Adaptive smartphone-based sensor fusion for estimating competitive rowing kinematic metrics
Fig 4
DGPS computed boat speed as a function of percent stroke for two trials (elite and club-level 24SE).
Each stroke is plotted as an orange line and the mean of all strokes as a dark line. Because the DGPS data is sampled at only 5 Hz and the relative precision is lower than the accelerometer, the measured speed profile is less smooth and repeatable than the acceleration profiles in Fig 3.