Scrotal temperature is increased in disposable plastic lined nappies

Area of Science:

• Reproductive Health
• Pediatric Health
• Environmental Health

Background:

• Male reproductive health has seen a recent decline.
• Increased testicular temperature in early childhood is a potential contributing factor.
• Modern disposable plastic-lined nappies (diapers) may elevate scrotal temperature.

Purpose of the Study:

• To investigate the impact of disposable plastic-lined nappies versus cotton nappies on scrotal temperature in young children.
• To assess if nappy type influences the physiological testicular cooling mechanism.

Main Methods:

• Non-invasive scrotal skin temperature measurements were taken in 48 children aged 0-55 months.
• Temperature was recorded over two 24-hour periods using portable recorders, with participants randomly assigned to wear either cotton or disposable plastic-lined nappies.
• Data from 2880 measurements were analyzed across three age groups.

Main Results:

• Mean 24-hour scrotal temperature was significantly higher with disposable plastic-lined nappies compared to cotton nappies across all age groups (p < 0.001).
• The rectoscrotal temperature difference was significantly greater with cotton nappy use than with plastic nappy use (p < 0.01).
• The physiological testicular cooling mechanism was blunted or abolished during plastic nappy use.

Conclusions:

• Increased scrotal temperature, reflecting testicular temperature, is associated with the use of disposable plastic-lined nappies in young boys.
• The findings suggest that disposable nappies impair the natural cooling mechanism essential for spermatogenesis.
• Further research is warranted on the long-term effects of infant testicular hyperthermia on later fertility.