Table 1 Settings for LED cluster

Number of LEDs

69 (34 red LEDs and 35 infrared LEDs)

Wavelength

660 nm (red) and 850 nm (infrared)

Frequency

Continuous output

Optical output

10 mW (red) and 30 mW (infrared)

LED spot size

0.2 cm² (for both), total spot sizes 13.8 cm²

Power density

0.05 W cm^-2 (red) and 0.15 W cm^-2 (infrared)

Energy

41.7 J (0.3 J from each red LED and 0.9 J from each infrared LED)

Energy density

1.5 J cm^-2 (red) and 4.5 J cm^-2 (infrared)

Treatment time

30 s per point, 120 s (total treatment time for isometric test), 420 s (total treatment time for dynamic test)

Number of irradiation points per muscle

4 points (isometric test) and 14 points (dynamic test)

Total energy delivered

166.8 J (isometric test), 583.8 J (dynamic test)

Application mode

Cluster held stationary to skin with slight pressure at a 90° angle