The baseline characteristics of the participants, including their medication use, were very similar between the groups, with only slightly greater height and weight in the loaded breathing group. The pre-training cardiovascular parameters were very similar in the three groups. The threshold loading device is very suitable for home use and has the advantage that the selleckchem air is humidified – avoiding the unpleasant dry mouth and throat normally associated
with breathing through a mouthpiece. Such a relatively simple and inexpensive device could therefore be a valuable adjunct to conventional approaches for treatment of hypertension in all communities. Although participants and assessors were not blinded, participants were not informed that there were loaded and unloaded breathing groups, so this may have reduced some sources of bias due to lack of blinding on this comparison. The potential problems of an unblinded
study were further minimised by the nature of the measurements since blood pressure and heart rate were recorded automatically and required no particular skill or judgments to be made either by the participants at home or the experimenters in the laboratory (Wood et al 2008). Furthermore, the post-training measurements were all made without either the participants or the experimenters having access to the pretraining data measured some eight weeks earlier. The consequences of unloaded breathing training for either systolic GSK1120212 mouse and diastolic blood pressure were very similar to previous reports where breathing has been regulated in various ways (Schein et al 2001, Grossman et al 2001, Rosenthal et al 2001, Elliot et al 2002, Viskoper et al 2003), with the mean changes being 6 to 10 mmHg for systolic and diastolic
blood pressure for all the trials, including the present one. The reductions in blood pressure achieved in this way are clinically valuable and appreciably greater than those reported for aerobic physical training reductions of 3.8 and 2.6 mmHg for systolic and diastolic blood pressure (Whelton et al 2002) which is generally recommended as an adjunct to treatment for hypertension. It is of particular interest that both training modes reduced systolic blood pressure and pulse pressure. Systolic blood pressure is considered a better predictor of cardiovascular complications than diastolic blood pressure (Lewington et al 2002). It has recently been suggested that systolic blood pressure should be the target of treatment in people aged over 50 years with hypertension (Williams et al 2008) but controlling systolic blood pressure with pharmacological measures is more difficult than controlling diastolic blood pressure (Waeber and Mourad, 2006).
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