Product of Heart Rate and First Heart Sound Amplitude as an Index of Myocardial Metabolic Stress During Graded Exercise

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概要

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• Background: The double product (DP) breakpoint of heart rate (HR) and systolic blood pressure has been identified as coincident with anaerobic threshold (AT), but there are no simple methods for measuring cardiac metabolic stress (CMS) during an exercise test. It was hypothesized that the DP of HR and the amplitude of the first heart sound (AHS1) (DP-AHS1) would reflect CMS, and thus, the breakpoint in the DP-AHS1 (DPBP-AHS1) could be an alternative method for determining AT. Methods and Results: Subjects (age range, 18–73 years) were recruited to perform a graded exercise test on a cycle ergometer with continuous monitoring of DP-AHS1, with left ventricular pressure (LVP; experiment 1, Ex1), plasma catecholamine and blood lactate (experiment 2, Ex2) and gas exchange (experiment 3, Ex3). Ex1: in all subjects there was a strong correlation between AHS1 and LVdP/dtmax (r=0.94–0.98), and between the DP-AHS1 and the triple product of HR, LVdP/dtmax, and max LVP (r=0.98–0.99). Ex2: DP-AHS1 was strongly correlated with adrenaline (r=0.97–1.00) and lactate (r=0.96–1.00) levels in all subjects. Ex3: there was a strong correlation between DPBP-AHS1, AT and maximum oxygen consumption. Conclusions: The present simple measure of DP-AHS1 can reflect plasma adrenaline and lactate levels during graded exercise testing. Further, DPBP-AHS1 is a surrogate marker of AT and a good index of functional aerobic capacity.

著者

• Brubaker Peter

  Department Of Health And Exercise Science Wake Forest University

• Obara Shigeru

  Faculty Of Integrated Arts And Science University Of Tokushima

• Tanaka Hiroaki

  Fukuoka University

• Kiyonaga Akira

  Fukuoka University Faculty Of Sports Science

• Tobina Takuro

  Fukuoka University

• Higaki Yasuki

  Fukuoka University Institute for Physical Activity, Faculty of Sports and Health Science, Fukuoka University

• Yamada Yousuke

  Fukuoka University Institute for Physical Activity, Faculty of Sports and Health Science, Fukuoka University

• Matsuda Takuro

  Fukuoka University Institute for Physical Activity, Faculty of Sports and Health Science, Fukuoka University

• Yamagishi Tamiharu

  Nagasaki Heart Clinic

• Sakai Hideaki

  Nagasaki Heart Clinic

• Tanaka Hiroaki

  Fukuoka University Institute for Physical Activity, Faculty of Sports and Health Science, Fukuoka University

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