Quadriceps Muscle
Quadriceps Muscle - Related Videos
10:12
Isolation of Mitochondria from Minimal Quantities of Mouse Skeletal Muscle for High Throughput Microplate Respiratory Measurements
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Cited by 18 •
2015
Here, we present a modification of a previously reported method that allows for the isolation of high quality and purified mitochondria from smaller quantities of mouse skeletal muscle. This procedure results in highly coupled mitochondria that respire with high function during microplate based respirometirc assays.
09:44
Manual Muscle Testing: A Method of Measuring Extremity Muscle Strength Applied to Critically Ill Patients
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Cited by 135 •
2011
Survivors of acute respiratory distress syndrome (ARDS) and critical illness frequently develop long-lasting muscle weakness. Manual muscle testing (MMT) is a standardized clinical examination commonly used to measure strength of peripheral skeletal muscle groups. This video demonstrates MMT using the 6-point Medical Research Council scale.
08:33
Induction and Assessment of Exertional Skeletal Muscle Damage in Humans
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Cited by 8 •
2016
This article describes a safe and reliable method to induce and quantify exertional skeletal muscle damage in human subjects.
14:02
Ex Vivo Assessment of Contractility, Fatigability and Alternans in Isolated Skeletal Muscles
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Cited by 53 •
2012
We describe a method to directly measure muscle force, muscle power, contractile kinetics and fatigability of isolated skeletal muscles in an in vitro system using field stimulation. Valuable information on Ca2+ handling properties and contractile machinery of the muscle can be obtained using different stimulating protocols.
14:36
Evaluation of Muscle Function of the Extensor Digitorum Longus Muscle Ex vivo and Tibialis Anterior Muscle In situ in Mice
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Cited by 75 •
2013
Changes in limb muscle contractile and passive mechanical properties are important biomarkers for muscle diseases. This manuscript describes physiological assays to measure these properties in the murine extensor digitorum longus and tibialis anterior muscles.
FAQs
Motor-nerve stimulation normally initiates calcium release inside quadriceps muscle fibers, allowing actin and myosin to interact. A neurological disorder can disrupt this signaling pathway and reduce effective force generation, even without a primary muscle strain or tendon injury. Clinically, this mechanism helps explain weakness that interferes with knee extension, posture, gait, or lower-limb mobility.
Most quadriceps-related functional demands concern knee extension, but the rectus femoris also contributes to hip flexion. Consequently, impairment involving this muscle group may influence more than one movement pattern. Recognizing this relationship helps clinicians interpret movement limitations broadly rather than attributing every difficulty to isolated knee weakness.
The clinical meaning of quadriceps dysfunction depends on whether it appears with a muscle strain, tendon injury, arthritis, or neurological disorder. These conditions represent different clinical contexts, so clinicians should not treat every reduction in performance as the same problem. Distinguishing the setting supports more relevant evaluation and rehabilitation planning.
Strength testing provides a functional measure of quadriceps performance and can help evaluate recovery after a problem affecting the muscle group or its control. The findings are relevant to weakness, knee extension, gait, and mobility. Clinicians can interpret this information together with imaging and the patient's broader condition when assessing functional status.
Strength testing evaluates how well the lower limb performs, while imaging contributes to the assessment of quadriceps structure and related injuries. Using both approaches can provide complementary information when clinicians evaluate muscle strains, tendon injuries, arthritis, or recovery. This combination supports a more complete assessment than relying on functional performance or structural evaluation alone.
Rehabilitation exercises are used to support recovery of quadriceps function and help restore gait and lower-limb mobility. They are particularly relevant when weakness follows muscle, tendon, joint, or neurological problems. By addressing impaired function during recovery, rehabilitation can also help reduce the risk of complications associated with persistent weakness.