J Psychosom Res 52:257–266. doi:10.​1016/​S0022-3999(02)00298-2 PubMedCrossRef Pardo Y, Merz CN, Paul-Labrador M, Velasquez I, Gottdiener JS, Kop WJ, Krantz DS, Rozanski A, Klein J, Peter T (1996) Heart rate variability reproducibility and stability using commercially available equipment in coronary artery disease with

daily life myocardial ischemia. Am J Cardiol 78:866–870. doi:10.​1016/​S0002-9149(96)00458-4 PubMedCrossRef Pitzalis MV, VX-680 Mastropasqua F, Massari F, Forleo C, Di MM, Passantino A, Colombo R, Di Biase M, Rizzon P (1996) Short- and long-term reproducibility of time and frequency domain heart rate variability measurements in normal subjects. Cardiovasc Res 32:226–233. doi:10.​1016/​0008-6363(96)00086-7 PubMedCrossRef Reeves WC, Wagner D, Nisenbaum R, Jones JF, Gurbaxani B, Solomon L, Papanicolaou DA, Unger ER, Vernon SD, Heim C (2005) Chronic fatigue syndrome—a clinically empirical approach to its definition and study. BMC Med 3:19. doi:10.​1186/​1741-7015-3-19 PubMedCrossRef Ruha A, Sallinen S, Nissila S (1997) A PD0332991 price real-time microprocessor QRS detector system with a 1-ms timing accuracy for the selleck kinase inhibitor measurement of ambulatory HRV. IEEE Trans Biomed Eng 44:159–167. doi:10.​1109/​10.​554762

PubMedCrossRef Sandercock GR, Bromley P, Brodie DA (2004) Reliability of three commercially available heart rate variability instruments using short-term (5-min) Dipeptidyl peptidase recordings. Clin Physiol Funct Imag 24:359–367. doi:10.​1111/​j.​1475-097X.​2004.​00584.​x CrossRef Sandercock GR, Bromley PD, Brodie DA (2005a) Effects of exercise on heart rate variability: inferences from meta-analysis. Med Sci Sports Exerc 37:433–439. doi:10.​1249/​01.​MSS.​0000155388.​39002.​9D PubMedCrossRef Sandercock GR, Bromley PD, Brodie DA (2005b) The reliability of short-term measurements of heart rate variability. Int J Cardiol 103:238–247. doi:10.​1016/​j.​ijcard.​2004.​09.​013 PubMedCrossRef Schmaling K, Hamilos DL, DiClementi JD, Jones JF (1998) Pain perception in chronic fatigue syndrome. J Chronic Fatigue Syndr 4:13–22. doi:10.​1300/​J092v04n03_​03

CrossRef Schroeder EB, Whitsel EA, Evans GW, Prineas RJ, Chambless LE, Heiss G (2004) Repeatability of heart rate variability measures. J Electrocardiol 37:163–172. doi:10.​1016/​j.​jelectrocard.​2004.​04.​004 PubMedCrossRef Shrout PE, Fleiss JL (2006) Intraclass correlations: uses in assessing rater reliability. Psychol Bull 86:420–428. doi:10.​1037/​0033-2909.​86.​2.​420 CrossRef Sinnreich R, Kark JD, Friedlander Y, Sapoznikov D, Luria MH (1998) Five minute recordings of heart rate variability for population studies: repeatability and age–sex characteristics. Heart 80:156–162PubMed Stein PK, Rich MW, Rottman JN, Kleiger RE (1995) Stability of index of heart rate variability in patients with congestive heart failure. Am Heart J 129:975–981. doi:10.