Subjects in this group will undergo sham preconditioning. A blood pressure cuff will be placed around the leg and inflated just lightly to a pressure of 30mmHg, not enough to affect arterial circulation. This will be maintained for 10min followed by 5min of deflation. This will constitute one conditioning cycle. There will be 3 sham conditioning cycles per treatment session.

Study personnel will place a blood pressure cuff around the subject's leg and use it to interrupt the circulation to the leg for 10 minutes followed by release of the blood pressure for 5 minutes. This will be repeated for a total of 3 times every 24 to 48 hours up to 14 days. The cuff will be inflated for 10 minutes and then deflated for 5 minutes. There will be 3 cycles of this. The cuff will be inflated to 200mmHg to induce ischemia, confirmed by palpation of pedal pulses.

application of a blood pressure cuff around a leg and inflating the cuff to 200mmHg to induce limb ischemia for 10min followed by 5min reperfusion. this will be done for 3 cycles every 24-48hours during the first 14 days after subarachnoid hemorrhage

The number of patients who develop deep vein thrombosis and thromboembolism in the treatment and control group.

The number of patients who develop neurovascular injury in the treatment and control group.

The number of patients who cannot tolerate the intervention due to discomfort.

The number of patients with cardiovascular events [defined as hypotension, myocardial ischemia]

The number of patients with a good modified Rankin Scale, defined as less than 2, in the control and intervention group.