Published on:
    Journal of Cardiovascular Disease Research, 2011; 2(4):233-236
    Original Article | doi:10.4103/0975-3583.89808

    Cardio-pulmonary fitness test by ultra-short heart rate variability


    Arsalan Aslani, Amir Aslani1, Jalal Kheirkhah2, Vahid Sobhani

    Sport Physiology Research Center, Baghiyatallah University of Medical Sciences, Tehran, Iran

    1Cardiovascular Research Center, Shiraz University of Medical Sciences, Shiraz, Iran,

    2Gilan University of Medical Sciences, Gilan, Iran


    Objectives: It is known that exercise induces cardio-respiratory autonomic modulation. The aim of this study was to assess the cardio-pulmonary fitness by ultra-short heart rate variability. Materials and Methods: Study population was divided into 3 groups: Group-1 (n = 40) consisted of military sports man. Group-2 (n = 40) were healthy age-matched sedentary male subjects with normal body mass index [BMI = 19 - 25 kg/m 2 ). Group-3 (n = 40) were healthy age-matched obese male subjects [BMI > 29 kg/m 2 ). Standard deviation of normal-to-normal QRS intervals (SDNN) was recorded over 15 minutes. Bruce protocol treadmill test was used; and, maximum oxygen consumption (VO 2max) was calculated. Results: When the study population was divided into quartiles of SDNN (first quartile: < 60 msec; second quartile: > 60 and < 100 msec; third quartile: > 100 and <140 msec; and fourth quartile: >140 msec), progressive increase was found in VO 2max; and, SDNN was significantly linked with estimated VO 2max. Conclusion: In conclusion, the results of this study demonstrate that exercise training improves cardio-respiratory autonomic function (and increases heart rate variability). Improvement in cardio-respiratory autonomic function seems to translate into a lower rate of long term mortality. Ultra-short heart rate variability is a simple cardio-pulmonary fitness test which just requires 15 minutes, and involves no exercise such as in the treadmill or cycle test.

    Key words: Exercise, fitness, heart rate variability, standard deviation of normal-to-normal QRS intervals.