quality in the elderly with diabetes

OBJECTIVE

This study aimed to determine the effects of aromatherapy use on cognitive function, anxiety, and sleep quality in the elderly with diabetes.

METHODS

The study was conducted with 63 participants aged 65 and over. Participants were randomly divided into three groups: lavender, rosemary and control groups. The intervention continued for four weeks. Data was collected using the Blessed Orientation Concentration Test, State-Trait Anxiety Scale, and Pittsburgh Sleep Quality Scale. Data were analyzed using One-Way ANOVA, Mann-Whitney U/Kruskal-Wallis, Wilcoxon and Friedman tests.

RESULTS

In both intervention groups, the 4th week scores of cognitive functions, anxiety, and sleep quality after aromatherapy were significant compared to the baseline scores. In the control group, state anxiety scores were significantly higher in the 2nd and 4th weeks compared to the initial scores.

CONCLUSIONS

Inhaling lavender and rosemary has been observed to improve cognitive function and sleep quality and reduce anxiety levels. The effects of the essential oils used in the research were evaluated over four weeks. It is thought that studying for a longer period and with more samples would be beneficial. There is a need for studies examining its effects, especially in the elderly with diabetes.

The effect of aromatherapy on patients with acute coronary syndrome: A systematic review and meta-analysis

OBJECTIVE

To systematically investigate the efficacy of aromatherapy in patients with acute coronary syndrome (ACS).

METHODS

We conducted a comprehensive search for papers published until November 2023 using the following databases: PubMed, Embase, and Cochrane Library. This study was conducted following the PRISMA and Cochrane Guidelines. The inclusion criteria were randomized controlled trials (RCTs) performed to assess the comparative effectiveness of inhalation aromatherapy versus controls in individuals diagnosed with ACS. The Jadad rating method was used to assess the quality of the included studies, and a meta-analysis was performed using the RevMan 5.4 software. Heterogeneity was quantified using the Higgins I2 (%) test.

RESULTS

A total of 12 RCTs with 476 patients with ACS were included. Aromatherapy has been shown to reduce anxiety scores significantly (standard mean difference [SMD]: -1.18, 95 % confidence interval [CI]: -1.33 to -1.03; P < 0.00001) along with reduction in systolic blood pressure (MD = -8.78, 95 % CI [-13.92, -3.65], P = 0.008); diastolic blood pressure (MD = -7.76, 95 % CI [-11.39, -4.12], P < 0.001); mean artery pressure MD = -9.68, 95 % CI [-13.93.-5.44]; P < 0.0001). However, no significant effects were reported on the heart rate (MD = -6.98, 95 % CI [-15.46, 1.50], P = 0.11) and respiratory rate (MD = -0.67, 95 % CI [-2.52, 1.19], P = 0.48). A greater frequency of aromatherapy was associated greater anxiety -1.80 incidence, with 95 % CI [-2.04, -1.56]. Citrus essential oils exhibited the strongest effect (SMD = -1.97, 95 % CI [-3.34, -0.60], P = 0.005) in reducing anxiety levels.

CONCLUSION

Aromatherapy appears to be an effective non-pharmacological intervention for reducing blood pressure and anxiety in individuals with ACS. This suggests that aromatherapy more than twice a day is effective in reducing anxiety levels. However, aromatherapy had no statistically significant impact on the heart or respiratory rates. Moreover, additional high-quality RCTs should be conducted to verify these results and explore the efficacy and mechanism of aromatherapy in patients with ACS.

Effect of neroli-flavored chewing gum on anxiety

The aim of this study was to assess the effectiveness of neroli-flavored chewing gum in reducing anxiety. A single-blind, two-group study was conducted on 72 university students. Participants were randomly assigned to either the commercial neroli-flavored chewing gum (CNC) group or the natural hydro-distilled neroli-flavored chewing gum (NNC) group. The research instrument used was Spielberger's State-Anxiety questionnaire. While there was no significant difference in anxiety scores between the CNC and NNC groups before the intervention, a significant difference was observed in anxiety scores 20 min after the intervention. Within-group comparisons indicated statistically significant differences between pre-test and post-test values of anxiety in the NNC group. The results of this study suggest that natural hydro-distilled neroli-flavored chewing gum can reduce anxiety in university students.

Comparison of the Effects of Aromatherapy With Damask Rose and Chamomile Essential Oil on Preoperative Pain and Anxiety in Emergency Orthopedic Surgery: A Randomized Controlled Trial

PURPOSE

Patients who are awaiting emergency surgery experience high levels of anxiety and pain. This study aimed to compare the effects of aromatherapy with damask rose and chamomile essential oil on the preoperative pain and anxiety associated with emergency orthopedic surgery.

DESIGN

A parallel-group randomized controlled design was used.

METHODS

Ninety participants were selected and randomly assigned to three groups: the damask rose group (n = 30), the chamomile group (n = 30), and the control group (n = 30). In the damask rose and chamomile groups, three drops of 40% essential of each plant were used for inhalation aromatherapy (three drops every hour for 3 hours) Visual Analog Scales were used to evaluate participants' pain and anxiety levels at baseline, immediately after the intervention, and 1 hour after the intervention.

FINDINGS

The results of repeated measures Analysis of Variance (ANOVA) showed that both of the intervention groups experienced a decrease in pain and anxiety over time compared to the control group (P < .001). ANOVA results showed that immediately after the intervention, the anxiety level of the damask rose group compared to the chamomile and control groups was significantly lower (P = .01). However, there was no significant difference in terms of anxiety between the damask rose and chamomile groups 1 hour after the intervention (P = .07).

CONCLUSIONS

The use of damask rose and chamomile in aromatherapy was found to effectively lower anxiety and pain levels in emergency orthopedic surgery patients. The antianxiety effect of damask rose is faster than chamomile.

