Abstract

Driving is a hazardous occupation and the drivers exposed to this profession undergo autonomic changes. HRV, the non-invasive technique is used to assess the autonomic adjustment in the cardio vascular system is used to assess the stress induced autonomic modulation in drivers. The time and frequency domain of HRV were recorded in 61 truck drivers in normal and deep breathing condition. The result of time domain of HRV showed that HRV decreased with experience. Also while the LF component increases with experience, the HF component decreases. Thus the results indicate that as the duration of driving increased the sympathetic activity increased and parasympathetic activity decreased.

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