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Body Dimensions

Below the detailed explanation of the body dimensions that can be filled in in the configuration window in MVN software are described. We only recommend to fill in all body dimensions if:

  • the experiment requires very accurate data
  • or the results are participant depended

Otherwise, fill in only body height and shoe length, and all the other body dimensions will be automatically scaled according to these two dimensions. 

You can also find a tutorial video about how to measure each body dimension: https://tutorial.xsens.com/video/body-measurements

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NOTE: by hoovering with the mouse over any of the Body Dimensions Values, a reminder of the Body Dimensions measurement will appear. 

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1. Body Dimensions Measurements

Body Measure

Description

Further description

Measure the following dimensions in N-pose. Subject with the feet below the hip, arms straight down close to the upper legs. 

Body Height

Distance from the floor to the top of the head.

If the recording will be performed with shoes, please keep the shoes on to measure all body dimensions. Contrarily, please remove the shoes to measure all the body dimensions.

Foot or Shoe Length

Full length of the shoe or the foot. 

Measure from the back of the heel to the front of the toe. Or if wearing shoes, measure full length of the shoe.

Shoulder Height

Shoulder Height is the distance between the floor and the left or right acromion process of the scapula. 

The subject should have the shoulders relaxed. Find the clavicle and continue palpating the clavicle laterally (distally) until you reach the acromion. 

Shoulder Width

The shoulder width is the distance between the left and the right acromion process of the scapula. 

The subject should have the shoulders relaxed. Find the clavicle and continue palpating the clavicle laterally (distally) until you reach the acromion. 

Measure the following dimensions in T-pose. Subject with the feet below the hip, arms straight and pointing horizontally. The arms should be in a 90 degrees with the trunk. The arms should be 180 degrees apart. To ensure a good position the participant can be placed against with the back, arms and feet touching the wall. 

Elbow Span

The elbow span should be measured from the right to the left olecranon in T-pose.

The olecranon is easily found by bending the elbow and finding the most distal bone process.

Wrist Span

The wrist span should be measured from the right to the left ulnar styloid in T-pose.

With the palm of the hand facing downwards, from the middle upside of the wrist move distally from the thumb. Then, the ulnar styloid is the prominence at the extremity of the wrist. 

Arm Span

The arm span is measured from fingertip to fingertip, in T-pose.

Guarantee that the arms are placed in 90 degrees with the trunk. 

Hip Height

Hip height is measured from the floor to the greater trochanter.  

To easily find the center of rotation of your leg you can swing your leg forwards and back and sideways.

Hip Width

The hip width is measured from the left to the right anterior superior iliac spines.

To easily find these notch, palpate the highest point of your pelvis and bring your thumbs forwards and downwards until you find the two notch. These points most of the times coincide with the center of the legs.

Knee Height

Knee height is measured from the floor to the lateral epicondyle.

This point can be found by locating the line between the upper and lower leg and moving slightly upwards. To easily locate this point you can bend the leg 90 degrees.

Ankle Height

Ankle height is measured from the floor to the center of the ankle.

The center of the ankle is located in the lateral malleolus. This is the most lateral prominence in the ankle.

Extra Shoe Sole Thickness

Height of the shoe sole only.

Only measure foot sole height if the subject is wearing ‘very thick soled shoes’ or stilts. 

 

 

2. Offline Body Dimensions

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3. Changing Body Dimensions of a Recorded File

If a recording contains wrong dimensions this can affect the quality of the data. There is an easy way to solve this.

In the below example, the Hip Width and Hip Height Body Dimensions were not measured correctly and where to large. 

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1. To change the Body Dimensions of this file, first, go to the Hardware setup on the left side, and open the Body Dimensions Tab.

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2. Change the wrong Body Dimensions manually or load a previous save Body Dimensions file. 

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NOTE: After changing Body Dimensions the avatar will show the new measurement directly. However, the Motion Capture data first has to be processed to make use of these new Body Dimensions. 

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3. Open the Reprocess menu by clicking the gears icon mceclip11.png
4. Select the applicable reprocess settings and pres Start and Close. More info on reprocessing: Reprocess (HD)

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After reprocessing is done, the Avatar will be scaled to the new Body Dimensions and the Motion Capture data will be adjusted accordingly. 

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