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J Exerc Rehabil. 2018 Jun 30;14(3):530-535. doi: 10.12965/jer.1836166.083. eCollection 2018 Jun.

Effect of knee positions on cardiac compression variables in cardiopulmonary resuscitation of rescuer; Manikin study.

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Department of Kinesiology, College of Natural Science, Jeju National University, Jeju, Korea.
Jeju Branch, Korea Lifesaving Association, Jeju, Korea.


The aim of the study was to analyze the effect of knee positions on cardiac compression variables in cardiopulmonary resuscitation (CPR) using the manikin. Adult with career of CPR instructor (n=9; mean age, 27.11±6.60 years; mean heights, 177.39±4.40 cm; mean weights, 69.45±14.85 kg) participated in the experiment, and each participant performed cardiac compression from two different knee positions. Cardiac compression was 30 times per minute for each position with order of position randomized. The results obtained from variables of cardiac compression force were composed of compression velocity, elapsed time, decay rate, and loading rate in maximum and minimum medial-lateral, anterior-posterior (AP), vertical direction respectively. The above variables in 20.3 cm of knee position showed effective result than that of 50 cm of knee position, while maximum AP compression force increased. Given the often predictable setting of sports and exercise rehabilitation related with cardiac arrest, CPR relative to change of knee position were significantly associated with more efficient cardiac compression variables. These data have significant implications for health services program in fields of sports and exercise rehabilitation.


Cardiac compression; Decay rate; Knee position; Loading rate; Manikin

Conflict of interest statement

CONFLICT OF INTEREST No potential conflict of interest relevant to this article was reported.

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