Why the study?
Does mental work load affect the heart rate variability spectrum?
Does mental work load affect the heart rate variability spectrum?
Mental work load induces consistent changes in the heart rate variability spectrum around 0.1 Hz, suggesting frequency selective analysis is more reliable than mean heart rate or variance.
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Mean HR may miss mental workload effects on HRV; extends frequency-domain insights but leaves open clinical validation.
Spontaneous variability of heart-rate has been related to three major physiological originating factors: quasi-oscillatory fluctuations thought to arise in blood-pressure control, variable frequency oscillations due to thermal regulation, and respiration; frequency selective analysis of cardiac interbeat interval sequences allows the separate contributions to be isolated. Using this method, a laboratory and field study of the effects of mental work load on the cardiac interval sequence has been carried Out. Results suggest that mean heart rate and variance are unreliable measures, but that consistent changes in interval spectrum occur; these have been traced to alterations mainly in the 0·1 Hz region, perhaps originating with changes in the patterns of respiration which interact with the 0·1 Hz vasomotor activity,
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B.McA. SAYKRS (1973) studied this question.
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