Protection from scrotal hyperthermia in laptop computer users

Objective: To evaluate methods of prevention of scrotal hyperthermia in laptop computer (LC) users. Design: Experimental study. Setting: University hospital. Patient(s): Twenty-nine healthy male volunteers. Intervention(s): Right and left scrotal temperature and LC and lap pad temperatures were recorded during three separate 60-minute sessions using a working LC in a laptop position: session 1, sitting with closely approximated legs; session 2, sitting with closely approximated legs with a lap pad below the working LC; and session 3, sitting with legs apart at a 70 degrees angle with a lap pad below the working LC. Main Outcome Measure(s): Scrotal temperature elevation. Result(s): Scrotal temperature increased significantly regardless of leg position or use of a lap pad. However, it was significantly lower in session 3 (1.41 degrees C +/- 0.66 degrees C on the left and 1.47 degrees C +/- 0.62 degrees C on the right) than in session 2 (2.18 degrees C +/- 0.69 degrees C and 2.06 degrees C +/- 0.72 degrees C) or session 1 (2.31 degrees C +/- 0.96 degrees C and 2.56 degrees C +/- 0.91 degrees C). A scrotal temperature elevation of 1 degrees C was reached at 11 minutes in session 1, 14 minutes in session 2, and 28 minutes in session 3. Conclusion(s): Sitting position with closely approximated legs is the major cause of scrotal hyperthermia. Scrotal shielding with a lap pad does not protect from scrotal temperature elevation. Prevention of scrotal hyperthermia in LC users presently is not feasible. However, scrotal hyperthermia may be reduced by a modified sitting position (legs apart) and significantly shorter use of LC. (Fertil Steril (R) 2011;95:647-51. (C) 2011 by American Society for Reproductive Medicine.)