Abstract
This study aimed to develop an automated method to detect live play periods from accelerometry-derived relative exercise intensity in basketball, and to assess the criterion validity of this method. Relative exercise intensity (% oxygen uptake reserve) was quantified for two men's semi-professional basketball matches. Live play period durations were automatically determined using a moving average sample window and relative exercise intensity threshold, and manually determined using annotation of video footage. The sample window duration and intensity threshold were optimised to determine the input parameters for the automated method that would result in the most similarity to the manual method. These input parameters were used to compare the automated and manual active play period durations in another men's semi-professional match and a women's professional match to assess the criterion validity of the automated method. The optimal input parameters were a 9-s sample window and relative exercise intensity threshold of 31% oxygen uptake reserve. The automated method showed good relative (ρ = 0.95–0.96 and ICC = 0.96–0.98, p < 0.01) and absolute (median bias = 0 s) agreement with the manual method. These findings support the use of an automated method using accelerometry-derived relative exercise intensity and a moving average sample window to detect live play periods in basketball.
Highlights
Basketball is a high-intensity intermittent sport with periods of live play interspersed with frequent stoppages (Stojanovicet al., 2018)
Quantifying overall match demands is useful for training prescription, while quantifying live play demands better describes peak match demands, and enables match demands to be described as a function of playing time
Activity intensity was quantified using accelerometry-derived average net force output (AvFNET) and individual relative exercise intensity was determined as a percentage of relative oxygen uptake (V O2R), as described previously (Staunton et al, 2017, 2018b; Palmer et al, 2021)
Summary
Basketball is a high-intensity intermittent sport with periods of live play interspersed with frequent stoppages (Stojanovicet al., 2018). When quantifying basketball match demands, it is important to consider the overall demands (i.e., including stoppages) and the live play demands (i.e., active on-court periods; Russell et al, 2020). Various methods are used to quantify both overall and live-play match demands in basketball (Stojanovicet al., 2018). Poor validity and reliability can occur with different observers and camera setups (Barris and Button, 2008; Russell et al, 2020), which limits its use for season-long athlete monitoring (Fox et al, 2017)
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