Table 2. Treatment Parameters for Each Group .

Group	Dose	Wavelength	Frequency	Power
A	6 J/cm2	660 nm 800 nm 905 nm 970 nm	CW 50 Hz 5000 Hz 20000 Hz	2 W Pa 4 W Pp
B	2 J/cm2
C	Placebo: 5 mW, 660 nm

CW, continuous wave; Pa, average power; Pp, peak power.