Related Experiment Video
Updated: Aug 12, 2026
06:36
Lower Limb Biomechanical Analysis of Healthy Participants
Published on: April 15, 2020
Lower limb blood flow responses during higher- and lower-load bilateral leg press exercise
Eudoxia Zafiris1, Jeremy N Cohen1, Tania J Pereira1
1Department of Kinesiology and Health Sciences, University of Waterloo, Waterloo, Canada.
Experimental Physiology
|August 11, 2026
Summary
Resistance exercise increases blood flow and shear rates in the superficial femoral artery. These vascular changes occur during exercise and are followed by reactive hyperemia, regardless of exercise intensity.
Area of Science:
- Physiology
- Vascular Biology
- Exercise Science
Background:
- Local blood flow during resistance exercise (RE) is complex due to muscle contractions and pressure changes.
- The shear environment during RE is not well understood and may vary with exercise parameters.
Purpose of the Study:
- To investigate the effects of different resistance exercise intensities on superficial femoral artery (SFA) blood flow and shear rate.
- To characterize the vascular shear environment during large muscle group resistance exercise.
Main Methods:
- Healthy adults performed incline leg press at high-load/low-repetition (75% 1RM) or low-load/high-repetition (35% 1RM) protocols.
- Superficial femoral artery blood velocity and diameter were measured using duplex ultrasound.
- Blood flow and shear rates were estimated during exercise and rest periods.
Main Results:
- Resistance exercise increased mean blood velocity, blood flow, and both anterograde and retrograde shear rates.
- Rest periods between sets exhibited reactive hyperemia with elevated mean shear and abolished retrograde shear.
- Arterial diameter increased significantly during rest periods, correlating with the hyperemic stimulus.
Conclusions:
- Resistance exercise significantly alters SFA blood flow and shear rate dynamics.
- Different loading protocols elicit similar patterns of vascular response during and after exercise.
- This study provides novel insights into the vascular adaptations to resistance exercise across varying intensities.
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