The purpose of this study was to determine the influence of muscle mass and exercise intensity on blood pressure response to isometric contraction. Twenty male subjects (mean age = 27 yrs) performed one-arm handgrip (HG), one-leg extension (LE) and combined one-arm handgrip plus one-leg extension (COMB) in a random order of exercise for one minute at 30% and 40% of maximal voluntary contraction (MVC). Blood pressure responses were significantly higher (p $$ HG and COMB $>$ LE at both 30% and 40% MVC. However, for each mode of static exercise the hemodynamic responses at 40% MVC were significantly higher than the hemodynamic responses at 30% MVC. There were no significant differences in blood pressure responses between HG and LE within each intensity, except for systolic blood pressure which was significantly greater at 40% MVC than at 30% MVC. Heart rate response increased progressively with increasing size of muscle mass, (COMB $>$ LE $>$ HG) at both intensities. Results indicate that the blood pressure response to static exercise can be attributed in part to the size of the muscle mass being recruited (i.e. COMB) within the same intensity of MVC, and in part to the relative intensity at which the muscle is being contracted. (Abstract shortened by UMI.)
| Identifer | oai:union.ndltd.org:uottawa.ca/oai:ruor.uottawa.ca:10393/7881 |
| Date | January 1991 |
| Creators | Faught, Brent E. |
| Publisher | University of Ottawa (Canada) |
| Source Sets | Université d’Ottawa |
| Detected Language | English |
| Type | Thesis |
| Format | 97 p. |
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