Call centres
Professor Beasley said the problem was most common in the information technology industry and in call-centres.
Professor Cary Cooper, an expert in organisational psychology and health at Lancaster University, said he was not surprised by the findings.
He said people were working longer hours than ever before, and often not taking a proper lunch break, preferring instead to eat a sandwich at their desk while attending to emails.
"People who work in offices are not actually getting up and walking around like they used to," he said.
"New technology has made it easier for them to do this. I think it is causing people physical trouble because they are not taking exercise, but also psychological trouble because they are not interacting with their colleagues, or teambuilding in a face-to-face way."
DVT affects about 100,000 people and kills up to 1,000 people in the UK each year.
A recent study by the Chartered Management Institute and Workplace Health Connect found employers are failing to provide adequate levels of health and well-being support.

It found fewer than one in five organisations conduct workplace health evaluations and fewer than half provide staff with ergonomic advice.