Abstract
The relations between salivary variables, lifestyle and mental health status were investigated for 61 healthy female university students. The salivary secretion rates were significantly higher in the good lifestyle groups compared with the poor lifestyle groups. Among the 8 lifestyle items tested. “eating breakfast” and “mental stress” were significantly related to the salivary secretion rates. The present findings suggest that the acquisition of a good lifestyle is also very important from the viewpoint of the prevention of oral disease.
A highly significant correlation (r=0.97; p<0.01) between the salivary cortisol levels and the cortisol secretion rates when controlled for the salivary secretion rates was also observed. This suggests that there is a high correlation between the intact salivary cortisol levels and the total cortisol quantity per unit time. Therefore, both these values can be used as a good index for the salivary cortisol determination.
Key words: lifestyle, saliva secretion, cortisol, mental stress, breakfast eating
References
- 1).Yamaguchi M, Takai N. Saliva as a mirror of the body (in Japanese). Tokyo: Kougyou-chousakai, 1999.
- 2).Johansson G, Ravald N. Comparison of some salivary variables between vegetarians and omnivores. Eur. J. Oral. Sci. 1995; 103: 95–98. [DOI] [PubMed]
- 3).Johansson G, Birkhed D. Effect of a long-term change from a mixed to a lacto-vegetarian diet on human saliva. Arch. Oral. Biol. 1994; 39: 283–288. [DOI] [PubMed]
- 4).Tenovuo JO. Human saliva: clinical chemistry and microbiology. florida: CRC press, 1989.
- 5).Kirschbaum C, Hellhammer DH. Salivary cortisol in psychoneuroendocrine research: recent developments and applications. Psychoneuroendocrinology 1994; 19: 313–333. [DOI] [PubMed]
- 6).Morimoto K. “Stress-kiki no yobo-igaku” (in Japanese). Tokyo: NHK books, 1997.
- 7).Kusaka Y, Kondou H, Morimoto K. Healthy lifestyles are associated with higher natural killer cell activity. Prev. Med. 1992; 21: 602–615. [DOI] [PubMed]
- 8).Hagihara A, Morimoto K. Personal health practices and attitudes toward nonsmokers' legal rights in Japan. Soc. Sci. Med. 1991; 33: 717–721. [DOI] [PubMed]
- 9).Goldberg DP. Manual of the General Health Questionnaire. Windsor: NFER Publishing, 1978.
- 10).Zung WWK. A self-rating depression scale. Arch. Gen. Psychiatry 1965; 12: 63–70. [DOI] [PubMed]
- 11).Fukuda K, Kobayashi S. The Japanese version of the SDS (in Japanese). Kyoto: Sankyobo, 1983.
- 12).Shimada M, Takahashi K, Ohkawa T, Segawa M, Higurashi M. Determination of salivary cortisol by ELISA and its application to the assessment of the circadian rhythm in children. Horm. Res. 1995; 44: 213–217. [DOI] [PubMed]
- 13).Nakamura Y, Morimoto T. Basic physiology for dental studennts (in Japanese). Tokyo: Ishiyaku Publishers, 1987.
- 14).Johansson I, Ericson T. Effects of a 900-kcal liquid or solid diet on saliva flow rate and composition in female subjects. Caries Res. 1989; 23: 184–189. [DOI] [PubMed]
- 15).Jenkins GN, Edgar WM. The effect of daily gum-chewing on salivary flow rates in man. J. Dent. Res., 1989; 68: 786–790. [DOI] [PubMed]
- 16).Dodds MWJ, Hsieh SC, Johnson DA. The effect of increased mastication by daily gum-chewing on salivary gland output and dental plaque acidogenicity. J. Dent. Res. 1991; 70: 1474–1478. [DOI] [PubMed]
- 17).Ferguson DB, Botchway CA. Circadian variations in the flow rate and composition of whole saliva stimulated by mastication. Archs. Oral. Biol. 1980; 24: 877–881. [DOI] [PubMed]
- 18).Kirschbaum C, Hellhammer DH. Salivary cortisol in psychobiological research: an overview. Neuropsychobiology 1989; 22: 150–169. [DOI] [PubMed]
- 19).Åkerstedt T, Levi L. Circadian rhythms in the secretion of cortisol, adrenaline and noradrenaline. Eur. J. Clin. Invest. 1978; 8: 57–58. [DOI] [PubMed]
- 20).Navazesh M, Christensen CM. A comparison of whole mouth resting and stimulated salivary measurement procedures. J. Dent. Res. 1982; 61: 1158–1162. [DOI] [PubMed]
- 21).Ezoe S, Morimoto K. Behavioral lifestyle and mental health status of Japanese factory workers. Prev. Med. 1994; 23: 98–105. [DOI] [PubMed]
- 22).Morimoto K, Takeshita T, Takeuchi T, Maruyama S, Ezoe S, Incue C, Nakajima M. What mental stress reactions mean—from gene alterations to job satisfaction—(in Japanese). Job Stress Res. 1995; 3: 12–24.
- 23).Kreuz LE, Rose RM, Jennings JR. Suppression of plasma testosterone levels and psychological stress: A longitudinal study of young men in officer candidate school. Arch. Gen. Psychiatry 1972; 26: 479–482. [DOI] [PubMed]
- 24).Payne RL, Rick JT, Smith GH, Cooper RG. Multiple indicators of stress in an ‘active’ job—cardiothoracic surgery. J. Occup. Med. 1984; 26: 805–808. [DOI] [PubMed]
- 25).Perna FM, McDowell SL. Role of psychological stress in cortisol recovery from exhaustive exercise among elite athletes. Int. J. Behav. Med. 1995; 2: 13–26. [DOI] [PubMed]
- 26).Perna FM, Antoni MH, Kumar M, Cruess DG, Schneiderman N. Cognitive-behavioral intervention effects on mood and cortisol during exercise training. Ann. Behav. Med. 1998; 20: 92–98. [DOI] [PubMed]