IMU Airtime Detection in Snowboard Halfpipe: U-Net Deep Learning Approach Outperforms Traditional Threshold Algorithms.

Airtime is crucial for high-rotation tricks in snowboard halfpipe performance, significantly impacting trick difficulty, the primary judging criterion. This study aims to enhance the detection of take-off and landing events using inertial measurement unit (IMU) data in conjunction with machine learning algorithms since manual video-based methods are too time-consuming. Eight elite German National Team snowboarders performed 626 halfpipe tricks, recorded by two IMUs at the lateral lower legs and a video camera.

Is a cork a legal shortcut? - A comparison of the measured and assumed amount of rotation in freestyle tricks.

In snowboard freestyle disciplines, the amount of rotation is commonly determined as the sum of rotations around all board axes and is the most important indicator of the trick difficulty across all snowboard freestyle disciplines. Based on the type of rotation, tricks can be classified as flatspins, corks and flips. It is not yet known whether the type of rotation of a trick can influence the actual amount of rotation.

Determining Physiological and Energetic Demands during High-Level Pommel Horse Routines Using a Modified Method Based on Heart Rate-Oxygen Uptake Functions.

This study aimed (1) to assess the validity of a modified method (M) based on heart rate (HR)-oxygen uptake (VO) regression functions to calculate total energy costs (W) and aerobic (W) and anaerobic alactic energy contribution (W) and (2) to analyse the physiological and energetic demands of high-level pommel horse routines (PH routines). The M was developed because VO measurements are limited during high-level PH routines. Answering Part 1, nine male artistic gymnasts performed a PH routine where energy costs were calculated from VO measurements and then compared with energy costs determined from the HR- VO regressions of M's two additional tests.

Physiological and Energetic Demands During Still-Rings Routines of Elite Artistic Gymnasts.

Purpose: The aim of the study was to analyze physiological and energetic demands of elite gymnasts during still-rings routines (SRRs).

Methods: Eleven male gymnasts (mean [SD] 23.6 [3.