Related Experiment Video
Updated: Jan 21, 2026
09:18
Author Spotlight: Assessing the Reliability of Doppler Ultrasound in Measuring Leg Blood Flow
Published on: December 15, 2023
3.5K
Exercise with Blood Flow Restriction to Improve Quadriceps Function Long After ACL Reconstruction
Matthew A Kilgas1,2, Lydia L M Lytle1,3, Scott N Drum2
1Kinesiology and Integrative Physiology, Michigan Technological University, Houghton, United States.
International Journal of Sports Medicine
|July 26, 2019
Summary
Home-based blood flow restriction (BFR) exercise effectively improved quadriceps muscle size and strength years after anterior cruciate ligament reconstruction (ACLR). This safe and feasible program significantly enhanced knee extensor strength symmetry in ACLR patients.
Area of Science:
- Orthopedics
- Sports Medicine
- Rehabilitation Science
Background:
- Quadriceps atrophy and weakness are common long-term issues following anterior cruciate ligament reconstruction (ACLR).
- Persistent deficits in muscle size and strength can hinder functional recovery and increase reinjury risk years after ACLR.
Purpose of the Study:
- To evaluate the effectiveness of a home-based blood flow restriction (BFR) exercise program for improving quadriceps size and strength in individuals several years after ACLR.
- To assess the feasibility and safety of implementing a BFR exercise regimen in a home setting for chronic ACLR recovery.
Main Methods:
- Nine adults with ACLR (5±2 years post-surgery) and nine uninjured controls participated.
- ACLR participants completed a 4-week home-based exercise program involving single-leg knee extensions, half-squats, and walking with blood flow restriction (50% limb occlusion pressure) applied to the involved leg.
- Measurements included rectus femoris and vastus lateralis thickness and knee extensor strength before and after the intervention.
Main Results:
- Significant increases were observed in rectus femoris thickness (11±5%), vastus lateralis thickness (10±6%), and knee extensor strength (20±14%) in the involved leg of ACLR participants (P<0.01).
- Knee extensor strength symmetry improved from 88±4% to 99±5% post-training, comparable to uninjured controls.
- The home-based BFR program was deemed feasible and safe.
Conclusions:
- A home-based blood flow restriction exercise program can effectively enhance quadriceps muscle size and strength long after anterior cruciate ligament reconstruction.
- This intervention offers a viable strategy to address chronic quadriceps deficits and improve functional symmetry in the ACLR population.
- BFR exercise represents a valuable tool for extending rehabilitation benefits beyond the immediate post-operative period for ACLR patients.
More Related Videos
Related Concept Videos
01:29Blood Flow
75.6K
Blood is pumped by the heart into the aorta, the largest artery in the body, and then into increasingly smaller arteries, arterioles, and capillaries. The velocity of blood flow decreases with increased cross-sectional blood vessel area. As blood returns to the heart through venules and veins, its velocity increases. The movement of blood is encouraged by smooth muscle in the vessel walls, the movement of skeletal muscle surrounding the vessels, and one-way valves that prevent backflow.
75.6K
01:17Autoregulation of Blood Flow
7.5K
Autoregulation mechanisms are characterized by their inherent capacity for self-regulation without necessitating specific nervous stimulation or endocrine control. These mechanisms facilitate the adjustment of blood flow and, therefore, perfusion specific to each tissue region. This self-regulation encompasses chemical signals and myogenic controls.
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation....
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation....
7.5K
01:22Cardiopulmonary Resuscitation II: ACLS Airway Management
565
Airway management is a key skill in emergency and critical care settings, as maintaining a clear airway is essential for adequate oxygenation and ventilation.Head Tilt-Chin Lift TechniqueThe head tilt-chin lift maneuver is an essential technique primarily used in patients without suspected cervical spine injuries. To perform this maneuver, one hand is placed on the patient’s forehead, and gentle pressure is applied backward to tilt the head. The fingertips of the other hand are positioned...
565
01:26Characteristics and Functions of Blood
9.4K
Blood is specialized connective tissue comprising about 8% of the body mass. It has a thick, liquid extracellular matrix that contains cells, dissolved proteins, and electrolytes, making it five times more viscous than water. Blood is warm, around 38°C, and has an alkaline pH ranging from 7.35 to 7.45.
The primary function of blood is to transport oxygen and carbon dioxide between tissues and the lungs. Oxygenated blood is bright red, while oxygen-depleted blood is darker. It also carries...
The primary function of blood is to transport oxygen and carbon dioxide between tissues and the lungs. Oxygenated blood is bright red, while oxygen-depleted blood is darker. It also carries...
9.4K
01:11Restriction Enzymes
35.7K
Restriction enzymes are bacterial enzymes used to cut DNA in a sequence-specific manner. To cleave DNA, they bind to specific palindromic sequences called restriction sites. Such palindromic DNA sequences or inverted repeats are commonly found in regions of functional significance, such as the origin of replication, gene operator sites, and regions containing transcription termination signals.
The host bacteria protect their own genomic DNA from these enzymes by methylating these sites. Some...
The host bacteria protect their own genomic DNA from these enzymes by methylating these sites. Some...
35.7K
01:26Exercise Stress Test
1.2K
Introduction
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes
1.2K