Knee Position Changes the Seated-versus-Standing Calf Comparison

The main comparison is knee position, not simply the seat

Seated vs standing calf raise is often reduced to one exercise for each calf muscle. The research question is more specific. The gastrocnemius spans the knee and ankle, so changing knee position changes its operating length. The soleus does not span the knee.

In Kinoshita and colleagues’ 2023 original trial, the standing condition used an extended knee and the seated condition used a knee bent to 90 degrees. This is the comparison to retain when reading its result, rather than assuming all exercises bearing those names use identical joint positions.

For a broader map of muscle roles, use an anatomy guide. Here the focus is what the experiment actually measured and how far that finding can be taken.

• Compare muscle roles before interpreting exercise labels

What the twelve-week trial actually did

The study involved fourteen untrained young adults. Each participant trained one leg in the standing condition and the other in the seated condition for twelve weeks, twice weekly. After an initial build-up, training used five sets of ten repetitions at 70% of the condition-specific one-repetition maximum. Muscle volume was assessed with MRI.

These numbers describe the research protocol; they are not a routine recommendation. A within-person design helps compare conditions while leaving questions about other populations, equipment and training designs open.

Read both the larger difference and the similar result

Gastrocnemius growth was greater in the standing condition. Soleus changes were not significantly different between conditions. The soleus finding matters: this experiment does not support turning the seated variation into the uniquely superior soleus-growth exercise.

The percentages are group averages in a small study. They do not predict the change in an individual calf, compare every possible technique, or show that one variation is best for every purpose. The trial also did not establish suitability for someone with pain, a recent operation or limited balance.

• Compare another example of joint position and muscle roles

Acute swelling is a different endpoint

A separate 2023 trial by Kassiano and colleagues studied seventeen young women and measured muscle thickness immediately before and after straight-leg and bent-leg calf-raise sessions. It found different acute swelling responses across the gastrocnemius and soleus.

That immediate response is not the same measurement as muscle-volume change after twelve weeks. It can answer a question about an acute session response without establishing the long-term growth ranking.

This distinction also applies to muscle activation and the sensation of a pump. A measurement taken during or immediately after exercise is not interchangeable with a longitudinal training outcome.

• Keep short-term appearance separate from measured progress

Use the result to interpret claims, not prescribe a routine

When a comparison promises that a variation isolates a muscle, check whether the evidence measured anatomy, electrical activity, immediate swelling or growth after training. Then keep the population, knee position, loading and duration attached to the finding.

The defensible conclusion from the MRI trial is narrow but useful: extended-knee training produced more gastrocnemius growth under that protocol, with similar soleus growth. It does not establish an exercise plan for older adults or replace instruction on equipment, loading and individual constraints.

This article contains no technique sequence or training prescription. A qualified professional can translate evidence into a programme when personal suitability and demonstrations are needed.

• Understand what a strength ratio can and cannot show