Spermatogenesis is a continuous process, requiring approximately 64 to 74 days to produce a batch of sperm in the testes. Following this, sperm mature in function and motility within the epididymis for about 10 to 14 days.

Doctor Dang Tuan Anh, from the Center for Reproductive Support at Tam Anh General Hospital Hanoi, states that prolonged motorcycle riding under sunny conditions causes heat from the environment, engine, and seat surface to accumulate around the scrotal area, impacting sperm production. The testes require a temperature two to 4 degrees Celsius lower than body temperature for normal spermatogenesis. Frequent exposure to high temperatures disrupts this thermoregulation mechanism. This condition can increase oxidative stress, damaging spermatogenic cells and sperm DNA, leading to a decline in semen quality over time.

High temperatures increase the production of free radicals, which damage sperm membranes and genetic material. This not only impairs fertilization ability but can also lead to poor embryo development.

Beyond temperature, dehydration from spending many hours in the sun can also affect reproductive health. When the body lacks water, blood circulation and metabolic activity are impacted, indirectly influencing the testicular nourishing environment.

This situation is particularly concerning for men who spend many hours daily riding vehicles, such as ride-hailing drivers, delivery personnel, or those who frequently travel outdoors. Heat accumulation in the groin area, combined with prolonged sitting, affects blood circulation around the testes. Some individuals may experience a burning sensation, discomfort, scrotal pain, or fatigue after many hours of outdoor travel.

A Tam Anh IVF doctor consults a male infertility patient due to weak sperm. *Illustration: Tam Anh General Hospital*

Besides motorcycles, prolonged sitting in cars under hot sun, regularly placing laptops on laps, extended hot water immersion, or continuous sauna use can also create similar heating effects on the testes.

Many individuals maintain normal daily activities before discovering reduced semen quality during infertility examinations. Doctor Tuan Anh notes that many young men with weak sperm have lifestyles involving frequent exposure to high heat, late nights, smoking, and prolonged stress.

Doctors advise men to limit continuous sitting on vehicles for extended periods in hot weather. For long-distance travel, breaks should be taken to allow the body and groin area to dissipate heat. Avoid wearing overly tight or non-breathable clothing when spending many hours outdoors in the heat. Ride-hailing drivers or outdoor workers can use heat-resistant seat covers, prioritize breathable clothing, and ensure adequate hydration throughout the day. After prolonged sun exposure, it is advisable to rest in a cool place before continuing travel.

Men planning to conceive or undergoing infertility treatment should particularly avoid factors that increase testicular temperature. If experiencing persistent scrotal pain, a burning sensation in the groin, reduced libido, or delayed conception after one year of regular unprotected intercourse, it is advisable to seek examination for sperm quality assessment.

Thanh Ba