Lavender essential oil alleviates depressive-like behavior in alcohol-withdrawn rats: Insights from gut metabolites and hippocampal transcriptome analysis

Lavender, an aromatic plant with a history dating back to ancient Egypt and Greece, is consumed because of its diverse pharmacological properties, including sedation, sleep aid, and antidepressant effects. However, the mechanisms underlying these antidepressant properties remain unclear. In this study, we explored the impact of lavender essential oil (LEO) inhalation on the diversity of gut microbiota, metabolites, and differential gene expression in the hippocampus of alcohol-withdrawn depressive rats. Additionally, we examined alterations in the hippocampal transient receptor potential (TRP) channel-mediated inflammatory regulation within the brain-gut axis of depressive rats. The results demonstrated a significant decrease in sucrose preference, diminished activity in the central zone of the open field test, and prolonged immobility time in the forced swim test in alcohol-withdrawn depressive rats, indicating the amelioration of depressive states following lavender essential oil inhalation. 16 S rDNA sequencing analysis revealed a significant reduction in Bacteroidota and Muribaculaceae in the gut of alcohol-withdrawn depressive rats, whereas lavender essential oil significantly increased the relative abundance of Muribaculaceae and other bacterial species. Metabolomic analysis identified 646 distinct metabolites as highly correlated biomarkers between the model and lavender essential oil groups. Furthermore, lavender essential oil inhalation significantly attenuated hippocampal inflammatory factors IL-2, IL-6, IL-1β, and TNF-α. This study identified elevated expression of Trpv4 and Calml4 in the hippocampal region of alcohol-withdrawn depressed rats and showed that lavender essential oil inhalation regulated aberrantly expressed genes. Our research suggests that lavender essential oil downregulates Trpv4, modulates inflammatory factors, and alleviates depressive-like behavior in alcohol withdrawal rats.

Flower Power: An Overview on Chemistry and Biological Impact of Selected Essential Oils from Blossoms

Natural raw materials such as essential oils have received more and more attention in recent decades, whether in the food industry, as flavorings and preservatives, or as insecticides and insect repellents. They are, furthermore, very popular as fragrances in perfumes, cosmetics, and household products. In addition, aromatherapy is widely used to complement conventional medicine. This review summarizes investigations on the chemical composition and the most important biological impacts of essential oils and volatile compounds extracted from selected aromatic blossoms, including Lavandula angustifolia, Matricaria recutita, Rosa x damascena, Jasminum grandiflorum, Citrus x aurantium, Cananga odorata, and Michelia alba. The literature was collected from PubMed, Google Scholar, and Science Direct. Blossom essential oils discussed in this work are used in a wide variety of clinical issues. The application is consistently described as safe in studies and meta-analyses, although there are notes that using essential oils can also have side effects, especially dermatologically. However, it can be considered as confirmed that essential oils have positive influences on humans and can improve quality of life in patients with psychiatric disorders, critically ill patients, and patients in other exceptional situations. Although the positive effect of essential oils from blossoms has repeatedly been reported, evidence-based clinical investigations are still underrepresented, and the need for research is demanded.

Can environmental nebulization of lavender essential oil (L. angustifolia) improve welfare and modulate nasal microbiota of growing pigs?

The use of phytoextracts has been proposed as a method to improve animal welfare, also in pigs, by reducing stress and anxiety and improving performances. Lavandula angustifolia (Miller) essential oil (LaEO) is an interesting calming phytoextract that could be administered by inhalation for prolonged periods of time to help pigs coping with on-farm conditions. The aim of this study was to assess the effects of daily inhalation of vaporized LaEO on pigs' welfare and health indicators, and nasal microbiota, trying to understand whether this phytoextract represents a feasible tool to improve animal welfare under intensive farming conditions. Eighty-four crossbred barrows were randomly divided into 3 experimental groups: control (C); lavender (L): 3 vaporization sessions of 10 min each of a custom made 1% solution of LaEO; sham (S): same vaporization sessions of L group but only using the solution vehicle. Experimental readouts included growth parameters, behavioural traits, tail and skin lesions, hair steroids and nasal microbiota. L group animals did not show altered growth performance and seemed calmer (increased recumbency time), with decreased amount of skin lesions also associated with lower severity class for tail lesions. They also showed decreased CORT/DHEA ratio, potentially suggesting a beneficial effect of LaEO. Inhalation of LaEO significantly affected the nasal pig microbiome by reducing its diversity. Overall, the study suggests how inhalation of Lavender essential oil may be capable of improving welfare in growing pigs, yet it is pivotal to consider the microbial modulatory capabilities of essential oils before exploiting them on larger scale.

The Effect of Aromatherapy with Lavender Essential Oil on the Sleep and Fatigue Level of Patients with Multiple Sclerosis in Turkey: A Randomized Controlled Trial

BACKGROUND

Fatigue is a common problem in patients with multiple sclerosis (MS) and is one of the most serious symptoms of the disease. Although many factors play a role in the etiology of fatigue in patients with MS, it has been reported that fatigue is caused by irregular or disrupted sleep patterns.

AIM

The purpose of the study was to examine the effects of lavender oil aromatherapy on the sleep and fatigue of MS patients.

METHODS

The study was designed as a randomized controlled trial and was conducted in Turkey. The data of the study were collected using the Patient Description Form, Fatigue Severity Scale, and Pittsburgh Sleep Quality Index.

RESULTS

The mean FSS score in the experimental group was 6.86 ± 0.94 before the procedure and 3.42 ± 0.85 after the procedure, the mean PSQI score was 9.45 ± 1.23 before the procedure and 6.68 ± 2.87 after the procedure, and the difference in the mean scores between the two groups was found to be statistically significant (P < 0.001).

CONCLUSION

The results showed that aromatherapy with lavender essential oil has significant impacts on fatigue and sleep in MS patients. Lavender essential oil aromatherapy can be used by nurses as an independent nursing practice. It is an inexpensive, noninvasive, and reliable technique to manage fatigue in individuals with MS.

Effects of lavender essential oil inhalation aromatherapy on depression and sleep quality in stroke patients: A single-blind randomized controlled trial

BACKGROUND AND PURPOSE

Post-stroke depression (PSD) has major implications for rehabilitation, motor recovery, activities of daily living, social and interpersonal functioning, and mortality. In view of the side effects of antidepressants, aromatherapy, a widely used non-pharmacological therapy, has received growing attention in recent years for its benefits of reduced complications, accessibility, and effectiveness. This study was designed to assess the effects of inhalation aromatherapy with lavender essential oil on depression and sleep quality in patients with PSD.

MATERIALS AND METHODS

Forty patients with PSD were enrolled and randomized into experimental and placebo groups. Experimental-group patients inhaled microencapsulated lavender essential oil every night at bedtime over a period of 4 weeks. A nonwoven bag containing 2.3 g of microcapsules with about 1.5 g of lavender essential oil was placed on or under the patient's pillow, depending on the patient's scent sensitivity. Placebo-group patients used the empty nonwoven bags for the same period as the experimental group. The 17-item Hamilton Rating Scale for Depression (HAMD-17), the Zung Self-Rating Depression Scale (SDS), and the Pittsburgh Sleep Quality Index (PSQI) were used to measure outcomes.

RESULTS

The HAMD-17 score, SDS score, and PSQI score showed statistically significant differences between both groups before and after intervention (P ≤ 0.01). The improvement in the experimental group was more marked than in the placebo group (P < 0.05).

