Mechanisms of Myofibrillar Hypertrophy vs Sarcoplasmic

[LatinoBulk]

Looking into the latest literature regarding the fluid shift in muscle cells versus actual contractile protein accretion. Thoughts on the 2025 Roberts meta-analysis?

[MedellinMuscle]

The sarcoplasmic expansion theory seems more valid for high-volume trainees. Myofibrillar seems to be the primary driver in lower rep ranges.

[AndeanLifter]

Doesn't the sarcoplasmic increase eventually provide the energetic environment needed for further myofibrillar growth though?

[TropicStrength]

I think we overestimate the distinction in practical training. You rarely get one without a significant amount of the other.

[CaliFlex]

Check out the biopsy studies on elite bodybuilders vs powerlifters. The glycogen storage capacity differences are staggering.

[LatinoBulk]

Exactly, Sydney. The mitochondrial density also seems to shift depending on the specific mechanical tension applied.

[MedellinMuscle]

Wait, are we still citing the Schoenfeld papers for this or has the consensus shifted?

[AndeanLifter]

Consensus is shifting towards a hybrid model. It is not an "either/or" scenario.

[TropicStrength]

Does anyone have the full text for the Haun et al. follow-up?

[CaliFlex]

I will DM it to you. It covers the intracellular space measurements quite well.