Effects of Exercise Intensity and Body Position on CV Function During Resistance Exercise
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JEPonline Journal of Exercise Physiologyonline
Official Journal of The American
Society of Exercise Physiologists (ASEP)
ISSN 1097-9751
An International Electronic Journal
Volume 7 Number 4 August 2004
Fitness and Training THE EFFECTS OF EXERCISE INTENSITY AND BODY POSITION ON CARDIOVASCULAR VARIABLES DURING RESISTANCE EXERCISE
COLIN WILBORN, MIKE GREENWOOD, FRANK WYATT, RODNEY BOWDEN, AND DARREN GROSE Center for Exercise Nutrition and Preventive Health, Dept. of Health, Human Performance, and Recreation, Baylor University, Waco, Texas 76798 ABSTRACT THE EFFECTS OF EXERCISE INTENSITY AND BODY POSITION ON CARDIOVASCULAR VARIABLES DURING RESISTANCE EXERCISE. Colin Wilborn, Mike Greenwood, Frank Wyatt, Rodney Bowden, Darren Grose. JEPonline 2004;7(4):29-36. The role of exercise intensity and body position on cardiovascular alterations during resistance exercise needs further investigation. Consequently, the purpose of this study was to evaluate differences in cardiovascular variables and body position at: a) onerepetition max (1 RM); b) 65 % of 1 RM; c) 85 % of 1 RM for both leg press and hack squat. Sixteen male subjects completed tests on an inverted leg press (ILP) and upright hack squat (HS) allowing calculations of 1 RM, and 65% and 85% of 1 RM. Participants completed a maximum number of repetitions to volitional failure at each intensity, followed by five minutes of recovery between sets. Participants then rested for 10 min and completed the same series of tests on the alternative machine. Manual sphygmomanometry was used to measure blood pressure (BP) before and immediately after completion of each set. A heart rate (HR) monitor using electronic telemetry was used to track changes in HR. There were no significant (p > 0. 05) differences in systolic blood pressure (SBP) or HR between body position or apparatus. A significantly higher HR and BP were found in the following conditions for HS: 65% > 1 RM, 85% > 1 RM, 65% > 85%. Also, during the LP condition, BP and HR were greater at 65% than during 1 RM. These findings suggest cardiovascular measures are influenced by intensity, rather than apparatus or body position, during resistance exercise. Key Words: Blood pressure, Heart rate, Strength training INTRODUCTION Resistance training is a highly recommended form of exercise for athletes, the general population, and for individuals with or at risk for cardiovascular disease. There are many physical and physiological adaptations that occur as a result of consistent resistance training. Those changes include increased muscle strength, power, endurance and size, increased bone density and strength, reduced body fat, increased muscle -to-fat ratio, and

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