CONCLUSION

Lavender essential oil inhalation aromatherapy may help reduce depression and improve sleep quality in patients with PSD.

Effects of Aromatherapy on Physical and Mental Health of Cancer Patients Undergoing Radiotherapy and/or Chemotherapy: A Meta-Analysis

BACKGROUP

Currently, aromatherapy is being increasingly utilized in clinical practice, particularly in managing the side effects associated with radiotherapy and chemoradiotherapy. However, it remains to be established whether aromatherapy can effectively alleviate these symptoms.

OBJECTIVE

To investigate the effects of aromatherapy on the physical and mental health of patients with cancer undergoing radiotherapy and chemotherapy.

METHODS

Seven databases were researched from inception until September 29, 2023, including PubMed, Scopus, and Web of Science, Chinese National Knowledge Infrastructure, Wanfang database, China Biology Medicine disc and VIP Chinese Medical Journal Database. Review Manager version 5.3 was utilized for data analysis. The Cochrane Risk of Bias tool RoB2 was employed to evaluate the quality of the literature included in the study. Evidence quality rating was assessed using the Grading of Recommendations Assessment, Development, and Evaluation (GRADE) approach through the GRADEpro GDT online tool.

RESULTS

Nineteen studies involving 1,541 patients were included. Aromatherapy can alleviate nausea [relative risk (RR)=0.64, 95% confidence interval (CI): 0.53 to 0.78, P<0.05, I2=46%; standardized mean difference (SMD)=-0.86, 95% CI: -1.21 to -0.51, P<0.05, I2=64%] and vomiting (RR=0.54, 95% CI: 0.42 to 0.69, P<0.05, I2=35%; SMD=-1.28, 95% CI: -1.52 to -1.03, P<0.05, I2=92%), improve sleep disorders [mean difference (MD)=-3.39, 95% CI: -3.95 to -2.84, P<0.05, I2=0%], relieve pain (SMD=-1.58, 95% CI: -1.96 to -1.21, P<0.05, I2=0%), mitigate fatigue (SMD=-1.28, 95% CI: -2.44 to -0.11, P<0.05, I2=93%) and enhance quality of life (SMD=0.50, 95% CI: 0.22 to 0.79, P<0.05, I2=0%) in cancer patients after radiotherapy and chemotherapy, but it may not have a significant effect on anxiety. The risk of bias was high in the included studies using the Cochrane Risk of Bias tool RoB2, and no studies were considered to be of high grade according to the GRADE system.

CONCLUSIONS

Aromatherapy is an efficacious, safe and economic adjunctive therapy for cancer patients, which can mend the physical symptoms and mental health of cancer patients. However, more high-quality studies are needed to verify it. (PROSPERO registration No. CRD42023390171).

Continuous inhalation of essential oil increases gray matter volume

Research into the health benefits of scents is on the rise. However, little is known about the effects of continuous inhalation, such as wearing scents on clothing, on brain structure. Therefore, in this study, an intervention study was conducted on a total of 50 healthy female people, 28 in the intervention group and 22 in the control group, asking them to wear a designated rose scent on their clothes for a month. The effect of continuous inhalation of essential oil on the gray matter of the brain was measured by calculating changes in brain images of participants taken before and after the intervention using Magnetic Resonance Imaging (MRI). The results showed that the intervention increased the gray matter volume (GMV) of the whole brain and posterior cingulate cortex (PCC) subregion. On the other hand, the GMV of the amygdala and orbitofrontal cortex (OFC) did not change. This study is the first to show that continuous scent inhalation changes brain structure.

Alleviating effect of lavender (Lavandula angustifolia) and its major components on postherpetic pain: a randomized blinded controlled trial

BACKGROUND

Postherpetic neuralgia (PHN) causes severe pain which can lead to decreased quality-of-life. This study aimed to evaluate the effects of inhalation of lavender (Lavandula angustifolia) oil and its major components (linalool and linalyl acetate) on the pain in patients with PHN.

METHODS

This study was performed at an outpatient clinic. Sixty-four patients with postherpetic neuralgia were randomly allocated to a control group (almond oil) or one of three experimental groups (lavender oil, linalool, or linalyl acetate diluted in almond oil at concentration of 1% v/v), and the participants inhaled the aroma by natural breathing. Quality, severity, and intensity of pain were measured before and after the intervention.

RESULTS

Six patients discontinued the intervention for personal reasons; hence, data from 58 patients were analyzed (control group, n = 14; 1% lavender oil group, n = 15; 1% linalool, n = 15; 1% linalyl acetate, n = 14). Reduction in sensory pain was greater in the 1% lavender oil group, 1% linalool group, and 1% linalyl acetate group than in the control group (all P < 0.001). Reduction in affective pain was greater in the 1% lavender group (P < 0.001) and the 1% linalool group (P = 0.007) than in the control group. Decreases in pain severity and intensity were significantly greater in all three intervention groups than in the control group.

CONCLUSIONS

Inhalation of lavender oil and its major volatile components effectively reduced the quality, severity, and intensity of postherpetic pain, suggesting that lavender oil, linalool, and linalyl acetate may each be an effective intervention for reducing pain in patients with postherpetic neuralgia.

TRIAL REGISTRATION

This study was retrospectively registered on the Clinical Research Information Service.

REGISTRATION NUMBER

KCT0007772, first registration 06/10/2022.

Current Therapeutic Strategies for the Management of Benzodiazepine (BZD) Withdrawal Syndrome: A Review

Benzodiazepines are commonly prescribed drugs for numerous indications such as epilepsy, anti-anxiety, sleep aids, sedatives, and hypnotics. Although the well-tolerated effects of benzodiazepine are seen in many clinical instances, the severity of side effects reduces its quantifiable use. Benzodiazepines, which are medically useful but theoretically unsafe, are frequently recommended by medical practitioners for psychotic patients but have misuse and dependence liabilities. It is impelled as a debateable topic globally about which no one talks. These drugs are also known as silent killers because abruptly stopping them can result in tremors, muscle spasticity, and life-frightening seizures. These drugs are beneficial as well as risky. Nonclinical treatment is simple and well suited and provides support for patients suffering from side effects generated by benzodiazepine withdrawal. This review mainly focuses on antipsychotic drugs and their mechanisms, mortality, withdrawal, abuse, and management via clinical and nonclinical therapies.

