*4.4. Hardware*

Table 4 presents the properties of the inertial sensors used in the 36 reviewed papers. Fourteen of the 36 records (15/36—41.7%) used more than one sensor to make measurements. Seventeen of the 36 records (17/36—47.2%) used an inertial sensor with a built-in accelerometer and gyroscope or magnetometer. Of these seventeen, four (4/17—23.5%) only used an accelerometer and gyroscope and the remaining 13 (13/17—76.5%) also incorporated a magnetometer. The highest reported accelerometer range was ±16 g and the lowest was ±2 g. Compared to our laboratories, previous systematic literature review on the use of inertial sensors in combat sport [3], which reported a maximum and minimum operating range of ±750 g and ±8 g, respectively, these ranges are low. Nonetheless, rowing is a sport that does not typically consist of high impact situations and thus ±16 g and even ±2 g should have a minute risk of sensor saturation.

The measurement devices' sampling frequencies ranged from 25 Hz to 250 Hz, again, compared to combat sport these are low; however, the movement in rowing is far slower compared to strikes in combat sport. Typically, stroke rates in rowing range from 20 strokes per minute (SPM) to 40 SPM (2/3 strokes per second) and thus even a sensor only recording 25 samples per second is going to record the motion with ease. The only concern is that a low sampling rate might only register one sample peaks and troughs, which can lead to underestimates of the true magnitude.
