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. 2015 Dec 19:34:43.
doi: 10.1186/s40101-015-0079-x.

Degree of exercise intensity during continuous chest compression in upper-body-trained individuals

Hisayoshi Ogata  1 , Ikuyo Fujimaru  2 , Takaharu Kondo  3
Affiliations

Degree of exercise intensity during continuous chest compression in upper-body-trained individuals

Hisayoshi Ogata et al. J Physiol Anthropol. .

Abstract

Background: Although chest-compression-only cardiopulmonary resuscitation (CCO-CPR) is recommended for lay bystanders, fatigue is easily produced during CCO-CPR. If CCO-CPR can be performed at a lower intensity of exercise, higher resistance to fatigue is expected. Since chest compression is considered to be a submaximal upper body exercise in a steady rhythm and since the unit of load for chest compression is expressed as work rate, we investigated the possibility that peak work rate of the upper body determines the level of exercise intensity during CCO-CPR.

Methods: Twelve sedentary individuals (group Se), 11 rugby players (group R), and 11 swimmers (group Sw) performed 10-min CCO-CPR, and heart rate (HR) and rating of perceived exertion (RPE) were measured as indices of exercise intensity. Multiple linear regression analysis was carried out to assess potential relationships of upper body weight, peak lumbar extension force, peak work rate, and peak oxygen uptake recorded during arm-crank exercise with HR and RPE during CCO-CPR.

Results: Values of peak work rate during arm-crank exercise (Peak WR-AC) in group Se, group R, and group Sw were 108 ± 12, 139 ± 27, and 146 ± 24 watts, respectively. Values of the latter two groups were significantly higher than the value of group Se (group R, P < 0.01; group Sw, P < 0.001). HR during CCO-CPR increased with time, reaching 127.8 ± 17.6, 114.8 ± 16.5, and 118.1 ± 14.2 bpm at the 10th minute in group Se, group R, and group Sw, respectively. On the other hand, RPE during CCO-CPR increased with time, reaching 16.4 ± 1.4, 15.4 ± 1.7, and 13.9 ± 2.2 at the 10th minute in group Se, group R, and group Sw, respectively. Multiple linear regression analysis showed that only peak WR-AC affects both HR and RPE at the 10th minute of CCO-CPR (HR, r = -0.458; P < 0.01; RPE, r = -0.384, P < 0.05).

Conclusions: The degree of exercise intensity during CCO-CPR is lower in individuals who have a higher peak work rate of the upper body.

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Figures

Fig. 1
Fig. 1
Comparisons of changes in work rate during 10-min chest compressions between groups. WR -CC work rate of chest compression
Fig. 2
Fig. 2
Comparisons of changes in heart rate and rating of perceived exertion during 10-min chest compression between groups. HR heart rate, RPE rating of perceived exertion. *P < 0.05, **P < 0.01, and ***P < 0.001, compared with the value at rest for HR. # P < 0.05, ## P < 0.01, and ### P < 0.001, compared with the value at the first minute of chest compression for RPE. a P < 0.05 and aa P < 0.01, between values in the group of sedentary individuals and the group of swimmers
Fig. 3
Fig. 3
Relationship between estimated work rate and heart rate during CCO-CPR. HR heart rate, WR -CC work rate of chest compression. Black, grey, and white circles represent sedentary individuals, rugby players, and swimmers, respectively
See this image and copyright information in PMC

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