Effect of Aromatherapy on Perceived Mental Health Parameters for Academic Department Workers Working From Home During the COVID-19 Pandemic: A Pilot Study

Background

Before the COVID-19 pandemic began, medical staff and academic department workers reported increasing levels of stress and burnout because of strain on the health care system. The COVID-19 pandemic exacerbated this strain and introduced several novel stressors, which included transitioning to remote work. Safe and scalable strategies are needed to help health care workers cope with these stressors. Aromatherapy may help address this need.

Objectives

To assess the effect of 2 aromatherapy interventions (essential oil blends termed STILL and FOCUS) on perceived mental/psychological health parameters for academic department workers working from home during the COVID-19 pandemic.

Methods

Participants were advised to use STILL for 5 days (Monday through Friday). After a 2-day washout period (Saturday and Sunday), participants were instructed to use FOCUS for 5 days (Monday through Friday). Participants completed a visual analog scale survey evaluating restlessness, fatigue, anxiety, stress, happiness, energy, relaxation, calmness, and well-being before and after each of the 2 intervention periods.

Results

Twenty academic department remote workers participated in the study. Mental/psychological health surveys were completed by 6 participants before and after using STILL and by 10 before and after using FOCUS. Five participants answered all survey questions before and after both interventions. Although mean (SD) perceived stress scores improved after both the STILL (4.3 [2.3] vs 1.8 [1.7], P = .03) and FOCUS (2.9 [2.3] vs 1.5 [1.4], P = .02) interventions, this improvement was not statistically significant after Bonferroni correction (adjusted α = .006). Most participants (73.3%) reported that participating in the study was worthwhile, and 81.3% indicated that they would recommend aromatherapy to others.

Conclusions

The STILL and FOCUS aromatherapy interventions did not significantly improve mental/psychological health parameters for remote academic department workers, although perceived stress was marginally improved and participants reported a perceived benefit from using aromatherapy.

Anxiety-Reducing Effects of Lavender Essential Oil Inhalation: A Systematic Review

Anxiety disorders are the most prevalent and disabling mental disorders, causing health-related burdens. With the increasing demand for and interest in safe and acceptable anxiolytics, several studies report the anxiolytic effects of lavender aromatherapy, providing evidence of its physiological and psychological effects. However, existing reviews comprehensively cover the effects of different modes of delivering aromatherapy. Therefore, this review assesses the efficacy of lavender essential oil inhalation in reducing anxiety. The titles and abstracts of relevant articles published over the last five years were searched in PubMed, Web of Science, and Scopus databases. This review only included clinical trials that utilized lavender inhalation for anxiety treatment. Eleven studies comprising 972 participants were included. Of these, 10 reported significantly decreased anxiety levels after lavender oil inhalation. The physiological measures of vital signs, including blood pressure, heart rate, respiratory rate, pulse, and saturation, were conducted in three trials, showing that lavender oil inhalation could physiologically affect anxiety levels. Lavender oil inhalation is a safe and feasible anxiolytic intervention for treating people with diverse types of anxiety. Data from further studies with a high-quality design and accurate information are necessary to confirm the validity of these findings and elucidate the anxiety-reducing mechanisms of lavender inhalation.

The Effect of Reiki and Aromatherapy on Vital Signs, Oxygen Saturation, and Anxiety Level in Patients Undergoing Upper Gastrointestinal Endoscopy: A Randomized Controlled Study

This randomized controlled study aimed to determine the effect of Reiki and aromatherapy on vital signs, oxygen saturation, and anxiety level in patients undergoing upper gastrointestinal endoscopy. The sample consisted of 100 patients divided into Reiki (n = 34), aromatherapy (n = 33), and control (n = 33) groups. Data were collected 3 times (before, during, and after the procedure) using a descriptive characteristics questionnaire, a follow-up form, and the State Anxiety Subscale. The Reiki group had a mean State Anxiety Subscale score of 53.59 ± 2.98 and 43.94 ± 4.31 before and after the procedure, respectively. The aromatherapy group had a mean State Anxiety Subscale score of 54.03 ± 4.03 and 43.85 ± 3.91 before and after the procedure, respectively. The control group had a mean State Anxiety Subscale score of 38.79 ± 4.68 and 53.30 ± 7.26 before and after the procedure, respectively (P < .05). The results showed that the Reiki and aromatherapy groups had significantly lower State Anxiety Subscale scores than the control group after the procedure, indicating that Reiki and aromatherapy help reduce anxiety levels. There was a significant difference in the mean respiratory rates and oxygen saturation levels between the groups (P < .05). In conclusion, patients who do Reiki or undergo aromatherapy are less likely to experience anxiety before upper gastrointestinal endoscopy.

Relieving psychological stress and improving sleep quality by bergamot essential oil use before bedtime and upon awakening: A randomized crossover trial

OBJECTIVES

The COVID-19 pandemic increased psychological stress and decreased sleep quality, especially among young people. Aromatherapy alleviates psychological stress, and bergamot essential oil helps improve depression. This study aimed to verify whether bergamot essential oil use alleviates psychological stress due to the COVID-19 pandemic and improves sleep quality and morning wakefulness.

DESIGN

A placebo-controlled, randomized, open-label, two-arm, two-period crossover trial.

INTERVENTIONS

Each intervention period was 1 week, with a 1-week washout period between the two periods. Participants used a bergamot or placebo spray before bedtime and upon awakening in each period.

MAIN OUTCOME MEASURES

The primary outcome measures were sleep quality and morning wakefulness, assessed using the Ogri-Shirakawa-Azumi sleep inventory MA version (OSA-MA). The secondary outcome measures were depression, anxiety, and stress, assessed using the Depression Anxiety Stress Scales-21 (DASS-21).

RESULTS

A total of 48 university students participated in the study. A significant improvement was observed in "sleepiness on rising," "refreshing on rising," and "sleep length" in the bergamot group. Additionally, a significant improvement was observed in depression, anxiety, and stress.

CONCLUSION

Using bergamot essential oil before bedtime helps relax the mind and body and provides sound sleep. It also improves mood and wakefulness when used upon awakening. Using aromatic essential oils is expected to relieve psychological stress and improve sleep quality and morning wakefulness.

The impact of humor therapy on people suffering from depression or anxiety: An integrative literature review

OBJECTIVES

To identify and synthesize existing research on the effectiveness and feasibility of multiform humor therapy on people suffering from depression or anxiety, with the hope of benefiting future research.

METHODS

An integrative literature review of quantitative, qualitative, and mixed studies was performed. The PubMed, Cochrane Library, Web of Science, Embase, and CINAHL databases were searched up to March 2022. Two independent reviewers conducted each stage of the review process, by assessing eligibility using preferred reporting items for systematic review and meta-analyses (PRISMA) and quality appraisal using the Mixed Methods Appraisal Tool, and data extraction.

