When trained individuals perform cable lateral raises and dumbbell lateral raises with the same number of sets, reps, weight, and effort to muscle failure, both exercises result in the same amount of...
Mechanism
Synthesis from 1 study
The side shoulder muscle grows the same whether you use a dumbbell or a cable, as long as you stretch it fully and push it until it can't move anymore. The stretch under load activates internal sensors that tell the muscle to build more protein, making it thicker.
Most probable mechanism
When the side shoulder muscle is stretched while under load, the internal spring-like protein titin senses the stretch and triggers signals that tell the muscle to build more protein, leading to growth. This happens whether the weight is a dumbbell or a cable, as long as the muscle is stretched fully and pushed to failure.
The lateral deltoid muscle is taken through a full range of motion to a lengthened position where the humerus is parallel to the torso, placing the muscle on the descending limb of the length-tension relationship.
Mechanical tension applied at this lengthened position activates titin-based mechanosensors within the muscle fibers, initiating intracellular signaling cascades involving mTOR and MAPK pathways.
These signaling pathways increase the rate of muscle protein synthesis and suppress protein breakdown, resulting in net accretion of myofibrillar proteins.
The accumulation of myofibrillar proteins increases the cross-sectional area of muscle fibers, leading to measurable thickening of the lateral deltoid.
Evidence from Studies
Supporting (1)
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Dumbbell versus cable lateral raises for lateral deltoid hypertrophy: an experimental study
Contradicting (0)
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Gold Standard Evidence Needed
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