Heart rate and blood pressure responses to isometric exercise in young and older men |
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Authors: | J Smolander T Aminoff I Korhonen M Tervo N Shen O Korhonen and V Louhevaara |
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Institution: | (1) The Unit for Work Physiology Research, Department of Physiology, Finnish Institute of Occupational Health, Laajaniityntie 1, FIN-01620, Vantaa, Finland, FI;(2) VTT Information Technology, Tampere, Finland, FI;(3) Regional Institute of Occupational Health and University of Kuopio, Kuopio, Finland, FI |
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Abstract: | The aim of this study was to examine the isometric endurance response and the heart rate and blood pressure responses to
isometric exercise in two muscle groups in ten young (age 23–29 years) and seven older (age 54–59 years) physically active
men with similar estimated forearm and thigh muscle masses. Isometric contractions were held until fatigue using the finger
flexor muscles (handgrip) and with the quadriceps muscle (one-legged knee extension) at 20%, 40%, and 60% of the maximal voluntary
contraction (MVC). Heart rate and arterial pressure were related to the the individual's contraction times. The isometric
endurance response was longer with handgrip than with one-legged knee extension, but no significant difference was observed
between the age groups. The isometric endurance response averaged 542 (SEM 57), 153 (SEM 14), and 59 (SEM 5) s for the handgrip,
and 276 (SEM 35), 94 (SEM 10) and 48 (SEM 5) s for the knee extension at the three MVC levels, respectively. Heart rate and
blood pressure became higher during one-legged knee extension than during handgrip, and with increasing level of contraction.
The older subjects had a lower heart rate and a higher blood pressure response than their younger counterparts, and the differences
were more apparent at a higher force level. The results would indicate that increasing age is associated with an altered heart
rate and blood pressure response to isometric exercise although it does not affect isometric endurance.
Accepted: 23 October 1997 |
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Keywords: | Isometric exercise Aging Endurance Cir-culatory responses |
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