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Original articles  CARDIOVASCULAR SYSTEM


The Journal of Sports Medicine and Physical Fitness 2002 Dicembre;42(3):451-7

lingua: Inglese

Influence of weight training status on hemodynamic adjustments to isometric actions

Patrick B. T., Caterisano A.

Depart­ment of ­Health and Exer­cise Sci­ence Furman Uni­ver­sity, Green­ville, ­South Car­o­lina, USA


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Back­ground. The pur­pose of ­this ­study was to inves­ti­gate the hemo­dy­namic adjust­ments to ­fatiguing iso­metric hand­grip (IHG) per­formed at 20 and 60% of max­imal vol­un­tary con­trac­tion (MVC) in 10 ­weight-­trained (WT, 4.8±1.6 yrs) and 8 ­untrained (UT) men.
­Methods. Hemo­dy­namic meas­ures ­were ­recorded at ­rest, ­during sus­tained IHG to ­fatigue, and ­during ­recovery. ­Blood pres­sures and ­heart ­rates (HR) ­were meas­ured by aus­cul­ta­tion and elec­tro­car­di­og­raphy, respec­tively. ­Stroke ­volume (SV) was ­assessed by impe­dance car­di­og­raphy. ­Mean arte­rial pres­sure (MAP), car­diac ­output (CO) and ­total periph­eral resis­tance (TPR) ­were cal­cu­lated.
­Results. ­Between ­group com­par­i­sons in ­peak hemo­dy­namic adjust­ments (­fatigue ­value-­resting ­value) to IHG ­were ana­lyzed ­across inten­sities by ­MANOVA and ­follow-up uni­var­iate ­tests. The ­peak adjust­ments in MAP, HR, and SV ­during IHG at 20 and 60% MVC ­were depen­dent on inten­sity (60%>20% MVC) but ­were not sig­nif­i­cantly dif­ferent (p>0.05) ­between ­groups. How­ever, the inten­sity-depen­dent, ­peak adjust­ments in CO (WT=1.17±1.2 L·min-1 vs UT= -0.40±1.7 L·min-1, p=0.005) and TPR (WT=4.4±6.1 PRU vs UT=10.2±8.3 PRU, p=0.02) ­were sig­nif­i­cantly dif­ferent ­between ­groups ­across inten­sities of IHG.
Con­clu­sions. The ­results sug­gest ­that ­weight ­training ­does not sig­nif­i­cantly influ­ence the ­pressor ­response but may sig­nif­i­cantly ­modify the adjust­ments in ­total-­body cir­cu­la­tion and vas­cular resis­tance ­during ­fatiguing IHG per­formed at 20 and 60% MVC.

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