The Claim

Does training with muscles shortened increase muscle fiber angle?

Source: Differential changes in muscle architecture and neuromuscular fatigability induced by isometric resistance training at short and long muscle-tendon unit lengths.

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
46score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Description
1 study reviewed
In plain English

Doing strength exercises with your muscle bunched up for 8 weeks can make the muscle fibers angle more sharply, which might help them generate more force.

See the scientific wording

Isometric resistance training performed at a short muscle-tendon unit length for 8 weeks, three times per week, is associated with an increase in pennation angle of approximately 6% in the tibialis anterior muscle.

What the research says

1 study

  1. Study: Differential changes in muscle architecture and neuromuscular fatigability induced by isometric resistance training at short and long muscle-tendon unit lengths.

    The study had people do a specific type of leg exercise for 8 weeks, and found that their tibialis anterior muscle got slightly thicker in a way that increased its pennation angle by about 6% — exactly what the claim says.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

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