RESULTS

In this integrative review, 29 papers were included, containing 2964 participants across a diverse range of studies, including quantitative, qualitative, and mixed methods. The articles were from the United States, Australia, Italy, Turkey, South Korea, Iran, Israel, China, and Germany. The findings indicated that most of the subjects thought humor therapy was effective in improving depression and anxiety while a few participants considered the effect insignificant. However, more high-quality studies will be needed to confirm these conclusions.

DISCUSSION

This review collated and summarized findings from studies examining the impact of humor therapy (medical clowns, laughter therapy/yoga) on people with depression or anxiety, including children undergoing surgery or anesthesia, older people in nursing homes, patients with Parkinson's disease, cancer, mental illness, and undergoing dialysis, retired women, and college students. The results from this review may help inform future research, policy, and practice in humor therapy to improve people's symptoms of depression and anxiety.

IMPACT

This systematic review objectively evaluated the effect of humor therapy on depression and anxiety. As a simple and feasible complementary alternative therapy, humor therapy may provide a favorable alternative for clinicians, nurses, and patients in the future.

Yueju volatile oil plays an integral role in the antidepressant effect by up-regulating ERK/AKT-mediated GLT-1 expression to clear glutamate

Phytochemical investigation of the volatile oil of Yueju (YJVO) and its constituent herbs induced the detection of 52 compounds in YJVO, mainly monoterpenes and sesquiterpenes as well as a small amount of aromatic and aliphatic compounds. 5 of these compounds were found only in the YJVO instead of the volatile oil of its constituent herbs. The anti-depressant effect of YJVO was proved by behavioral tests in chronic unpredictable mild stress (CUMS) mice. An acute oral toxicity evaluation determined the LD50 of YJVO was 5.780 mL/kg. Doppler ultrasound and laser speckle imaging have detected that the YJVO could improve depression-related cerebral blood flow. In addition, related neurotransmitters and proteins were analyzed through targeted metabolomics and immunofluorescence. The potential antidepressant mechanisms of YJVO related to significantly decreasing Glu in CUMS mice by up-regulating the ERK/AKT-mediated expression of GLT-1.

Hawaiian Plants with Beneficial Effects on Sleep, Anxiety, and Mood, etc

Diverse chemical messengers are responsible for maintaining homeostasis in the human body, for example, hormones and neurotransmitters. Various Hawaiian plant species produce compounds that exert effects on these messengers and the systems of which they are a part. The main purpose of this review article is to evaluate the potential effects of Hawaiian plants on reducing pain and anxiety and improving sleep and mood. A comprehensive literature search was conducted in SciFinder, PubMed, Science Direct, Scopus, Google Scholar, and Scientific Information Database between 2019 and 2023 to identify related articles. Results indicate that several Hawaiian plant species, such as M. citrifolia and P. methysticum, have medicinal properties associated with these effects. These plants have been used in traditional Hawaiian cultural practices for centuries, suggesting their potential to benefit human health and well-being. This review presents a comprehensive analysis of the available evidence concerning the potential impacts of Hawaiian plants on sleep, anxiety, mood, and pain.

Aromatherapy for the brain: Lavender's healing effect on epilepsy, depression, anxiety, migraine, and Alzheimer's disease: A review article

Neurological diseases affect the nervous system, including the brain, spinal cord, cranial nerves, nerve roots, autonomic nervous system, neuromuscular junctions, and muscles. Herbal medicine has long been used to cure these diseases. One of these plants is lavender, which is composed of various compounds, including terpenes, such as linalool, limonene, triterpenes, linalyl acetate, alcohols, ketones, polyphenols, coumarins, cineole, and flavonoids. In this review, the literature was searched using scientific search engines and databases (Google Scholar, Science Direct, Scopus, and PubMed) for papers published between 1982 and 2020 via keywords, including review, lavender, and neurological disorders. This plant exerts its healing effect on many diseases, such as anxiety and depression through an inhibitory effect on GABA. The anti-inflammatory effects of this plant have also been documented. It improves depression by regulating glutamate receptors and inhibiting calcium channels and serotonergic factors, such as SERT. Its antiepileptic mechanism is due to an increase in the inhibitory effect of GABA and potassium current and a decrease in sodium current. Therefore, many vegetable oils are also used in herbal medicine. In this review, the healing effect of lavender on several neurological disorders, including epilepsy, depression, anxiety, migraine, and Alzheimer's disease was investigated. All findings strongly support the traditional uses of lavender. More clinical studies are needed to investigate the effect of the plants' pharmacological active constituents on the treatment of life-threatening diseases in humans. The limitations of this study are the low quality and the limited number of clinical studies. Different administration methods of lavender are one of the limitations of this review.

The Effects of Essential Oils on the Nervous System: A Scoping Review

Essential oils are a mixture of natural aromatic volatile oils extracted from plants. The use of essential oils is ancient, and has prevailed in different cultures around the world, such as those of the Egyptians, Greeks, Persians, and Chinese. Today, essential oils are used in traditional and complimentary medicines, aromatherapy, massage therapies, cosmetics, perfumes and food industries. The screening effect of essential oils has been studied worldwide. They demonstrate a range of biological activities, such as antiparasitic, antifungal, antibacterial, antiviral, antioxidant, anti-inflammatory, anticancer, antiaging, and neuroprotective properties. In this scoping review, we provide a 10-year updated comprehensive assessment of volatile oils and their effects on the nervous system. MEDLINE, Scopus, and Google Scholar were systematically and strategically searched for original studies investigating these effects from 2012 to 2022. Approximately seventy studies were selected as included studies. Among these studies, several outcomes were reported, including antistress, antianxiety, analgesic, cognitive, and autonomic effects. Some essential oils showed developmental benefits, with the potential to induce neurite outgrowth. The neurotransmitter receptor level can also be modified by essential oil application. Physiological and pathophysiological outcome measures were reported. For physiological outcomes, arousal, cognitive performance, circadian eating behavior, emotional modulation, consumer acceptance, preferences, and willingness to buy were investigated. For pathophysiological conditions, pain, depression, anxiety, stress, sleep disorder, mental fatigue, agitated behavior, and quality of life were measured. In conclusion, essential oils showed promising effects on the nervous system, which can be further applied to their use in functional foods, drinks, and alternative therapy.

Perceptions, Benefits, and Use of Complementary and Integrative Therapies to Treat Menopausal Symptoms: A Pilot Study

Background

Menopause symptoms can be debilitating, and the use of menopausal hormone therapy (MHT) has declined significantly since the Women's Health Initiative.

