Index to Chiropractic Literature
Index to Chiropractic Literature
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ID 24683
  Title A calibrated method of massage therapy decreases systolic blood pressure concomitant with changes in heart rate variability in male rats
Journal J Manipulative Physiol Ther. 2017 Feb;40(2):77-88
Peer Review Yes
Publication Type Article

Objective: The purpose of this study was to develop a method for applying calibrated manual massage pressures by using commonly available, inexpensive sphygmomanometer parts and validate the use of this approach as a quantitative method of applying massage therapy to rodents.

Methods: Massage pressures were monitored by using a modified neonatal blood pressure (BP) cuff attached to an aneroid gauge. Lightly anesthetized rats were stroked on the ventral abdomen for 5 minutes at pressures of 20 mm Hg and 40 mm Hg. Blood pressure was monitored noninvasively for 20 minutes following massage therapy at 5-minute intervals. Interexaminer reliability was assessed by applying 20 mm Hg and 40 mm Hg pressures to a digital scale in the presence or absence of the pressure gauge.

Results: With the use of this method, we observed good interexaminer reliability, with intraclass coefficients of 0.989 versus 0.624 in blinded controls. In Long-Evans rats, systolic BP dropped by an average of 9.86% ± 0.27% following application of 40 mm Hg massage pressure. Similar effects were seen following 20 mm Hg pressure (6.52% ± 1.7%), although latency to effect was greater than at 40 mm Hg. Sprague-Dawley rats behaved similarly to Long-Evans rats. Low-frequency/high-frequency ratio, a widely-used index of autonomic tone in cardiovascular regulation, showed a significant increase within 5 minutes after 40 mm Hg massage pressure was applied.

Conclusions: The calibrated massage method was shown to be a reproducible method for applying massage pressures in rodents and lowering BP.

Author keywords: Musculoskeletal Manipulations, Sprague-Dawley Rat, Long-Evans Rat, Diastolic Blood Pressure, Stress, Sympathetic Nervous System, Parasympathetic Tone

This abstract is reproduced with the permission of the publisher; click on the above link for free full text.

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