The sleep apnoea/hypopnoea syndrome depresses waking vagal tone independent of sympathetic activation
M.F. Hilton, M.J. Chappell, W.A. Bartlett, A. Malhotra, J.M. Beattie, R.M. Cayton
European Respiratory Journal 2001 17: 1258-1266; DOI: 10.1183/09031936.01.00009301