title: Understanding Vrikshasana using body mounted sensors: A statistical approach.
abstract: OBJECTIVE
  A scheme for understanding how the human body organizes postural movements while performing Vrikshasana is developed in the format of this paper.
  
  
  METHODS
  The structural characteristics of the body and the geometry of the muscular actions are incorporated into a graphical representation of the human movement mechanics in the frontal plane. A series of neural organizational hypotheses enables us to understand the mechanics behind the hip and ankle strategy: (1) Body sway in the mediolateral direction; and (2) influence of hip and ankle to correct instabilities caused in body while performing Vrikshasana.
  
  
  METHODS
  A methodological study on 10 participants was performed by mounting four inertial measurement units on the surface of the trapezius, thoracolumbar fascia, vastus lateralis, and gastrocnemius muscles. The kinematic accelerations of three mutually exclusive trials were recorded for a period of 30 s.
  
  
  RESULTS
  The results of every trial were processed using two different approaches namely statistical signal processing (variance and cross-correlation). Conclusions obtained from both these studies were in favor of the initial hypothesis.
  
  
  CONCLUSIONS
  This study enabled us to understand the role of hip abductors and adductors, and ankle extensions and flexions in correcting the posture while performing Vrikshasana.
authors: Department of Aerospace Engineering, Indian Institute of Science, Bengaluru, Karnataka, India.
authors: Suhas Niranjan
authors: SN
authors: Yelluru
authors: Department of Aerospace Engineering, Indian Institute of Science, Bengaluru, Karnataka, India.
authors: Ranjith Ravindra
authors: RR
authors: Shanbhag
authors: Department of Aerospace Engineering, Indian Institute of Science, Bengaluru, Karnataka, India.
authors: S N
authors: SN
authors: Omkar
keywords: Abductors and adductors; Vrikshasana; accelerometers; invertor-evertor mechanism; mediolateral