Li Q, Nakadai A, Matsushima H, Miyazaki Y, Krensky AM, Kawada T, et al. Phytoncides (wood essential oils) induce human natural killer cell activity. Immunopharmacol Immunotoxicol. 2006;28:319–33.
Li Q, Morimoto K, Nakadai A, Inagaki H, Katsumata M, Shimizu T, et al. Forest bathing enhances human natural killer activity and expression of anti-cancer proteins. Int J Immunopathol Pharmacol. 2007;20:3–8.
Li Q, Morimoto K, Kobayashi M, Inagaki H, Katsumata M, Hirata Y, et al. Visiting a forest, but not a city, increases human natural killer activity and expression of anti-cancer proteins. Int J Immunopathol Pharmacol. 2008;21:117–28.
Li Q, Morimoto K, Kobayashi M, Inagaki H, Katsumata M, Hirata Y, et al. A forest bathing trip increases human natural killer activity and expression of anti-cancer proteins in female subjects. J Biol Regul Homeost Agents. 2008;22:45–55.
Yamaguchi M, Deguchi M, Miyazaki Y. The effects of exercise in forest and urban environments on sympathetic nervous activity of normal young adults. J Int Med Res. 2006;34:152–9.
Morita E, Fukuda S, Nagano J, Hamajima N, Yamamoto H, Iwai Y, et al. Psychological effects of forest environments on healthy adults: Shinrin-yoku (forest-air bathing, walking) as a possible method of stress reduction. Public Health. 2007;121:54–63.
Forestry Agency of Japan. Available at: http://www.rinya.maff.go.jp/toukei/genkyou/shinrin-jinkou.htm. (2002).
Li Q, Nakadai A, Ishizaki M, Morimoto K, Ueda A, Krensky AM, et al. Dimethyl 2, 2-dichlorovinyl phosphate (DDVP) markedly decreases the expression of perforin, granzyme A and granulysin in human NK-92CI cell line. Toxicology. 2005;213:107–16.
Li Q, Kobayashi M, Kawada T. DDVP markedly decreases the expression of granzyme B and granzyme 3/K in human NK cells. Toxicology. 2008;243:294–302.
Li Q, Nagahara N, Takahashi H, Takeda K, Okumura K, Minami M. Organophosphorus pesticides markedly inhibit the activities of natural killer, cytotoxic T lymphocyte and lymphokine-activated killer: a proposed inhibiting mechanism via granzyme inhibition. Toxicology. 2002;172:181–90.
Li Q, Nakadai A, Takeda K, Kawada T. Dimethyl 2, 2-dichlorovinyl phosphate (DDVP) markedly inhibits activities of natural killer cells, cytotoxic T lymphocytes and lymphokine-activated killer cells via the Fas-ligand/Fas pathway in perforin-knockout (PKO) mice. Toxicology. 2004;204:41–50.
Okada S, Li Q, Whitin JC, Clayberger C, Krensky AM. Intracellular mediators of granulysin-induced cell death. J Immunol. 2003;171:2556–62.
Komori T, Fujiwara R, Tanida M, Nomura J, Yokoyama MM. Effects of citrus fragrance on immune function and depressive states. Neuroimmunomodulation. 1995;2:174–80.
da Silva SL, Figueiredo PM, Yano T. Chemotherapeutic potential of the volatile oils from Zanthoxylum rhoifolium Lam leaves. Eur J Pharmacol. 2007;576:180–8.
Grassmann J, Hippeli S, Vollmann R, Elstner EF. Antioxidative properties of the essential oil from Pinus mugo. J Agric Food Chem. 2003;51:7576–82.
Li Q, Morimoto K, Nakadai A, Qu T, Matsushima H, Katsumata M, et al. Healthy lifestyles are associated with higher levels of perforin, granulysin and granzymes A/B-expressing cells in peripheral blood lymphocytes. Prev Med. 2007;44:117–23.
Bargellini A, Barbieri A, Rovesti S, Vivoli R, Roncaglia R, Borella P. Relation between immune variables and burnout in a sample of physicians. Occup Environ Med. 2000;57:453–7.
Glover DA, Steele AC, Stuber ML, Fahey JL. Preliminary evidence for lymphocyte distribution differences at rest and after acute psychological stress in PTSD-symptomatic women. Brain Behav Immun. 2005;19:243–51.
