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Post-exercise hyperemia after ischemic and non-ischemic isometric handgrip exercise.
Takuya Osada1, Toshihito Katsumura, Norio Murase
1Department of Preventive Medicine and Public Health, Tokyo Medical University, Japan. DENTACMAC@aol.com
Journal of Physiological Anthropology and Applied Human Science
|December 4, 2003
Summary
Post-exercise forearm blood flow (FBF) recovery, assessed by peak FBF, excess FBF, and FBF time constant (FBF(Tc)), is influenced by exercise intensity and duration. Ischemic exercise shows a greater hyperemic response, suggesting potential for peripheral vascular disease assessment.
Area of Science:
- Physiology
- Cardiovascular Research
- Exercise Science
Background:
- Post-exercise muscle oxygenation recovery kinetics offer insights into peripheral vascular disease (PVD).
- Assessing forearm blood flow (FBF) during recovery is crucial for understanding vascular function.
Purpose of the Study:
- To investigate the post-exercise hyperemia response (peak FBF, excess FBF, FBF time constant [FBF(Tc)]) following isometric handgrip exercise (IHE).
- To examine these responses under both ischemic and non-ischemic conditions, varying exercise intensity and duration.
Main Methods:
- Study I: Ten subjects performed 2-min IHE at 10% and 30% maximum voluntary contraction (MVC) with or without arterial occlusion (AO).
- Study II: Six subjects performed 30% MVC IHE with AO for varying durations relative to time to exhaustion.
- Forearm blood flow (FBF) was measured using Doppler ultrasound.
Main Results:
- Ischemic IHE resulted in significantly higher peak FBF and excess FBF compared to non-ischemic conditions.
- Higher exercise intensity (30% vs. 10% MVC) led to significantly increased peak FBF, excess FBF, and FBF(Tc).
- In ischemic conditions, peak FBF and excess FBF increased linearly with exercise duration, while FBF(Tc) increased exponentially.
Conclusions:
- Post-exercise hyperemia parameters (peak FBF, excess FBF, FBF(Tc)) correlate with exercise intensity and duration in both ischemic and non-ischemic states.
- Ischemic exercise elicits a more pronounced hyperemic response.
- These FBF parameters, particularly with ischemic exercise, show promise as indicators for assessing peripheral vascular disease.