Posture muscle relationship with cardiovascular changes under orthostatic challenge.

Lower leg muscles are known to be activated during standing. On the other hand, standing is known to induce orthostatic stress. Our recent work presented that the posture control and cardiovascular systems are related to each other. However, the relationship of the individual muscle activation with blood pressure changes is not fully understood. The present preliminary study conducted experiments to collect data for muscle activation (EMG) and blood pressure (BP) changes during quiet standing. High coherence (>threshold) values observed between the EMG and BP signals suggest a strong relationship between the two. Additionally, the results of the study suggest a compensatory relationship of different lower leg muscles with blood pressure changes during quiet standing.