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Changes of light intensity can shift many physiological parameters like heart rate variability(HRV). This study is to assess the effect of visual stimuli on cardiac autonomic activity using Heart RateVariability in middle aged males.Objectives: To determine the effect of visual stimuli on Heart Rate Variability in middle aged males.Materials and Methods: The effects of visual stimuli on cardiac autonomic activity using Heart RateVariability (HRV) was studied in 50 healthy middle aged males. Beat to beat R-R intervals werecontinuously recorded under closed eye condition (CEC) and the open eye condition (OEC). HRVfrequency domain parameters like LF nu, HF nu, LF/HF were obtained with the help of RMS polyrite– D version 3.0.11Results: The values of LF nu, HF nu and LF/HF for all the subjects under both the closed –eye condition(CEC) and open- eye condition (OEC) were obtained. Values of LF nu and LF/HF under CEC appear to besmaller than those OEC. The mean value of HF nu for under CEC was significantly greater ( when compared to OEC.Conclusion: The parasympathetic component of the cardiac autonomic activity increased during the closedeye condition when compared to the open eye condition.Keywords: OEC, CEC, LF/HF, Cardiac activity, AFT.

Study of effect of visual stimuli on heart rate variability in middle aged males