Table 1.
Sensitivity and specificity of stroke identification for Finis Swimsense and Garmin Swim.
The actual stroke completed for each lap was compared against the success of the sensors to correctly identify each lap. For both devices, a significant association was found with the actual stroke completed. Sensitivity is a measure of the proportion of positives that are correctly identified, whilst specificity measures the proportion of negatives that are correctly identified. (Fly = Butterfly; Bk = Backstroke; Brs = Breaststroke; Fc = Frontcrawl; Miss = no lap registered).
Table 2.
Comparison of results for lap time and stroke count.
Mean score, standard deviation (SD), standard error of the mean (SE), 95% confidence intervals, interclass correlation coefficient (ICC), limits of agreement (LOA), mean absolute percentage error (MAPE) and the error range are presented for both Finis Swimsense and Garmin Swim monitors and compared with the criterion measures extracted from video footage.
Table 3.
Comparison of results for stroke rate, stroke length and average speed.
Mean score, standard deviation (SD), standard error of the mean (SE), 95% confidence intervals, interclass correlation coefficient (ICC), mean absolute percentage error (MAPE) and the error range are presented for both Finis Swimsense and Garmin Swim monitors, where applicable and compared with the criterion measures extracted from video footage.
Fig 1.
Comparison of overall frequency of error in the measurement of lap times for both Finis Swimsense and Garmin Swim.
Fig 2.
Comparison of overall frequency of error in the measurement of stroke count for both Finis Swimsense and Garmin Swim.
The results indicate a significant overestimation of stroke count for both devices for all strokes except butterfly.
Table 4.
The system requirements of recreational and competitive swimmers will differ and have an impact on the level of accuracy required of the swimming monitors.