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Effect of body position on the afterload response during sustained exercise
M Sagiv1, A Rotstein, J Watkins
1Life Sciences and Sport Medicine Department, Zinman College, Wingate, Israel.
The Journal of Sports Medicine and Physical Fitness
|June 1, 1992
Summary
Isometric deadlifts significantly increase cardiovascular responses. Upright deadlifts elicit a greater response than supine, suggesting it may be a valuable cardiovascular function indicator.
Area of Science:
- Exercise Physiology
- Cardiovascular Physiology
- Sports Medicine
Background:
- Isometric exercise, including deadlifts, is used to assess strength and physiological responses.
- Understanding the cardiovascular demands of different exercise positions is crucial for training and health assessment.
Purpose of the Study:
- To compare the hemodynamic and cardiovascular responses to upright versus supine isometric deadlift exercise.
- To determine if isometric deadlifts can serve as an indicator of cardiovascular functioning.
Main Methods:
- Eighty males performed 3-minute trials of upright and supine isometric deadlifts at 30% of maximum voluntary contraction (MVC).
- Measurements included heart rate, blood pressure (systolic, diastolic, mean arterial), oxygen uptake, oxygen pulse, and double product at rest and during exercise.
Main Results:
- Both exercise positions significantly increased all measured physiological variables compared to rest (p < 0.05).
- Upright isometric deadlifts resulted in significantly higher values for all physiological variables compared to supine deadlifts (p < 0.05).
- Maximum voluntary contraction (MVC) did not differ significantly between the two positions.
Conclusions:
- The upright isometric deadlift imposes a greater after-load on the cardiovascular system compared to the supine position.
- This exercise may serve as a useful, non-invasive indicator of cardiovascular health and response to exertion.