1Associate Professor, SDMCMS & H, Dharwad, Karnataka
2Assistant Professor, Dept. of Physiology, Chamarajanagar Institute of Medical Sciences, Chamarajanagar, Karnataka
3Professor & HOD, SDMCMS & H, Dharwad, Karnataka
*Corresponding Author: Email: drlakshmi26@yahoo.com
Online published on 14 June, 2017.
Exercise intolerance is typical characteristic of the subclinical hypothyroidism.
Evaluation of heart rate responses to sub maximal exercise in subclinical hypothyroidism.
Twenty three subclinical hypothyroids and thirty age, sex and BMI matched euthyroid controls were selected. Sub maximal exercise was performed using Bruce protocol using 75% target heart rate in treadmill. Heart rate recovery to sub maximal exercise was done using ECG lead II.
Compared to Euthyroid controls, Subclinical Hypothyroidism (SCH) show a significant increase in warm up period heart rate. (p=0.05). There is a significant increase in the heart rate during recovery period at both 1st and 2nd minute in SCH when compared to controls. (p=0.03, 0.01), negative correlation exist between TSH level and 1st minute heart rate recovery.
We conclude that subjects with Subclinical hypothyroidism, shows a delayed heart rate recovery in response to a sub maximal exercise.
Parasympathetic tones, Basal metabolic rate, Physical Exertion, Exercise tolerance, Hypothyroidism
