Key result
The commentary argues that the LF/HF ratio derived from photoplethysmography does not accurately reflect sympathetic nerve activity during cold stress due to confounding by respiratory frequency.
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Ackermann et al. (2021) conducted an editorial in Sympathetic Nerve Activity assessment. Photoplethysmography (PPG) was evaluated. The commentary argues that the LF/HF ratio derived from photoplethysmography does not accurately reflect sympathetic nerve activity during cold stress due to confounding by respiratory frequency.
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