Is infrasound responsible?
Almost without exception infrasound exposure studies to date have been for the purposes of trying to establish if there are any adverse human health or performance implications in people who are exposed to infrasound in the workplace. These studies have all used pure tone infrasound at high or very high amplitudes or long exposure periods in their experimental design. Ambient infrasound from natural and man-made sources is almost without exception in the form of broadband noise comprising of fundamental notes, harmonics and resonant frequencies. The use of pure tones in all of the infrasound exposure studies may also result in misleading effects being reported. The data from the studies that have been carried is indicative of some physiological and psychological effects from prolonged exposure to high amplitude infrasound. These include cardio-vascular and respiratory effects (Karpova et al, 1970) and feelings of fatigue, apathy, depression and loss of concentration. In some instances,
