Vertical breast displacement (VBD; cm) relative to the torso was measured using an Optotrak Certus® motion capture system (200 Hz, Northern Digital, Ontario, Canada) during dynamic treadmill running to determine whether breast motion was consistent among the different strap conditions. Two infrared-emitting diodes (2 mm diameter) were placed on each nipple using double-sided toupee tape (Creative Hair Products, Melbourne, Victoria, Australia), which was placed over micropore surgical tape (3M™ Australia, NSW). A third diode was placed on the sternal notch as a reference point to characterise trunk motion in the vertical plane. Three-dimensional motion of the three markers was recorded during each running trial for six 10-s periods using First Principles software (Version 1.2.2, Northern Digital Inc., Ontario, Canada). The average VBD (minimum from maximum during dynamic treadmill running) relative to the trunk was calculated from a representative 8-s epoch (equivalent to 15 to 20 consecutive breast cycles) for each of the six 10-s data recordings per condition.
First principles software
Manufactured by Northern Digital
Sourced in Canada
First Principles software is a data analysis tool designed for scientific research and laboratory applications. It provides a platform for processing and visualizing experimental data. The software's core function is to enable users to organize, analyze, and interpret their research data through a streamlined and user-friendly interface.
Automatically generated - may contain errors
2 protocols using first principles software
1
Breast Motion Analysis during Treadmill Running
2
Evaluation of Guide-Pin Insertion Accuracy
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To analyze the deviation of the executed guide-pin entry point and trajectory from the planned control, the guide pin trajectory was digitized. Each specimen was rigidly fixed to an optical tracker and digitization points were collected and recorded using a tracker mounted stylus (Optotrak Certus Position Sensor Full, Northern Digital Inc.) in combination with North Digital Inc. First Principles software (Northern Digital Inc., ver. 1.2.4). Digitization of the inserted guide-pin was achieved by probing the start point, the opposite end of the guide-pin, the mounting points, and taking a trace of the guide-pin.
Analysis of the orientation and insertion of the guide-pin was achieved by importing the 3D models into SolidWorks 2020 software (Dassault Systèmes SolidWorks Corp., ver. 28.3.0.0086). Measurements were taken to determine the location of landmarks to establish a glenoid coordinate system which was partially based on previous protocols [13 (link)].
Data from both the control and the digitization of the guide-pin insertions were imported to MATLAB software (The MathWorks Inc., ver. 9.7.0.1190202) for comparison. Analyses were conducted to compare the orientation of the guide-pin with respect to the glenoid coordinate system (X=anterior/posterior, Y=inferior/superior, Z=medial/lateral) as well as determining the entry point of the pin.
Analysis of the orientation and insertion of the guide-pin was achieved by importing the 3D models into SolidWorks 2020 software (Dassault Systèmes SolidWorks Corp., ver. 28.3.0.0086). Measurements were taken to determine the location of landmarks to establish a glenoid coordinate system which was partially based on previous protocols [13 (link)].
Data from both the control and the digitization of the guide-pin insertions were imported to MATLAB software (The MathWorks Inc., ver. 9.7.0.1190202) for comparison. Analyses were conducted to compare the orientation of the guide-pin with respect to the glenoid coordinate system (X=anterior/posterior, Y=inferior/superior, Z=medial/lateral) as well as determining the entry point of the pin.
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