Wearable technology is changing the way we train athletes, the military, and first responders. It’s changing the way we test ourselves.

The physiological and biomechanical data that affect performance are no longer hidden. So you no longer have to guess who’s performing at their best and who needs work.

Zephyr™ Performance Systems measure six key inputs that report on more than 20 biometrics. You’ll gain the insights you need to help improve performance wherever your people are tested — in sports, combat, emergency situations and research facilities.

What the BioModule and GPS Units Measure and Provide:

Raw Physiological

Heart Rate

Beats per minute

Breathing Rate

Breaths per minute

Heart Rate Variability

Measure of the variation in the time interval between individual beat detections



Physical positioning of the torso in relation to the X and Y axis


Vector magnitude units in how the various axis points are added (lateral, sagittal and vertical); ~0.2 VMU for walking and ~0.8 for running

Peak Acceleration

Greatest recorded instantaneous movement on an object or body


Three axis calculation of the body's movement


Force exerted upon the body; based on G's


Jump Height & Flight Time

Distance in feet of a jump with the allotted time in the air


The ability to exert strength or force as rapidly as possible in a given action

Peak force

Greatest recorded instantaneous force on an object or body


Heart Rate Confidence

Expressed as a percentage for level of confidence the BioModule is picking up heart rate during activity (dependent upon wear detection and ECG)

Dependent Physiological

Estimated Core Body Temperature

Minute by minute algorithm using heart rate to calculate estimated temperature

Caloric Burn

Heart rate calculation for calories expended

Percent of Heart Rate Max

Percentage of an individual's predetermined maximum heart rate, usually derived from a standardized test such as a fitness test

Percent of Heart Rate at Anaerobic Threshold

Percentage of heart rate at an individual's anaerobic threshold usually derived from a standardized test such as a fitness test

Heart Rate Recovery

Drop in the heart rate following cessation of activity over a 30-second interval (or 60-second, 120-second or 180-second intervals)

Workout Summary

Physiological Load

Cumulative index of effort based on heart rate over a period of time

Physiological Intensity

Instantaneous index of effort based on heart rate at that moment

Mechanical Load

Cumulative index of effort based on acceleration over a period of time

Mechanical Intensity

Instantaneous index of effort based on acceleration at a particular moment

Training Load

Average of the mechanical and physiological load in one number

Training Intensity

Average of the mechanical and physiological intensity in one number

GPS/Accessory Input

GPS Speed

Based in miles per hour

GPS Distance

Based in total miles accumulated

GPS Elevation

Based on total elevation changes in feet above sea level

Blood Pressure

Measured through peripheral sensors running (in Bluetooth mode only)


An estimate of the amount of oxygen in the blood. More specifically, it is the percentage of oxygenated haemoglobin (haemoglobin containing oxygen) compared to the total amount of haemoglobin in the blood (oxygenated and non-oxygenated haemoglobin)

So You Can Judge:

  • Fatigue and recovery time
  • Readiness levels
  • Safety based on body temperature and heart rate
  • Overtraining or undertraining
  • Fitness improvement
  • Calories burned
  • Agility, speed, and distance
  • Intensity and load
  • Stress