Abstract
Background
It has been hypothesized that body mass index (BMI) and muscle strength (MS) of the
rescuers are predictors of adequate external chest compressions (ECC). The aims of
this study were: (a) to analyze, in college students, the relationship between BMI and MS with adequate
ECC parameters; and (b) to examine whether the association between BMI and adequate ECC parameters is mediated
by MS.
Methods
A cross-sectional analysis of the evaluation of a CPR performance test involving students
(n = 63). We determined BMI and MS. After previous training, participants performed cardiopulmonary
resuscitation on a mannequin for 20 minutes. PROCESS macro developed by Preacher and
Hayes was used to assess whether the association between BMI and ECC was mediated
by MS.
Results
Underweight subjects achieved lower results than those with normal weight and overweight/obese
in several dependent variables including: correct compression depth (P < .001) and adequate ECC (P < .001). This differences remained after adjusting for muscle strength except for the
compression rate (P = .053). Moreover, participants in the low MS quartile were lower in both correct compression
depth (P = .001) and adequate ECC (P < .001) than participants in the medium/high quartile after adjusting for confounding
variables. The effect of BMI on adequate ECC was partially mediated by MS. Similar
results were obtained in the analysis of the mediator role of MS in the relationship
between BMI and correct compression depth.
Conclusions
The ability to provide adequate ECC is influenced by the rescuer's MS. Rescuers should
be advised to exercise arm strength to improve the quality of CPR.
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Article Info
Publication History
Published online: June 15, 2016
Accepted:
June 13,
2016
Received in revised form:
June 13,
2016
Received:
April 7,
2016
Footnotes
☆Author's contribution: All authors have made substantial contributions to all of the following: (1) the conception and design of the study, or acquisition of data, or analysis and interpretation of data; (2) drafting the article or revising it critically for important intellectual content; (3) final approval of the version to be submitted.
Identification
Copyright
© 2016 Elsevier Inc. All rights reserved.
