Masahiro Toda’s research while affiliated with Osaka Dental University and other places

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Publications (50)


Figure 1 of 1
Levels of awakening salivary CgA in response to stress in healthy subjects
  • Article
  • Full-text available

September 2010

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159 Reads

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25 Citations

Environmental Health and Preventive Medicine

Rei Den

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Masahiro Toda

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To determine the changes in salivary chromogranin A (CgA) levels upon awakening in response to of stress by investigating the relationship between salivary CgA levels and the stress response as assessed by GHQ-28 tests. The study cohort comprised 40 healthy male university students (age range 19-22 years). Salivary CgA levels were measured at 7:00 a.m. (awakening) and at 7:30, 8:00, and 8:30 a.m. (after awakening). The salivary CgA level was 0.91 ± 0.20 and 0.42 ± 0.1 pmol/ml at 7:00 a.m. in students scoring low (n = 26) and high (n = 14), respectively, on the "severe depression" subscale. This difference in salivary CgA levels at 7:00 between high and low scorers was statistically significant (p < 0.05). Our findings indicate that depression may influence secretions of salivary CgA via chronic stress-related attenuation of the sympathetic-adrenomedullary system activity.

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[Effects of Tai Chi exercise on physical and mental health]

September 2010

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22 Reads

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4 Citations

Nippon Eiseigaku Zasshi (Japanese Journal of Hygiene)

Recently, Tai Chi, which is one of the Chinese traditional martial arts, has been receiving attention. The main feature of Tai Chi is its flowing movements including loosening up, relaxing, and practicing meditation with slow abdominal respiration. Tai Chi is widely taken as part of health-promotion activities or rehabilitation training, and significant mental and physical effects have been reported so far. In this review report, Tai Chi was confirmed to be beneficial not only as a rehabilitation training for old people or patients with various diseases but also as an exercise for healthy people. These findings suggest the potential of Tai Chi as a complementary and alternative therapy.


Relationships of personality and lifestyle with mobile phone dependence among female nursing students

March 2009

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1,186 Reads

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145 Citations

Social Behavior and Personality An International Journal

Satoko Ezoe

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Masahiro Toda

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Kimio Yoshimura

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To clarify the relationships of personality and lifestyle with mobile phone dependence, defined as an intermittent craving to use a mobile phone or excessive mobile phone use, we administered a self-report questionnaire to 132 female college students attending a nursing school in Osaka, Japan. Results of multiple regression analysis indicated that scores for extroversion and neuroticism were positively related to the score of the Mobile Phone Dependence Questionnaire (MPDQ; Toda, Monden, Kubo, & Morimoto, 2004), while the score for healthy practices was negatively related to that of the MPDQ. These findings suggest that mobile phone dependence in female college students is associated with elevated traits of extroversion and neuroticism, as well as an unhealthy lifestyle.


Relations Among TMD, Bruxism, Lifestyle, and Psychological Stress

November 2008

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46 Reads

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7 Citations

Prosthodontic Research & Practice

The purpose of this experiment was to clarify relations among temporomandibular disorders (TMDs), bruxism, lifestyle, and psychological stress. Participants were selected from female patients (n=29, 23-78 yrs, mean age 50.8 yrs).Eighteen females were diagnosed as having TMD (TMD group, mean age 47.6 yrs), and 11 females were diagnosed as not having TMD (Non-TMD group, mean age 55.9 yrs). All participants underwent self-administered questionnaires which consisted of the Health Practice Index (HPI), the Tokai University Type A Pattern Scale, the 28-item General Health Questionnaire (GHQ-28), and the Zung Self-Rating Depression Scale (Zung-SDS). They were instructed to sleep at home with the disposable sleep bruxism sensor (BiteStrip®, S.L.P.) attached on their left masseter. The number of bruxers was significantly higher in the TMD group than in the Non-TMD group (P<.05), which suggested an association between bruxism and TMD. Based on BiteStrip score, participants were divided into bruxers and non-bruxers. In Non-TMD groups there was significant difference only in lifestyle, especially sleep and mental stress between bruxers and non-bruxers (P<.05). Bruxers showed higher anxiety and insomnia score than non-bruxers. Bruxism in the Non-TMD group was associated with lifestyle, especially with sleeping hours and mental stress. This suggests that an improvement in lifestyle might reduce bruxism events in the Non-TMD group.


