Cardiopulmonary responses to eccentric and concentric resistance exercise in older adults.

Abstract:

BACKGROUND:In older ambulatory persons, exercise strategies that are expected to generate beneficial muscle adaptations with low cardiopulmonary demands are needed. OBJECTIVE:We hypothesised that eccentric resistance exercise would be less demanding on the cardiovascular and pulmonary systems than bouts of concentric resistance exercise. DESIGN:The effects of eccentric and concentric resistance exercise were compared during leg squats at a submaximal intensity known to increase muscle mass. SUBJECTS:19 Older persons (15 women/four men, age 65 +/- 4 years) and 19 young reference controls (10 women/nine men; age 25 +/- 2 years) were enrolled. METHODS:Participants completed eccentric-only and concentric-only exercise bouts 5-7 days apart. RESULTS:Cardiovascular and pulmonary measures were collected from subjects during bouts consisting of three sequential sets of 10 repetitions at 65% of their voluntary concentric 1-repetition maximum force (68+/-16 kg for older participants and 94 +/- 36 kg for young participants). Peak heart rate (119 +/- 10 versus 155 +/- 16 b.p.m.), systolic blood pressure (129 +/- 18 versus 167 +/- 14 mmHg), cardiac index (7.8 +/- 2.0 versus 9.2 +/- 1.5 l/min/m2) and expired ventilation (20.5 +/- 5.7 versus 29.8 +/- 9.1 l/min) were significantly lower during eccentric than during concentric bouts in the older subjects, respectively (P < 0.001 for all comparisons). Similarly, peak heart rate, systolic blood pressure, cardiac index and expired ventilation were significantly lower during eccentric bouts in the young control subjects. CONCLUSIONS:Eccentric resistance exercise produced less cardiopulmonary demands and may be better suited for older persons with low exercise tolerance and at risk of adverse cardiopulmonary events.

journal_name

Age Ageing

journal_title

Age and ageing

authors

Vallejo AF,Schroeder ET,Zheng L,Jensky NE,Sattler FR

doi

10.1093/ageing/afj082

subject

Has Abstract

pub_date

2006-05-01 00:00:00

pages

291-7

issue

3

eissn

0002-0729

issn

1468-2834

pii

35/3/291

journal_volume

35

pub_type

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