The Claim
An 8-week lower-leg resistance training program induces significantly greater standardized hypertrophic growth in the lateral gastrocnemius compared to the soleus and medial gastrocnemius in young, untrained men, indicating that fast-twitch dominant muscles exhibit a higher inherent capacity for size adaptation than slow-twitch dominant muscles during early-stage training.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
After eight weeks of leg workouts, the outer calf muscle grows noticeably bigger than the inner calf muscles in beginners. This suggests that muscles made up of faster-twitch fibers are naturally better at getting bigger when you first start training.
See the scientific wording
During an 8-week resistance training program targeting the lower legs, the lateral gastrocnemius demonstrates significantly greater standardized hypertrophic growth compared to both the soleus and medial gastrocnemius in young, untrained men, suggesting that fast-twitch dominant muscles possess a higher inherent capacity for size adaptation than slow-twitch dominant muscles during early-stage training.
What the research says
1 studyStudy: Loaded inter-set stretch may selectively enhance muscular adaptations of the plantar flexors
The study found that after eight weeks of calf exercises, the outer calf muscle grew more in size relative to its starting point than the inner calf or deep calf muscles, supporting the idea that muscles with more fast-twitch fibers tend to grow bigger faster when you first start training.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.