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Cardiovascular adjustments to high- and low-intensity exercise do not regulate temporary threshold shifts
1Department of Physical Education, Miami University, Oxford, Ohio.
Scandinavian Audiology
|January 1, 1992
Summary
Exposure to loud noise during exercise causes temporary hearing threshold shifts. These shifts are not affected by exercise intensity or associated cardiovascular changes like increased blood pressure and heart rate.
Area of Science:
- Auditory Science
- Exercise Physiology
- Occupational Health
Background:
- Occupational noise exposure is a significant risk factor for hearing loss.
- The impact of exercise on hearing sensitivity, particularly in noisy environments, requires further investigation.
- Cardiovascular responses during exercise may influence auditory function.
Purpose of the Study:
- To investigate the effects of noise exposure during cycling exercise on temporary threshold shifts (TTS).
- To determine if exercise intensity influences noise-induced TTS.
- To examine the role of cardiovascular changes (blood pressure, heart rate) in modulating TTS during exercise and noise exposure.
Main Methods:
- Sixteen adults performed 10-minute cycling sessions at low and high intensities.
- Noise exposure involved a 2000 Hz center frequency noise at 104 dB SPL.
- Temporary threshold shifts were measured at 3000, 4000, and 6000 Hz.
Main Results:
- Significant TTS occurred following noise exposure, irrespective of exercise intensity.
- Exercise alone (without noise) did not result in significant TTS.
- TTS magnitude was not influenced by exercise-induced increases in systolic blood pressure (14-40%) or heart rate (36-90%).
Conclusions:
- Noise exposure during exercise causes temporary hearing threshold shifts.
- Exercise intensity and associated cardiovascular responses do not appear to exacerbate noise-induced TTS.
- These findings suggest that non-cardiovascular systems may play a role in regulating hearing sensitivity during combined noise and exercise exposure.