Basal levels of salivary chromogranin A, but not α‐amylase, are related to plasma norepinephrine in the morning

October 2008

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13 Reads

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1 Citation

Stress and Health

To evaluate the activity of sympatho–adrenomedullary (SAM) system, testing for salivary chromogranin A (CgA) and α-amylase (sAA) has been receiving attention. We investigated the correlation between levels of plasma norepinephrine (NE) and salivary CgA or sAA. From 21 healthy males, blood and saliva samples were collected at 8:00, 10:30, 12:30 and 17:30. Levels of plasma NE, salivary CgA and sAA were determined at each sampling point. To avoid the influence of the salivary flow, resultant levels of salivary CgA and sAA were adjusted according to salivary flow rates and salivary protein, respectively. A significant correlation between plasma NE levels and salivary CgA/protein was detected in samples taken at 8:00 (p < 0.01). In samples taken at 10:30, 12:30 and 17:30, however, there was no such correlation. Meanwhile, no significant correlation between plasma NE levels and sAA/min was detected during the sampling period. These findings suggest that morning results for CgA may be useful as a predictor for SAM system activity. Copyright © 2008 John Wiley & Sons, Ltd.


Effect of lavender aroma on salivary endocrinological stress markers

October 2008

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861 Reads

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144 Citations

Archives of Oral Biology

We evaluated the stress relief effect of lavender aroma by measuring sensitive salivary endocrinological stress markers, cortisol and chromogranin A (CgA). Thirty healthy students performed a serial arithmetic task for 10min and then rested for 10min. During the resting period, 16 students (aroma group) were exposed to airborne organic essential oil of lavender. Saliva samples were collected immediately before and after the arithmetic task, and at 5 and 10min after that. Salivary cortisol and CgA levels were determined by enzyme-linked immunosorbent assay. In the aroma group, levels of CgA that had been elevated at the end of the arithmetic task were statistically significantly lower 10min later. The control group showed no such change. During the protocol, no statistically significant changes in levels of cortisol were detected in either the aroma group or the control group. These findings suggest that lavender aroma has a stress relief effect.


Comparison of saliva sampling methods for measurement of salivary adiponectin levels

July 2008

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60 Reads

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21 Citations

Scandinavian Journal of Clinical and Laboratory Investigation

We measured salivary adiponectin levels in saliva samples collected in two different ways and compared the results. Using the Salivette system, we collected samples from 30 healthy females into test tubes. Salivary adiponectin levels were evaluated using a commercial enzyme immunoassay kit for plasma but with a slightly modified method. While there was a significant correlation between adiponectin levels in plasma and test-tube saliva (p<0.05), no correlation between adiponectin levels in plasma and Salivette-sampled saliva was apparent. These findings suggest that test-tube sampling is more reliable than use of the Salivette system for measuring salivary adiponectin levels.


Changes in salivary physiological stress markers associated with winning and losing

March 2008

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72 Reads

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38 Citations

Biomedical Research

Using a representative table game popular in Japan known as shogi, or Japanese chess, we investigated the effects of winning and losing on saliva composition. The subjects were 90 healthy male university students who were members of a shogi club. Saliva samples were collected immediately before and after playing shogi, and again 30 min later. Salivary cortisol and testosterone levels in the samples were determined by ELISA and EIA, respectively. After finishing each game, the competitiveness of the game was evaluated using questionnaires. In the samples taken after playing shogi, there was an increase in the levels of salivary testosterone and cortisol, regardless of whether the subject won or lost, and the tendency was more pronounced in competitive games. There were no such changes in the control group, who did not play a game prior to providing the samples. Our results suggest that stress response is intimately linked with competition and could be used to determine which players are more capable of handing stress in a competitive environment.


Health Benefits for Women Staying With Their Husbands During a Long-Term Trip to a Hot Springs Spa

February 2008

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14 Reads

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3 Citations

Archives of Environmental and Occupational Health

The authors collected saliva samples from 15 married couples and 13 women staying with a female companion (N = 43) during an 8-day stay at a spa resort in Nagano, Japan. To examine changes in endocrinological stress markers, the authors evaluated participants' levels of salivary cortisol and chromogranin A (CgA) by enzyme-linked immunosorbent assay. By the eighth day, women staying with their husbands had significantly increased levels of cortisol and CgA. During the protocol, the authors observed no significant variation in levels of cortisol or CgA for either the women who were staying with same-sex companions or the male spouses. These findings suggest that the effects of long-term stays in a spa resort are more beneficial for married women staying with their husbands than for either married men or women staying with female companions.



Citations (44)


... The results of this study establish the sensitivity and specificity of our SERS platform making it suitable for label-free and non-invasive detection in biological matrices such as tears [56] and saliva [57] that would alleviate the sampling stress for patients. While they do not demand invasive extraction, glucose and glycated proteins in saliva [56] and tears [57] are present at much lower concentrations than in blood making it challenging for existing assays to measure advanced glycation end product modified proteins in these fluids. ...

Reference:

Silver‐Coated Disordered Silicon Nanowires Provide Highly Sensitive Label‐Free Glycated Albumin Detection through Molecular Trapping and Plasmonic Hotspot Formation
Correlation between Saliva Glycated and Blood Glycated Proteins
  • Citing Article
  • January 2003

Environmental Health and Preventive Medicine

... ideas, and outright rejection of the child 19 . Numerous further studies provide evidence for an association between PPD and mother-child bonding disorders 14,[18][19][20]24,31 . A possibility to prevent adverse outcomes such as PPD and an impaired mother-child-bonding might be breastfeeding. ...

