Key result
Conscious guinea pigs show nocturnal heart rate patterns but lack clear circadian HRV rhythmicity.
In guinea pigs, HRV spectral analysis indicates HF reflects parasympathetic activity and LF/HF reflects autonomic balance, but autonomic function lacks clear circadian rhythmicity.
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Guinea pig telemetry validates HRV bands but shows absent autonomic circadian rhythm; leaves open species-specific translation to human diurnal patterns.
AKITA et al. (2002) studied Normal guinea pigs. Autonomic blockade (atropine and propranolol) vs. Baseline/normal state was evaluated on Diurnal variations of autonomic nervous function (HF, LF, and LF/HF ratio). In conscious guinea pigs, heart rate showed nocturnal patterns, but high frequency, low frequency, and LF/HF ratio of heart rate variability showed no clear circadian rhythmicity.
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