Key result
Minimal ice water caloric stimulation of the right and left vestibular system did not affect the cardiac sympathovagal balance according to heart rate variability indices.
Why the study?
Caloric stimulation of the vestibular system triggers autonomic responses, but whether cardiac sympathovagal tone differs between right- and left-ear stimulation in healthy persons was unknown.
Does minimal ice water caloric stimulation affect cardiac sympathovagal balance in healthy male volunteers?
RCT (n=12)
Random sequence of right/left and optimum/pessimum positions
Does minimal ice water caloric stimulation affect cardiac sympathovagal balance in healthy male volunteers?
Minimal ice water caloric stimulation does not significantly alter cardiac sympathovagal balance as measured by HRV in healthy males.
Clinicians need not expect HRV shifts from this stimulus in healthy men; leaves open conventional caloric effects.
BACKGROUND: Caloric stimulation of the vestibular system is associated with autonomic response. The lateralization in the nervous system activities also involves the autonomic nervous system. AIM: To compare the effect of the right and left ear caloric test on the cardiac sympathovagal tone in healthy persons. METHODS: This self-control study was conducted on 12 healthy male volunteers. The minimal ice water caloric test was applied for vestibular stimulation. This was done by irrigating 1 milliliter of 4 ± 2 °C ice water into the external ear canal in 1 s. In each experiment, only one ear was stimulated. For each ear, the pessimum position was considered as sham control and the optimum position was set as caloric vestibular stimulation of horizontal semicircular channel. The order of right or left caloric vestibular stimulation and the sequence of optimum or pessimum head position in each set were random. The recovery time between each calorie test was 5 min. The short-term heart rate variability (HRV) was used for cardiac sympathovagal tone metrics. All variables were compared using the analysis of variance. The time of the start of the nystagmus following caloric vestibular stimulation had no differences in both sides and both positions. CONCLUSION: Minimal ice water caloric stimulation of the right and left vestibular system did not affect the cardiac sympathovagal balance according to HRV indices.
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Ziarati et al. (2020) conducted an RCT in Healthy (n=12). Minimal ice water caloric vestibular stimulation vs. Sham control (pessimum head position) was evaluated on Cardiac sympathovagal tone metrics (short-term heart rate variability). Minimal ice water caloric stimulation of the right and left vestibular system did not affect the cardiac sympathovagal balance according to heart rate variability indices.
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