Materials and Methods

We surveyed 508 peri- and postmenopausal females to determine (1) the use of complementary and integrative therapies (CIT), MHT; and pharmacotherapies; (2) the perceptions, perceived benefits/risks of CIT, MHT; and pharmacotherapy use; and (3) factors associated with CIT and MHT use for menopause symptom treatment.

Results

The majority of respondents used CIT to treat menopause symptoms based on physician recommendation and research studies. Treatments that were perceived as most beneficial included exercise, mind-body therapies, diet, and spiritual practices, with exercise and mind-body therapies chosen to treat the most common symptoms of sleep disturbances, depressive mood, and anxiety. Higher education level was the main predictive variable for choosing exercise (odds ratio [OR] = 1.27, p = 0.02) and mind-body therapies (OR = 1.57, p = 0.02) to treat menopausal symptoms. Perceptions, beliefs, and use of different CIT by primarily white, affluent, and educated peri- and postmenopausal females to treat menopause symptoms, including sleep disturbances, depression, and anxiety, are driven by conversations with physicians and evidence-based research.

Conclusion

These findings reinforce the necessity for both additional research in more diverse populations, as well as comprehensive, individualized personalized care from an interdisciplinary team that considers the best options available for all female patients.

Dental pain perception and emotional changes: on the relationship between dental anxiety and olfaction

BACKGROUND

The purpose of the study was to determine to what extent olfactory aromatherapy reduces the intensity of dental pain and the level of dental anxiety. It also attempted to corelate between olfactory aromatherapy, stages of dental visits, and various dental procedures.

METHODS

Female patients were enrolled in a randomized controlled study. Olfactory aromatherapy was performed using lavender oils. Patients were randomly assigned to one of two groups: the lavender group, in which patients inhaled 2% lavender vapors, and the control group, in which patients inhaled water vapors. Pain score, anxiety score, and changes in vital signs were among the predictable variables. Anxiety and pain were assessed using the Modified Dental Anxiety Scale (MDAS), Speilberger State-Trait Anxiety Inventory (STAI), and visual analog scales (VAS). The vital signs were systolic (SBP) and diastolic (DBP), heart rate (HR), respiratory rate (RR), and oxygen saturation (Spo2). Variables were evaluated before inhalations, 20 min after inhalations, at the end of settings, and on the following day.

RESULTS

Each group had 175 participants. Pain and anxiety scores were significantly reduced, and all vital signs improved, except for DBP. The MDAS, STAI, and pain scores are reduced by 3.4, 4.2, and 2.4 times, respectively, compared to the control group. Olfactory aromatherapy had the greatest impact during the phase of waiting rooms.

CONCLUSION

When compared to the control group, olfactory aromatherapy reduces anxiety scores three to four times more. Pain perception is reduced by twice as much as in the control group. It also significantly reduces the anxiety associated with minor to moderately stressful dental procedures.

Effect of Chamomile on the Complications of Cancer: A Systematic Review

BACKGROUND AND OBJECTIVES

Despite significant advances in the diagnosis and treatment of cancer, many people across the world still suffer from this chronic disease and its complications. Chamomile as an herbal medicine has gained an increasing attention for relieving cancer complications. This study aimed to integrate and synthesize current international evidence regarding the effect of chamomile on cancer complications.

METHODS

A systematic review was undertaken. Five online databases including Web of Science, PubMed [including MEDLINE], Cochrane Library, Scopus, and Embase were searched and articles published from inception to January 2023 were retrieved. All clinical trials and similar interventional studies on human subjects examining the effects of chamomile on cancer complications were included in the review and research synthesis. Relevant data were extracted from eligible studies after quality appraisals using proper methodological tools. The review results were presented narratively given that meta-analysis was impossible.

RESULTS

A total of 2240 studies were retrieved during the search process, but 18 articles were selected. The total sample size was 1099 patients with cancer of which 622 participants were female. Fifteen studies used an RCT design. Various forms of chamomile were used such as mouthwash, topical material, tea, capsule, syrup and aromatherapy massage. Chamomile effectively reduced oral mucositis, skin complications, depression, and vomiting and also improved appetite and quality of life among cancer patients.

CONCLUSION

The use of chamomile as a non-pharmacologic and safe method can be helpful for mitigating cancer complications in patients with cancer. Therefore, it can be incorporated into routine care along with other therapeutic measures to reduce patients' suffering related to cancer.

SYSTEMATIC REVIEW REGISTRATION NUMBER (PROSPERO)

CRD42022307887.

THE EFFECT OF LAVENDER AROMATHERAPY ON THE LEVEL OF INTRAOPERATIVE ANXIETY IN CAESAREAN CASE UNDER SPINAL ANESTHESIA: A RANDOMIZED CONTROLLED TRIAL

BACKGROUND

Preoperative anxiety can be reduced by aromatherapy. This study aimed to evaluate the effect of lavender aromatherapy in reducing intraoperative anxiety in patients undergoing caesarean section (CS) under spinal anesthesia.

METHODS

This study was two-armed and randomized controlled trial. A total of 96 patients who were scheduled for CS were randomly divided into two groups: the aromatherapy (A) group (n=48), comprising patients who were randomized to receive lavender aromatherapy with mask oxygen after the birth of the baby, and the control (C) group (n=48), comprising patients who inhaled carrier oil. During the preoperative period, baseline anxiety levels and Visual Analog Scale (VAS) pain scores were recorded using the State-Trait Anxiety Inventory (STAI-I) scale. After birth, two drops of oil were inhaled in an oxygen mask for 5 min. After 5 min, the Ramsey Sedation Scale was evaluated, and patients with a score of 1 received 2 mg of intravenous midazolam for sedation. The STAI-I and VAS pain scores were re-evaluated at the third postoperative hour.

RESULTS

The primary outcome was the significant reduction in the need for midazolam brought about by lavender aromatherapy, and the secondary outcomes included postoperative third-hour STAI-I scores, intraoperative complications and patient satisfaction.

CONCLUSION

The effectiveness of lavender aromatherapy, which reduced the need for intraoperative anxiolytics, can be offered as an alternative for pregnant women who undergo CS under spinal anesthesia.

