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Age dependency of cardiovascular autonomic responses to head-up tilt in healthy subjects.
Laitinen T, Niskanen L, Geelen G, Länsimies E, Hartikainen J. Laitinen T, et al. Among authors: hartikainen j. J Appl Physiol (1985). 2004 Jun;96(6):2333-40. doi: 10.1152/japplphysiol.00444.2003. Epub 2004 Feb 6. J Appl Physiol (1985). 2004. PMID: 14766788
Power spectral analysis of heart rate and blood pressure variability in anaesthetized dogs.
Hedman AE, Hartikainen JE, Tahvanainen KU, Hakumäki MO. Hedman AE, et al. Among authors: hartikainen je. Acta Physiol Scand. 1992 Oct;146(2):155-64. doi: 10.1111/j.1748-1716.1992.tb09404.x. Acta Physiol Scand. 1992. PMID: 1442131
Simultaneous invasive and noninvasive evaluations of baroreflex sensitivity with bolus phenylephrine technique.
Hartikainen JE, Tahvanainen KU, Mäntysaari MJ, Tikkanen PE, Länsimies EA, Airaksinen KE. Hartikainen JE, et al. Am Heart J. 1995 Aug;130(2):296-301. doi: 10.1016/0002-8703(95)90443-3. Am Heart J. 1995. PMID: 7631610 Clinical Trial.
The high frequency component of heart rate variability reflects cardiac parasympathetic modulation rather than parasympathetic 'tone'.
Hedman AE, Hartikainen JE, Tahvanainen KU, Hakumäki MO. Hedman AE, et al. Among authors: hartikainen je. Acta Physiol Scand. 1995 Nov;155(3):267-73. doi: 10.1111/j.1748-1716.1995.tb09973.x. Acta Physiol Scand. 1995. PMID: 8619324
Effect of sympathetic modulation and sympatho-vagal interaction on heart rate variability in anaesthetized dogs.
Hedman AE, Tahvanainen KU, Hartikainen JE, Hakumäki MO. Hedman AE, et al. Among authors: hartikainen je. Acta Physiol Scand. 1995 Oct;155(2):205-14. doi: 10.1111/j.1748-1716.1995.tb09965.x. Acta Physiol Scand. 1995. PMID: 8669293
Analogue and digital electrocardiogram recordings in the assessment of heart rate variability.
Simula SH, Laitinen T, Hartikainen JE. Simula SH, et al. Among authors: hartikainen je. Clin Physiol. 1998 Mar;18(2):157-66. doi: 10.1046/j.1365-2281.1998.00089.x. Clin Physiol. 1998. PMID: 9568355
Power spectral analysis of heart rate variability during hyperinsulinemia in nondiabetic offspring of type 2 diabetic patients: evidence for possible early autonomic dysfunction in insulin-resistant subjects.
Laitinen T, Vauhkonen IK, Niskanen LK, Hartikainen JE, Länsimies EA, Uusitupa MI, Laakso M. Laitinen T, et al. Among authors: hartikainen je. Diabetes. 1999 Jun;48(6):1295-9. doi: 10.2337/diabetes.48.6.1295. Diabetes. 1999. PMID: 10342819
Does postmenopausal hormone replacement therapy affect cardiac autonomic regulation in osteoporotic women?
Niskanen L, Laitinen T, Tuppurainen M, Saarikoski S, Kröger H, Alhava E, Hartikainen J. Niskanen L, et al. Among authors: hartikainen j. Menopause. 2002 Jan-Feb;9(1):52-7. doi: 10.1097/00042192-200201000-00008. Menopause. 2002. PMID: 11791086 Clinical Trial.
Cardiac adrenergic innervation is affected in asymptomatic subjects with very early stage of coronary artery disease.
Simula S, Vanninen E, Viitanen L, Kareinen A, Lehto S, Pajunen P, Syvänne M, Kuikka J, Laakso M, Hartikainen J. Simula S, et al. Among authors: hartikainen j. J Nucl Med. 2002 Jan;43(1):1-7. J Nucl Med. 2002. PMID: 11801695
Gender influence on vasoactive hormones at rest and during a 70 degrees head-up tilt in healthy humans.
Geelen G, Laitinen T, Hartikainen J, Länsimies E, Bergström K, Niskanen L. Geelen G, et al. Among authors: hartikainen j. J Appl Physiol (1985). 2002 Apr;92(4):1401-8. doi: 10.1152/japplphysiol.00548.2001. J Appl Physiol (1985). 2002. PMID: 11896003
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