Testicular ergonomics: whole-body vibration, mechanotransduction, and male reproductive health in heavy machinery operators.

Whole-body vibration (WBV) is a common occupational exposure among heavy machinery operators and has traditionally been investigated in relation to musculoskeletal, spinal, and neurological disorders. However, its potential impact on male reproductive health remains insufficiently characterized. This narrative review critically evaluates current occupational, experimental, and mechanobiological evidence concerning the potential association between chronic WBV exposure and male reproductive dysfunction. Particular attention is given to mechanotransduction and its potential interaction with oxidative stress, mitochondrial dysfunction, microvascular alterations, blood-testis barrier disruption, inflammation, endocrine alterations, and impaired spermatogenesis. Available evidence suggests biological plausibility but remains heterogeneous and insufficient to establish a causal relationship between occupational WBV and male infertility. We introduce the concept of Testicular Ergonomics as a hypothesis-generating framework for integrating male reproductive health into occupational vibration research and prevention. This framework emphasizes improved vibration exposure assessment, engineering and administrative controls, and standardized reproductive-health evaluation while accounting for relevant occupational and lifestyle confounders. Future prospective human and mechanistic studies integrating standardized WBV measurements with reproductive and molecular outcomes are required to determine whether chronic occupational vibration represents an independent risk to male reproductive health and to inform evidence-based preventive strategies.