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Updated: Jan 13, 2026

Author Spotlight: Assessing the Reliability of Doppler Ultrasound in Measuring Leg Blood Flow

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Local and Systemic Responses to Low-Intensity Cycling With Blood Flow Restriction Compared to High-Intensity Cycling:

Sanghyeon Ji^1,2, Michael Boschmann³, Michael Behringer⁴

¹Section Exercise Physiology, German Sport University Cologne, Cologne, Germany.

Scandinavian Journal of Medicine & Science in Sports

|October 28, 2025

Summary

This summary is machine-generated.

Blood flow restriction (BFR) during low-intensity cycling increases physiological stress, comparable to high-intensity cycling. While BFR may enhance training adaptations, high-intensity exercise induces greater local muscle stress for adaptation.

Keywords:

aerobic exercise blood‐flow‐restricted exercise hyperkalemia interstitial fluid mechanical stress metabolic stress

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Area of Science:

Exercise Physiology
Sports Science
Muscle Physiology

Background:

Blood flow restriction (BFR) is increasingly used to enhance training adaptations.
However, its acute effects on physiological stress during exercise are not fully understood.
This study investigates the metabolic and perceptual responses to BFR during low-intensity cycling.

Purpose of the Study:

To compare the metabolic and perceptual responses of low-intensity cycling with BFR (LI+BFR) to low-intensity (LI) and high-intensity (HI) cycling without BFR.
To assess local and systemic physiological stress induced by these protocols.
To evaluate markers of muscle damage and perceptual exertion.

Main Methods:

Ten males completed three randomized cycling protocols: LI, LI+BFR, and HI, matched for time and external work.
Muscle interstitial metabolites (lactate, pyruvate) were measured via microdialysis.
Systemic responses (blood gas analysis, cardiorespiratory measures), muscle damage markers (CK, LDH), and perceptual responses were assessed.

Main Results:

Muscle interstitial lactate and pyruvate were highest in HI, followed by LI+BFR, and lowest in LI.
Systemic and cardiorespiratory responses were higher in LI+BFR and HI compared to LI.
Perceived exertion and pain were greatest during LI+BFR.

Conclusions:

BFR intensifies local and systemic physiological stress during low-intensity exercise, potentially enhancing muscle adaptation.
High-intensity exercise, when matched for work and time, induces greater local muscle stress, which may be crucial for adaptation.
BFR can be a potent strategy to augment training stimuli, but high mechanical loading remains superior for inducing maximal local stress.