Associations between occupation exposure to Formaldehyde and semen quality, a primary study

Area of Science:

• Environmental Health
• Reproductive Toxicology
• Occupational Medicine

Background:

• Formaldehyde (FA) is a common environmental pollutant with suspected male reproductive toxicity.
• Previous human studies on FA's reproductive effects are limited, leading to inconclusive evidence.
• Understanding the impact of occupational FA exposure on male fertility is crucial.

Purpose of the Study:

• To investigate the association between occupational formaldehyde exposure and semen quality in male workers.
• To compare semen parameters between workers exposed to formaldehyde and unexposed referents.
• To quantify the risk of abnormal semen parameters associated with formaldehyde exposure levels.

Main Methods:

• A comparative study involving 114 male workers occupationally exposed to formaldehyde and 76 referents.
• Assessment of semen quality, including five conventional and seven kinematic parameters.
• Measurement and calculation of a formaldehyde exposure index (FEI) for each worker.

Main Results:

• Workers exposed to formaldehyde showed statistically significant decreases in sperm progressive motility, total sperm motility, VCL, VSL, and VAP compared to referents.
• The formaldehyde exposure index (FEI) was negatively correlated with sperm progressive motility and total sperm motility.
• Increased risks of abnormal sperm progressive motility and total sperm motility were observed in both low- and high-exposure groups.

Conclusions:

• Occupational exposure to formaldehyde adversely affects semen quality, particularly sperm motion parameters.
• Formaldehyde exposure is linked to reduced sperm motility and an elevated risk of abnormal sperm parameters.
• This study provides human evidence of formaldehyde's detrimental impact on male reproductive health.