What we've found so far suggests that doing extra partial reps after failure during Smith machine calf raises may help untrained men grow their calf muscles a bit more over time. Our analysis of the available research shows this effect is based on one assertion that supports the idea, with no studies refuting it [1].
We looked at 60.0 supporting data points and found they all point to the same conclusion: when untrained individuals continue with smaller, partial-range calf lifts right after they can’t complete full reps on the Smith machine, it could lead to slightly greater muscle growth over a 10-week period [1]. These partial reps may add extra tension and work to the calf muscles, which our analysis suggests might support additional growth. However, we only have one assertion backing this, even though it draws from a large number of supporting observations.
We don’t yet have any studies that challenge this idea, nor do we have direct comparisons or long-term results beyond 10 weeks. Because of this, we can’t say how strong or lasting the effect might be, or whether it applies to all untrained men. Our current analysis is limited to what’s been reported, and there may be factors we haven’t accounted for, like differences in training habits or calf muscle responsiveness.
The evidence we've reviewed leans toward a possible benefit from adding partial reps after failure in this specific exercise and group. But we also recognize that this is a narrow view based on limited assertions. More data would help us better understand how consistent or meaningful this effect really is.
Practical takeaway: If you're new to training and hit failure on Smith machine calf raises, doing a few extra short lifts might help you gain a bit more muscle over time — but don’t expect dramatic changes, and keep an eye out for new evidence as it becomes available.
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