Odor perception of aromatherapy essential oils with different chemical types: Influence of gender and two cultural characteristics

Olfactory perception, and especially affective responses of odors, is highly flexible, but some mechanisms involved in this flexibility remain to be elucidated. This study investigated the odor perceptions of several essential oils used in aromatherapy with emotion regulation functions among college students. The influences of people's characteristics including gender, hometown region, and fragrance usage habit on odor perception were further discussed. Odor perception of nine essential oils, which can be divided into the ester-alcohol type (e.g., lavender oil) and terpene type (e.g., lemon oil) were evaluated under three odor concentrations. The results indicated that chemical type, but not concentration, significantly influenced the odor perception and there was no interaction between the two factors in this study. The arousal and emotional perception scores of odors with terpene-type oil were significantly higher than odors with ester-alcohol type. In terms of people's characteristics, participants from the southern Yangtze river gave a higher familiarity rating to almost all of these odors. The habits of fragrance usage also significantly influenced some of the odors' subjective intensity and emotional perception ratings. However, there were no significant gender differences in most of the odor perceptions. In addition, familiarity and pleasantness were positively correlated, and emotional perception and subjective intensity also showed a weak correlation. These results suggested that users' cultural characteristics could be considered to be important factors that affect the essential oil's odor perception in aromatherapy.

The Effects of Aromatherapy on Anxiety and Depression in People With Cancer: A Systematic Review and Meta-Analysis

Background

Anxiety and depression are highly prevalent in people with cancer. Medical therapies are usually prescribed to alleviate anxiety and depression, but they are associated with a variety of adverse effects. Recently, aromatherapy showed potential as a complementary medicine to improve psychological health and wellbeing. However, its effectiveness on relieving anxiety and depression has not been established.

Objective

This study explored the beneficial effects of aromatherapy on psychological symptoms such as anxiety and depression in people with cancer.

Methods

We searched international databases including PubMed, Web of Science, Cochrane Library, Embase, Medline, Ebscohost, ProQuest and Scopus from inception to 31 May 2021. The risk of bias was assessed using the Cochrane Collaboration's tool for assessing risk of bias. The systematic review and meta-analysis were performed according to the PRISMA guidelines. Quantitative analysis was performed on the studies that met our inclusion criteria, and Meta-analysis was performed on the studies with available data by RevMan software.

Results

The quality of the literatures were assessed carefully by two researchers, a total of 17 studies were included in the systematic review and 10 articles were conducted in meta-analysis. The aromatherapy was effective in relieving anxiety (SMD = -0.49, p < 0.05) in people with cancer. Subgroup analysis suggested that most effective methods were aromatic massage (SMD = -0.70, p < 0.005), aromatherapy with lavender essential oils (SMD = -1.12, p < 0.01), short-time interventions (duration < 4weeks) (SMD = -0.87, p < 0.05) and studies in Asia (SMD = -0.83, p < 0.05). Regarding depression and psychological wellbeing, there were no difference between aromatherapy and control groups.

Conclusion

In cancer patients, the aromatherapy was effective for relieving anxiety. However, there was no beneficial effect on depression and psychological wellbeing.

Systematic Review Registration

PROSPERO, identifier: CRD42021272465.

Inhalation Aromatherapy via Brain-Targeted Nasal Delivery: Natural Volatiles or Essential Oils on Mood Disorders

Mood disorders, also often referred to as affective disorders, are a group of psychiatric illnesses that severely impact mood and its related functions. The high medical expenditures have placed a significant financial burden on patients and their families. Aromatherapy is an alternative and complementary treatment that utilizes essential oils (EOs) or volatile oils (VOs) to achieve major therapeutic goals. In general, EOs are volatile chemicals that enter the body primarily through skin absorption and/or nasal inhalation. In addition, they can work through oral administration. Inhalation aromatherapy has shown unique advantages for treating mood disorders, especially depression, anxiety and mental disorders such as sleep disorder, which have been validated over the last decade through clinical and animal studies. Accumulating evidence has shown that EOs or VOs can bypass the blood-brain barrier to target brain tissue through the nasal-brain pathway. Subsequently, they act on the cerebral cortex, thalamus, and limbic system in the brain to improve symptoms of anxiety, depression and improve sleep quality. Here, we review the natural aromatic plants’ volatiles or essential oils used commonly as adjuncts to manage mood disorders and illustrate the mechanisms of inhalation aromatherapy, and mainly summarized the application of transnasal inhalation aromatherapy in depression, anxiety, and sleep disorders. We conclude that aromatherapy does not cause side-effects, which is vastly different from commonly used psychotropic drugs. Inhalation aromatherapy via brain-targeted nasal delivery offers potentially efficacious treatment for mental disorders and merits further study.

Chamomile (Matricaria chamomilla L.): A Review of Ethnomedicinal Use, Phytochemistry and Pharmacological Uses

Matricaria chamomilla L. is a famous medicinal plant distributed worldwide. It is widely used in traditional medicine to treat all kinds of diseases, including infections, neuropsychiatric, respiratory, gastrointestinal, and liver disorders. It is also used as a sedative, antispasmodic, antiseptic, and antiemetic. In this review, reports on M. chamomilla taxonomy, botanical and ecology description, ethnomedicinal uses, phytochemistry, biological and pharmacological properties, possible application in different industries, and encapsulation were critically gathered and summarized. Scientific search engines such as Web of Science, PubMed, Wiley Online, SpringerLink, ScienceDirect, Scopus, and Google Scholar were used to gather data on M. chamomilla. The phytochemistry composition of essential oils and extracts of M. chamomilla has been widely analyzed, showing that the plant contains over 120 constituents. Essential oils are generally composed of terpenoids, such as α-bisabolol and its oxides A and B, bisabolone oxide A, chamazulene, and β-farnesene, among other compounds. On the other hand, M. chamomilla extracts were dominated by phenolic compounds, including phenolic acids, flavonoids, and coumarins. In addition, M. chamomilla demonstrated several biological properties such as antioxidant, antibacterial, antifungal, anti-parasitic, insecticidal, anti-diabetic, anti-cancer, and anti-inflammatory effects. These activities allow the application of M. chamomilla in the medicinal and veterinary field, food preservation, phytosanitary control, and as a surfactant and anti-corrosive agent. Finally, the encapsulation of M. chamomilla essential oils or extracts allows the enhancement of its biological activities and improvement of its applications. According to the findings, the pharmacological activities of M. chamomilla confirm its traditional uses. Indeed, M. chamomilla essential oils and extracts showed interesting antioxidant, antibacterial, antifungal, anticancer, antidiabetic, antiparasitic, anti-inflammatory, anti-depressant, anti-pyretic, anti-allergic, and analgesic activities. Moreover, the most important application of M. chamomilla was in the medicinal field on animals and humans.

Anxiety and depression among healthcare workers during COVID-19 pandemic: A cross-sectional study

INTRODUCTION

During a pandemic, healthcare workers (HCWs) are exposed to many stresses that predispose them to psychological disorders. This study aimed to evaluate the impact of the coronavirus disease 2019 (COVID-19) pandemic on the anxiety and depression level of HCWs and determine the relationship between them in terms of their demographic characteristics.

