A recent small study including just 20 people who were taken through each of the following; a guided meditation, yoga, and allowed to continue working without interruption.
Each intervention lasted 15 minutes and there was a day between each of the interventions. Different stress markers were tested at the baseline, during the 15 minute interventions, and 15 minutes after. Different measures were recorded such as perceived stress, blood pressure, respiration rate, heart rate, and heart rate variability.
Analysis of the data showed both yoga and meditation reduced perceived stress (the mental aspect) plus the effect continued after the post-intervention period. The markers for physical stress tended to return to the baseline levels with the exception of respiratory rates following chair yoga.
While the study was relatively small, its results conclude that there is no harm in implementing a basic 15 minute chair routine at least once a day, especially if you are in a sedentary career. More studies need to be conducted but one can assume the data suggests that the level of productivity, improved employee health, job performance, job satisfaction, and absenteeism could be positively affected by the implementation of workplace yoga and meditaiton.
The following link will provide you with a variety of chair yoga poses you can try.