The Relationship Between Controlling Risk Factors and Cerebral Haemodynamics in Lacunar Stroke

TCD will be used to measure the cerebral blood flow in the middle and posterior cerebral arteries. This will be done at rest and during two sit-stand manoeuvres, whereby the participant will be asked to stand (from a seated position) and stay standing for 1 minute. The participant will then be given time to recover before repeating the manoeuvre. This will occur at the first visit and the follow-up visit 4 weeks after.