Key numbers
2-minute
Experimental bout duration
Who was studied and how
The study looked at wall-squat exercise in people with normal blood pressure, recording heart rate and blood pressure during the exercise. Each bout lasted a fixed 2 minutes at a set knee angle. That is different from the Systematic Wall Sit, which times how long you can hold the position.
What they found
Knee angle materially changed the intensity of the exercise and the short-term cardiovascular response. Put simply, a different knee bend changes how hard the hold is and how heart rate and blood pressure respond.
What it means for the Wall Sit, and what it does not
This is why Systematic defines its Wall Sit at a standard 90 degrees rather than treating the wall position as approximate. The study does not give a norm for how long a hold should last, and it does not validate the Systematic test itself.
The evidence
Each cited source is labeled according to how it supports the particular claim on this page. Direct test evidence, underlying-capacity findings and population reference values are distinguished from Systematic-defined protocols and standards. Historical development notes are retained internally rather than presented as public evidence. A study of an underlying capacity is never presented as validation of the Systematic test itself.
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Underlying-capacity evidence
Goldring et al. (2014; published online 2013). The effects of isometric wall squat exercise on heart rate and blood pressure in a normotensive population. Journal of Sports Sciences.
What it found. In fixed 2-minute wall-squat bouts in people with normal blood pressure, knee angle materially changed the effort and the short-term heart rate and blood pressure response.
What it does not show. It was not a hold to failure, gives no time norm and does not validate the Systematic Wall Sit.
The Systematic Healthspan Assessment is a physical baseline. It is not a diagnosis, and it does not estimate a biological age, a disease risk or a lifespan.