Muscle Length Optimization
Muscle Length Optimization - Related Videos
14:02
Ex Vivo Assessment of Contractility, Fatigability and Alternans in Isolated Skeletal Muscles
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Cited by 54 •
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 73 •
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.
03:37
Optimal Foraging - Concepts
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2019
Optimal Foraging Organisms must acquire and use resources in their environment to survive. While food is one of the primary resources organisms must search for, individuals also need to seek habitats, shelter, and mates. This process of searching for resources is known as foraging, which involves a series of costs and benefits. More specifically, acquiring a resource provides the organism with a benefit, however, searching and capturing the resource requires expenditure of time and energy.
05:32
Optimal Foraging - Student Protocol
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2019
Simulating Foraging with Artificial Habitats and Prey ExpandNOTE: The foragers will hunt for prey represented by pinto beans in four buckets of rice with varying prey densities. Without knowing what these densities are, foragers must obtain as many prey items as possible in as little time as possible. HYPOTHESES: In this experiment, the experimental hypothesis could be that foragers will catch the most prey in the higher prey density bucket and also spend the most time foraging there. The...
06:43
Optical Cross-Sectional Muscle Area Determination of Drosophila Melanogaster Adult Indirect Flight Muscles
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Cited by 6 •
2018
We report a method to quantify muscle area, which is an indirect method to determine muscle mass in Drosophila adults. We demonstrate the application of our methodology by analyzing the indirect flight muscles in a Drosophila model of Myotonic Dystrophy disease.
FAQs
Sarcomere geometry determines the degree of overlap between actin and myosin, the protein filaments that form force-producing cross-bridges. Changes in muscle length alter this overlap, which affects how many cross-bridges can form and therefore how effectively the muscle produces force. This relationship explains why force capacity varies as joints move through different positions.
A muscle’s mechanical effectiveness changes as joint position alters its length. At some lengths, sarcomere overlap supports stronger force production, while other lengths may be less favorable. The nervous system must therefore coordinate muscle activity with changing geometry to maintain posture, generate movement, and support skilled actions rather than relying on a single fixed muscle length.
Muscle spindles provide sensory feedback about muscle length and changes in length to the nervous system. This information gives the brain and spinal cord a basis for monitoring the mechanical state of muscles during movement. Such feedback contributes to control of posture, reflexes, and coordinated actions as muscle lengths change.
Mechanical effects arise from sarcomere geometry and actin-myosin overlap, which influence the muscle’s capacity to form force-producing cross-bridges. Neural control adds sensory information from muscle spindles and coordination by the brain and spinal cord. Studying both factors helps distinguish changes caused by muscle structure from adjustments involved in posture, reflexes, and skilled movement.
Researchers can examine how changes in muscle length relate to force production, movement, and control at different joint positions. They can also consider muscle spindle feedback about length and length changes when interpreting nervous-system coordination. This combined perspective links sarcomere-level mechanics with posture, reflexes, and skilled movement rather than evaluating force in isolation.
In neuroscience, the concept helps explain how the brain and spinal cord coordinate posture, reflexes, and skilled movement across changing joint positions. Its practical relevance extends to rehabilitation and athletic performance, where effective force and control matter, as well as to assistive and neuroprosthetic technologies designed around the interaction between muscle mechanics and neural control.