In advanced climbers, two types of strength training—low-load training with restricted blood flow and high-load training—did not lead to better finger endurance after five weeks of training, when...
Mechanism
Synthesis from 1 study
Squeezing your fingers hard or squeezing them lightly while your arm is tight both make your fingers stronger, but neither helps them last longer when you're doing repeated squeezes. That’s because the muscles grow bigger and can push harder, but they still get tired just as fast when you keep...
Most probable mechanism
When you train your fingers with heavy weights or light weights with your arm squeezed tight, your finger muscles get bigger and stronger, but they don't get better at handling repeated squeezing without getting tired. This is because the training makes the muscles stronger by adding more muscle fibers, but it doesn't improve how well the muscles use oxygen or clear out waste products during long, repeated efforts.
High mechanical tension or metabolic stress from resistance training activates signaling pathways that increase muscle protein synthesis and satellite cell activity, leading to an increase in muscle fiber size.
Increased muscle cross-sectional area enhances maximal force production, resulting in higher maximal voluntary contraction strength.
Despite increased strength and size, the muscle's capacity to sustain repeated contractions at submaximal intensities is unchanged because there is no significant adaptation in mitochondrial density, capillary supply, or metabolic enzyme activity to improve fatigue resistance.
The inability to improve endurance under intermittent isometric contractions at 57% MVC reflects a mismatch between enhanced force capacity and unchanged metabolic efficiency during prolonged activity.
Evidence from Studies
Supporting (1)
Community contributions welcome
Comparison of low load blood flow restriction and high load resistance training of the finger flexors in advanced level climbers: a pilot study
Contradicting (0)
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