ISSN 0975-3583
 

Journal of Cardiovascular Disease Research



    CARDIAC OUTPUT CHANGES IN SUBMAXIMAL EXERCISE IN YOUNG INDIAN ADULTS


    Dr P.T. SELVARAJ
    JCDR. 2023: 16-26

    Abstract

    Aim of the current study is to measure cardiac output before and after submaximal exercise test on treadmill in physically healthy but untrained young Indian adult males. Study also determine the relative contributions of stroke volume heart rate in the raising cardiac output in such strong group. Method: This cross sectional study was conducted among 15 adults in the age group of 17-30 years. Heart rate, SBP, DBP, LVET, stroke volume, and cardiac output were measured before and after submaximal exercise test, and the results were correlated. Results: The mean heart rate was 71.86(57 -91 bpm) at rest, with exercise, it rose to 134.8 bpm, with an increase of 62bpm (87.6%). The difference of heart rate between rest, and exercise was statistically significant (p<0.0001).The mean SBP at rest was 74.27mm Hg, with exercise, it rose to 139.67 mm Hg, with a mean rise of 26.14 mmHg (p<0.0001). The mean DBP at rest was 113.53mm Hg, and with exercise, it rose to 84.53mm Hg (p<0.0001).The mean LVET at rest was 253.67 with range of 223-320 msec. This range was correlated with the resting heart rate range of 57-91 bpm. However the ejection time for similar rates were different in some subjects. With exercise, LVET shows a decline of 36.14 msec to 217 msec, a drop of 15.3% and at the rest ejection time for a given heart rate was different for some subjects. The mean stroke volume at the rest was 69.26 ml and at exercise, it shows a decrease by 9.58 of 13.83% (P<0.0001). The mean cardiac output at the rest was 4.91 L/min and at exercise, and it was 7.99L/min with a significant increase of 62% (P<0.0001). The cardiac index rose to 4.78L/min/m2 during exercise showing an increase by 1.84L/min/m2(62.32%). A Positive significant correlation observed between the resting and exercise values of heart rate and cardiac output (r=+0.73, p<0.0001). A Positive significant correlation observed between the resting and exercise values of LVET and stroke volume(r=+0.99, p<0.0001). A negative significant correlation observed between the resting and exercise values of heart rate and LVET (r= -0.11, p<0.0001). A negative significant correlation observed between the resting and exercise values of stroke and cardiac output (r= -0.26, p<0.0001). A negative significant correlation observed between the resting and exercise values of cardiac output and LVET (r= -0.77, p<0.0001), indicates high significant. Conclusion: Young physically healthy but untrained group of individuals respondent to Submaximal exercise test with increased cardiac output of 62% predominately due to an increased heart rate and fall in stroke volume. Rise in heart rate compromised the venous return and coupled with a poor contractile reserve due to reduced tolerance to exercise the group showed a reduction in the stroke volume and in the duration of ejection

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    Volume & Issue

    Volume 14 Issue 4

    Keywords