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So either sitting kills by itself and standing up is enough to avoid it, or sitting kills by taking time from being physically active and it's not enough to stand up (which also takes time from being physically active).

Here's some brand-new research based on 1000 people wearing accelerometers 24/7: http://epublications.uef.fi/pub/urn_isbn_978-952-61-2928-0/i...

Sedentary behaviour, physical activity, and risk of coronary artery disease and diabetes mellitus

"From the accelerometer-derived parameters of SB [sedentary behaviour], a higher number of daily SB bouts lasting over 10 minutes was the strongest predictor of a high CVD [cardiovascular disease] risk."

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