Asahina M, Vichayanrat E, Low DA, Iodice V, Mathias CJ. Autonomic dysfunction in parkinsonian disorders: assessment and pathophysiology. J Neurol Neurosurg Psychiatry. 2013;84:674-80.
 Freeman R, Wieling W, Axelrod FB, Benditt DG, Benarroch E, Biaggioni I, et al. Consensus statement on the definition of orthostatic hypotension, neurally mediated syncope and the postural tachycardia syndrome. Auton Neurosci. 2011;161:46-8.
 Velseboer DC, de Haan RJ, Wieling W, Goldstein DS, de Bie RM. Prevalence of orthostatic hypotension in Parkinson's disease: A systematic review and meta-analysis. Parkinsonism Relat Disord. 2011.
 Low DA, da Nobrega AC, Mathias CJ. Exercise-induced hypotension in autonomic disorders. Auton Neurosci. 2012;171:66-78.
 Smith GD, Mathias CJ. Postural hypotension enhanced by exercise in patients with chronic autonomic failure. Qjm. 1995;88:251-6.
 Reuter I, Engelhardt M, Freiwaldt J, Baas, H. Exercise test in Parkinon's Disease. Clin Auton Res 1999;9:129-134.
 Werner WG, DiFrancisco-Donoghue J, Lamberg EM. Cardiovascular response to treadmill testing in Parkinson disease. J Neurol Phys Ther. 2006;30:68-73.
 DiFrancisco-Donoghue J, Elokda A, Lamberg EM, Bono N, Werner WG. Norepinephrine and cardiovascular responses to maximal exercise in Parkinson's disease on and off medication. Mov Disord. 2009;24:1773-8.
 Smith GD, Mathias CJ. Differences in cardiovascular responses to supine exercise and to standing after exercise in two clinical subgroups of Shy-Drager syndrome (multiple system atrophy). J Neurol Neurosurg Psychiatry. 1996;61:297-303.
 Ward CD, Gibb WR. Research diagnostic criteria for Parkinson's disease. Adv Neurol. 1990;53:245-9.