The effect of the low level laser irradiation on the human sperm motility

Sperm motility is known as an effective parameter in male fertility, and it depends on energy consumption. Low-level laser irradiation could increase energy supply to the cell by producing adenosine triphosphate. The purpose of this study is to evaluate the effect of the low-level laser irradiation on the human sperm motility. Fresh human semen specimens were divided into two equal portions and irradiated by 632.8 nm He-Ne laser irradiation with varying doses as: 0 (control) and 12 J/cm2. At the times of 30 min following irradiation, sperm motilities were assessed by means of computer-aided sperm analysis in all samples. results showed that the irradiating human sperms with low-level 632.8 nm He-Ne laser can improve their progressive motility depending on both laser density and post-exposure time