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Effects of concentric vs eccentric loading on cardiovascular variables and ECG
Bhavna, Madan & Sarika, Sandhu J.S
Abstract
There is a paucity of information concerning the cardiovascular responses and adaptations to
strength training. Limited evidence suggest that which particular type of resistance exercise
could be more tolerable as well as potentially safer for people with cardiac diseases or
impairments. So, the aim of study was to determine and compare the effect of concentric and
eccentric loading on cardiovascular variables and ECG. 20 Young healthy students (mean age 20
± 4 years) participated and were randomly divided into two groups- Experimental & Control. Pre
& Post training readings were taken for following Parameters –Heart Rate, Blood Pressure, Mean
Arterial Pressure, Rate Pressure Product and ECG. At first testing bout, participants performed
concentric exercises (at 75% of 10 RM). Participants returned 10 days after the first session
to perform exercises using the eccentric contraction type. Related ‘t’ test and one way ANOVA
was applied for statistical analysis between groups. Cardiovascular measures collected from
subjects were significantly lower during eccentric than during concentric bouts in all subjects
(p<0.01) and ECG showed no significant changes after both training protocols (p>0.05). So,
it can be concluded that since eccentric exercise produces less cardiopulmonary demands
so are more suitable for persons with low exercise tolerance, who are at the risk of adverse
cardiopulmonary events and for improving and maintaining cardiac fitness.
Keywords
Eccentric Exercise; Concentric Exercise; ECG; Cardiopulmonary demands; Young population
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