Using wavelet analysis to characterize effects of different head positions on blood flow

Poor postures not only affect the neck muscles and make the shoulder stiff, but also may induce a burden for cardiovascular system. Laser Doppler flowmetry (LDF) was used to measure real-time cutaneous blood perfusion. This present study aimed to examine the effect of different head positions on skin blood flow and use of Morlet wavelet to process Doppler blood flow signals for blood flow measurements. Three mechanical neck pain volunteers (2men and 1 women, age: 22.1plusmn2.3 year) were recruited. Five head positions were tested: neck neutral(NL), full neck extension, full neck flexion, right rotation, left rotation. Sympathetic nerve may more activity at neck extension position than other positions (p>0.05). Head and neck positions may have effect on sympathetic activity and skin blood flow modulation.