Maternal Depression and Mother-to-Infant Bonding: The Association of Delivery Mode, General Health and Stress Markers

Open Journal of Obstetrics and Gynecology

... In addition, Brezing et al. (2010) in their review of behavioral addictions in youth alluded to the positive association between depression and problematic internet use in adolescents and college students, where internet use is used as a coping strategy. Likewise, we had similar expectation with regard to the effect of personality type A; once more presumed by findings from earlier studies revealing significant positive association between neurotic personality trait and smartphone addiction in Korean college students (Mok et al., 2014), personality type A and problematic mobile phone use in Turkish university students (Sahin et al., 2013), and type A behavior traits and mobile phone dependence after adjustment for health-related lifestyle habits and depressive state in Japanese medical university students (Masahiro & Satoko, 2013). ...

Multifactorial study of mobile phone dependence in medical students: Relationship to health-related lifestyle, Type A behavior, and depressive state

Open Journal of Preventive Medicine

... Clinical trial [21][22][23] Cross-sectional study [18,[24][25][26][27][28][29][30][31][32][33][34][35][36][37] Prospective cohort study [20,[38][39][40][41][42][43][44][45][46][47][48][49] Iranian version of 19-item FSFI [18,[50][51][52] Hungarian version of 19-item FSFI [35] Taiwan version of 19-item FSFI [44,53] The Turkish version of 19-item FSFI [46,54] German version of Female Sexual Function Index (FSFI-d) [38,55] SFQ28 [56] 2002 Sexual health Cross-sectional study [57] ----PISQ-12 [58] 2003 Sexual function in women with pelvic organ prolapse and/or urinary incontinence ...

Association Between Sexual Health and Delivery Mode

Sexual Medicine

... Cortisol is often referred to as the "stress hormone," and its reduction is associated with lowered stress levels [161]. In 2013, Varney and Buckle found that inhaling a mixture of essential oils, including peppermint oil, had a positive impact on individuals suffering from mental exhaustion or moderate burnout [162]. A study led by Moss et al., (2023) showed that the presence of peppermint aroma in a simulated driving environment resulted in significant reductions in aggressive driving behaviors [163]. ...

Evaluation of Effects of Lavender and Peppermint Aromatherapy Using Sensitive Salivary Endocrinological Stress Markers
  • Citing Article
  • December 2011

Stress and Health

... Bruxism is a well-known risk factor for the development of TMDs 5,6 . Studies conducted on adults have reported that oral parafunctional habits are a possible cause of TMDs and that parafunctional habits were positively correlated with both muscle disorders and TMDs [7][8][9][10][11][12] . ...

Relations Among TMD, Bruxism, Lifestyle, and Psychological Stress
  • Citing Article
  • November 2008

Prosthodontic Research & Practice

... One study on college students found larger decreases in cortisol after going for a walk in a green environment compared to viewing natural landscapes on a screen indoors (Olafsdottir et al., 2020). In contrast, another study in adult males found a decrease of salivary cortisol in a sedentary indoor condition but no change in a forest-walking condition (Toda et al., 2013). Conflicting findings of previous studies might result from differences in study population and design, in terms of experimental conditions, walking duration and speed, and type of environment (Corazon et al., 2019). ...

Effects of woodland walking on salivary stress markers cortisol and chromogranin A
  • Citing Article
  • February 2013

Complementary Therapies in Medicine

... Higher scores indicate healthier lifestyle. Respondents with 6 -8 points were allocated to the good, and those with 0 -5 points to the poor, category [9]. Based upon the lifestyle study by Belloc and Breslow [10], and taking into consideration cultural differences, the question items, phrasing, and scoring were designed for Japanese subjects. ...

Health-related lifestyle and patterns of behavior related to health effects of leisure travel
  • Citing Article
  • January 2007

Social Behavior and Personality An International Journal

... Moreover, they represent a highrisk group for mobile phone addiction [45,46]. Mobile phone dependence, also known as mobile phone addiction or problematic mobile phone use, refers to the excessive use of mobile phones where individuals struggle to control their usage time [47][48][49]. The primary symptoms include irritability and anger when the network connection is lost, as well as persistent anxiety when the device's battery is low [50]. ...

Mobile phone dependence of female students and perceived parental rearing attitudes
  • Citing Article
  • January 2008

Social Behavior and Personality An International Journal

... • The higher amount of time spent on the smartphone had a negative effect on workplace productivity, at-home activities and recreational activities [38,43,62]. ...

Relationships of personality and lifestyle with mobile phone dependence among female nursing students
  • Citing Article
  • March 2009

Social Behavior and Personality An International Journal