Key result
Young strength athletes with high heart rates (60-80 bpm) had reduced global myocardial work efficiency compared to athletes with low heart rates and healthy controls.
Why the study?
To investigate differences in LV global and regional myocardial work in strength athletes with different heart rates using non-invasive LV pressure-strain loops and evaluate the effect on LV systolic function.
Does resting heart rate affect left ventricular myocardial work and systolic function in young strength athletes?
Cross-Sectional (n=80)
No
Does resting heart rate affect left ventricular myocardial work and systolic function in young strength athletes?
Young strength athletes with higher resting heart rates exhibit more impaired left ventricular contractile performance and reduced myocardial work efficiency compared to those with lower heart rates.
Answers are grounded in this paper and cite their sources.
Should not yet change practice in young strength athletes; leaves open causal effects of resting heart rate on myocardial work.
Objective: The present study aimed to investigate the difference in left ventricular (LV) global and regional myocardial (MW) of strength athletes with different heart rates (HR) through non-invasive LV pressure-strain loop (PSL) and further address the effect of athlete’s heart rate variability on the LV systolic function.Methods:Fifty young professional wrestlers were collected randomly and divided into two groups in accordance with their different HR: the low HR (45~60 bpm, n1=25) and the high HR (60~80 bpm, n2=25). Thirty individuals with gender- and age-matched healthy volunteers served as controls (n3=30). Global and regional MW parameters were evaluated using LV-PSL derived from speckle tracking echocardiography (STE) and brachial artery pressure, and then compared between the above three groups.Results:The indicators of global and regional MW did statistically significantly differ between the athlete and control groups. Peak strain dispersion (PSD) and global myocardial wasted work (GWW) increased while global myocardial work efficiency (GWE) reduced in LHR and HHR groups compared with the control group, and global myocardial work index (GWI), global myocardial constructive work (GCW), global longitudinal strain (GLS) decreased in LHR group (P＜0.05). In comparison to the LHR group, GWI, GCW, GWW, PSD increased in HHR group and GWE reduced (P＜0.05). According to the regional MW analysis, the mean regional myocardial work index (RMWI) increasing gradually from basal to apical levels were similar across the three groups and regional myocardial work efficiency (RMWE) did not. Multiple linear regression analysis indicated that the HR, posterior wall thickness (PWT), interventricular septal thickness (IVST), GLS, and PSD were correlated with GWE (b’= -0.247, -0.390, -0.370, 0.340, and -0.554, respectively, P＜0.05).Conclusions:The LV contractile performance was more impaired in young strength athletes with high heart rates and PSL can be used to assess LV GMW and RMW quantitatively and accurately in reflecting LV systolic function.
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Li et al. (2021) conducted a cross-sectional in Athlete's heart (n=80). High heart rate (60-80 bpm) vs. Low heart rate (45-60 bpm) and healthy controls was evaluated on Global myocardial work efficiency (GWE) (p=<0.001). Young strength athletes with high heart rates (60-80 bpm) had reduced global myocardial work efficiency compared to athletes with low heart rates and healthy controls.
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