MATERIAL AND METHODS

This study used a cross-sectional design. The participants consisted of clinical, administrative, and cleaning staff who were working in a referral COVID-19 hospital in an urban area of Iran. The census sampling method was used for recruiting the participants from May to August 2020. The Generalized Anxiety Disorder-7 (GAD-7) questionnaire and the Center for Epidemiologic Studies Depression (CES-D) Scale were employed to collect data. Then, data were analyzed using multivariable linear regression analysis.

RESULTS

One hundred forty HCWs participated in this study. The mean scores of anxiety and depression were 6.64 (4.86) and 18.21 (10.59), respectively. There was a significant direct association between anxiety and depression (P < 0.001). In addition, female gender (P = 0.01) and having a history of infection with COVID-19 (P = 0.001) were associated with a higher level of anxiety. Moreover, having a history of being quarantined due to COVID-19 was associated with a higher level of depression (P = 0.03).

CONCLUSION

According to the findings of the present study, considering the mental health of HCWs during the generalized anxiety outbreak of COVID-19 should be a priority, and appropriate interventions should be planned to improve their psychological condition.

Chemical and Biochemical Characterization of Essential Oils and Their Corresponding Hydrolats from Six Species of the Lamiaceae Family

Many plants belonging to the Lamiaceae family are rich in essential oils (EOs) which are intensively used for aromatherapy, food and beverage flavoring, alternative medicine, cosmetics, and perfumery. Aerial parts of Thymus vulgaris L., Thymus pannonicus All., Lavandula angustifolia L., Lavandula x intermedia, Origanum vulgare L., and Origanum vulgare var. aureum L. were subjected to hydrodistillation, and both resulting fractions were analyzed. The purpose of this study was to determine the chemical composition, antioxidant activity, and total phenolic content of six essential oils and their corresponding hydrolats (HDs) through GC-MS and spectrophotometric analyses. Overall, 161 compounds were identified, some found exclusively in essential oils and others in hydrolats, making them individual products with specific end purposes. The total phenolic content was the highest for the Thymus vulgaris L. EOs (3022 ± mg GAE L-1), because of its high phenolic oxygenated monoterpenes content (thymol and carvacrol) and the smallest for the Lavandula angustifolia L. EOs (258.31 ± 44.29 mg GAE L-1), while hydrolats varied from 183.85 ± 0.22 mg GAE L-1 for Thymus vulgaris L. HD and 7.73 mg GAE L-1 for Thymus pannonicus All. HD. Significant antioxidant effects determined through DPPH• and ABTS•+ assays were also observed in samples with higher hydrophilic compounds. The highest antioxidant activity was determined for Thymus vulgaris L. EO and its corresponding HD. Although EOs are the principal traded economic product, HDs represent a valuable by-product that could still present intense antiseptic activities, similar to their corresponding EOs (thyme and oregano), or have multiple aromatherapy, cosmetics, and household applications (lavender and lavandin).

Comparing the Effect of Aromatherapy with Peppermint and Lavender Essential Oils on Fatigue of Cardiac Patients: A Randomized Controlled Trial

Methods

This randomized controlled clinical trial was conducted on 105 cardiac patients. They were randomly divided into three groups: peppermint essential oil (n = 35), lavender essential oil (n = 35), and control (n = 35). Fatigue Severity Scale (FSS) was used to collect data. The intervention was performed for 7 nights. Before and after the intervention, the questionnaire was completed by all patients. In each intervention group, patients inhaled 3 drops of lavender or peppermint essential oils. In the control group, patients inhaled 3 drops of aromatic placebo.

Results

The results showed the average fatigue decreased in the study groups. There was no statistically significant difference between the two groups of lavender and peppermint in terms of mean fatigue after the intervention. However, there was a statistically significant difference between lavender and control groups (P < 0.001), as well as peppermint and control groups (P < 0.001).

Conclusion

Aromatherapy with peppermint and lavender essential oils can reduce the fatigue of cardiac patients, so the use of these fragrances is recommended.

Therapeutic Effect and Mechanisms of Essential Oils in Mood Disorders: Interaction between the Nervous and Respiratory Systems

Essential oils (EOs) are extracted from plants and contain active components with therapeutic effects. Evidence shows that various types of EOs have a wide range of health benefits. In our previous studies, the potential of lavender EO for prevention and even treatment of depression and anxiety symptoms was demonstrated. The favourable outcomes may be due to multiple mechanisms, including the regulation of monoamine level, the induction of neurotrophic factor expression, the regulation of the endocrine system and the promotion of neurogenesis. The molecules of EOs may reach the brain and exert an effect through two distinctive pathways, namely, the olfactory system and the respiratory system. After inhalation, the molecules of the EOs would either act directly on the olfactory mucosa or pass into the respiratory tract. These two delivery pathways suggest different underlying mechanisms of action. Different sets of responses would be triggered, such as increased neurogenesis, regulation of hormonal levels, activation of different brain regions, and alteration in blood biochemistry, which would ultimately affect both mood and emotion. In this review, we will discuss the clinical effects of EOs on mood regulation and emotional disturbances as well as the cellular and molecular mechanisms of action. Emphasis will be put on the interaction between the respiratory and central nervous system and the involved potential mechanisms. Further evidence is needed to support the use of EOs in the clinical treatment of mood disturbances. Exploration of the underlying mechanisms may provide insight into the future therapeutic use of EO components treatment of psychiatric and physical symptoms.

Smell and Stress Response in the Brain: Review of the Connection between Chemistry and Neuropharmacology

The stress response in the brain is not fully understood, although stress is one of the risk factors for developing mental disorders. On the other hand, the stimulation of the olfactory system can influence stress levels, and a certain smell has been empirically known to have a stress-suppressing effect, indeed. In this review, we first outline what stress is and previous studies on stress-responsive biomarkers (stress markers) in the brain. Subsequently, we confirm the olfactory system and review previous studies on the relationship between smell and stress response by species, such as humans, rats, and mice. Numerous studies demonstrated the stress-suppressing effects of aroma. There are also investigations showing the effects of odor that induce stress in experimental animals. In addition, we introduce recent studies on the effects of aroma of coffee beans and essential oils, such as lavender, cypress, α-pinene, and thyme linalool on the behavior and the expression of stress marker candidates in the brain. The transfer of volatile components into the brain is also discussed while using the results of thyme linalool as an example. These studies may provide a good opportunity to connect chemical research at the molecular level with neuropharmacological approaches in the future.