Souza SS, Castro FA, Mendonça HC, Palma PV, Morais FR, Ferriani RA, et al. Influence of menstrual cycle on NK activity. J Reprod Immunol. 2001;50:151–9.
Yovel G, Shakhar K, Ben-Eliyahu S. The effects of sex, menstrual cycle, and oral contraceptives on the number and activity of natural killer cells. Gynecol Oncol. 2001;81:254–62.
Roszkowski PI, Hyc A, Stopińska-Głuszak U, Malejczyk J. Natural killer cell activity and sex hormone levels in mastopathy. Gynecol Endocrinol. 1997;11:399–404.
Szekeres-Bartho J, Polgar B, Kozma N, Miko E, Par G, Szereday L, et al. Progesterone-dependent immunomodulation. Chem Immunol Allergy. 2005;89:118–25.
Angeli A. Circadian rhythms of human NK cell activity. Chronobiologia. 1992;19:195–8.
Nieman DC. Special feature for the Olympics: effects of exercise on the immune system: exercise effects on systemic immunity. Immunol Cell Biol. 2000;78:496–501.
Ochshorn-Adelson M, Bodner G, Toraker P, Albeck H, Ho A, Kreek MJ. Effects of ethanol on human natural killer cell activity: in vitro and acute, low-dose in vivo studies. Alcohol Clin Exp Res. 1994;18:1361–7.
Kusaka Y, Kondou H, Morimoro K. Healthy lifestyles are associated with higher natural killer cell activity. Prev Med. 1992;21:602–15.
Frankenhaeuser M. Experimental approach to the study of catecholamines and emotion. In: Levi L, editor. Emotions, their parameters and measurement. New York: Raven Press; 1975. 209pp.
Moleman P, Tulen JH, Blankestijn PJ, Man in ‘t Veld AJ, Boomsma F. Urinary excretion of catecholamines and their metabolites in relation to circulating catecholamines. Six-hour infusion of epinephrine and norepinephrine in healthy volunteers. Arch Gen Psychiatry. 1992;49:568–72.
Brown DE, James GD, Mills PS. Occupational differences in job strain and physiological stress: female nurses and school teachers in Hawaii. Psychosom Med. 2006;68:524–30.
van der Beek AJ, Meijman TF, Frings-Dresen MH, Kuiper JI, Kuiper S. Lorry drivers’ work stress evaluated by catecholamines excreted in urine. Occup Environ Med. 1995;52:464–9.
Garland M, Doherty D, Golden-Mason L, Fitzpatrick P, Walsh N, O’Farrelly C. Stress-related hormonal suppression of natural killer activity does not show menstrual cycle variations: implications for timing of surgery for breast cancer. Anticancer Res. 2003;23:2531–5.
Yokota T, Uehara K, Nomoto Y. Addition of noradrenaline to intrathecal morphine augments the postoperative suppression of natural killer cell activity. J Anesth. 2004;18:190–5.
Li Q, Liang Z, Nakadai A, Kawada T. Effect of electric foot shock and psychological stress on activities of murine splenic natural killer and lymphokine-activated killer cells, cytotoxic T lymphocytes, natural killer receptors and mRNA transcripts for granzymes and perforin. Stress. 2005;8:107–16.
McClelland DC, Floor E, Davidson RJ, Saron C. Stressed power motivation, sympathetic activation, immune function, and illness. J Human Stress. 1980;6:11–9.
Park BJ, Tsunetsugu Y, Kasetani T, Hirano H, Kagawa T, Sato M, et al. Physiological effects of Shinrin-yoku (taking in the atmosphere of the forest)–using salivary cortisol and cerebral activity as indicators. J Physiol Anthropol. 2007;26:123–8.
Park BJ, Tsunetsugu Y, Ishii H, Furuhashi S, Hirano H, Kagawa T, et al. Physiological effects of Shinrin-yoku (taking in the atmosphere of the forest) in a mixed forest in Shinano Town, Japan. Scand J For Res. 2008;23:278–83.
Tsunetsugu Y, Park BJ, Ishii H, Hirano H, Kagawa T, Miyazaki Y. Physiological effects of Shinrin-yoku (taking in the atmosphere of the forest) in an old-growth broadleaf forest in Yamagata Prefecture, Japan. J Physiol Anthropol. 2007;26:135–42.
Mori H, Nishijo K, Kawamura H, Abo T. Unique immunomodulation by electro-acupuncture in humans possibly via stimulation of the autonomic nervous system. Neurosci Lett. 2002;320:21–4.