What about the Polar inertial sensor technology that Polar uses?

The cutting edge design and advanced technology has seen the s3 stride sensor™ decrease in size, so much so that it can easily slide into the mid-sole cavity of the adiStar Fusion running shoe. At the same time electrodes have been seamlessly bonded to the adiStar Fusion apparel allowing the Wearlink® module to be easily attached… Real-time running cadence, speed, pace, distance and advanced body feedback made invisible via the world’s first integrated training system*.

How it works

The foundation of the inertial technology is that the foot continually accelerates and decelerates with each stride. With the pod attached to the foot the major phases of gait can be extracted from the sensor signals using advanced DSP (digital signal processing) techniques (as shown in Figure 1). The footpod measures the accelerations throughout each stride, computes foot angles, and then determines the resultant acceleration in the direction of travel. These data can then be integrated for each and every stride to arrive at the information it provides in real time to the user.

What makes inertial technology particularly unique is its user independence, accuracy and ease of use. Right out of the box, the accuracy of the distance computation using the inertial algorithm during running is typically 97%.

As mentioned, one of the inherent advantages of inertial technology is it actually tracks and recreates the motion of the foot through its stride. By recreating each and every stride, it identifies the length of each stride to determine the distance a runner travels in the forward direction.

Inertial technology measures accelerations in the forward and vertical directions. The accuracy increases to 99% with calibration. In relative terms, this accuracy is as good or better than the accuracy provided by GPS.

The following is a diagram developed from the data collected with the inertial technology. It shows the path of the foot measured during a walk, jog, run and sprint. Notice the difference in stride length for the four different types of gait.

Polar s3 Stride Sensor Specifications:

Connectivity:	Polar W.I.N.D. 2.4GHz Wireless
Casing Dimensions:	55 x 39 x 14mm
Casing Materials:	Composite polycarbonate
Weight:	21g
Water Resistance:	To 50M / 5Bar pressure
Battery type:	User changeable, CR2430
Battery life:	Average 50 hours of use
Battery sealing ring:	Silicon O-Ring, 25.0 x 1.2
Operating temperature:	-10°C to +50°C / 14°F to 122°F
Accuracy:	+\- 1 to 3% or better once calibrated

Polar s3 stride sensor W.I.N.D. calibration »

Availability

It features nano technology for highly consistent and accurate speed/pace and distance measurement and cadence data. User replaceable battery, excellent water resistance. Compatible with the Polar RS800sd and Polar RS800. Available separately. Also fully compatible with the adiStar Fusion running shoe.


S3 Stride Sensor RRP  AUD $249.00 incl. GST

Please note:  We are currently out of stock of the S3 Stride Sensor

Spart parts

S3 Stride Sensor clip assembly RRP  AUD $22.00 incl. GST