The purpose of this study was to analyze kinematic changes occurring after the application of technical tethered swimming in athletes.
For each athlete, individual characteristics of the kinematics of the movement of the hip rim during the averaged cycle for the first and second laps were calculated. A special inertial device with a built-in triaxial gyroscope and triaxial accelerometer (REJ62g, JD Jaroslaw Dolinski, Poland) was used to measure and record changes in speed and acceleration. The device (65x50x30 mm, 95 g) was placed in the foam in such a way as to minimize hydrodynamic drag while ensuring stable immobilization on the dorsal part of the swimmer's hip rim.
Samples:
Nineteen girls (age 13.18 ± 0.66 years; body height 163.6 ± 5.2 cm; body weight 50.8 ± 4.42 kg; body fat 20.5% ± 2.0%) and 20 boys (age 13.33 ± 0.6 years; body height 167.8 ± 8.76 cm; body weight 52.46 ± 8.8 kg; body fat 14.1% ± 2.3%) participated in the study. All subjects were athletes of a local sports club.
Procedures
Measurements were conducted in a 25-meter pool while swimming at maximum speed. The athletes did not jump off the starting blocks, but started by pushing off the wall, swimming two laps, between which they performed a crawl-typical turn.
The participants were divided into two groups: control and experimental. The experimental group incorporated technical tethered swimming into their training program. Athletes in this group performed 45-minute tethered technical swimming sessions once per week over an eight-week period. During the same timeframe, the control group engaged in technical training under free-swimming conditions.
During training, the test subjects were monitored using Polar Verity sense sensors, which allow real-time measurement of heart rate using Polar Team software. After a task, each athlete was asked to rate the task using the Children's OMNI Scale of Perceived Exertion (OMNI)
Test subjects performing tethered technical swimming were subjected to pulling force measurements during technical work to determine the maximum force with which they performed the technical task. A tether with a force meter (ZPS5-BTU1kN, Staniak, Poland) recorded the pulling force at 100 Hz and sent the data to a computer program for further analysis (MAX6v0M software, Poland).
The dataset contains columns:
A - I - the anonymized data of the subjects studied.
J - Result of Maximal Propulsive Force (N)
K - P - results of a 10-second measurement of thrust strength.
N - FC - processed test data obtained with a three-axis accelerometer.
Legend:
L – motion during active left upper limb,
R – motion during active right upper limb,
I25 – the first part (25 m) of the analyzed effort,
II25 – the second part (25 m) of the analyzed effort,
Ax [m/s2] – acceleration along the vertical axis in traversing movements.
Ab [m/s2] - acceleration along the sagittal axis in traversing movements.
Ab [m/s2] - acceleration along the transverse axis.
Gs_MAX [deg/s] – angular velocity around the sagittal axis of the athletes in yaw movements (yaw rotation),
Czas do MAX [s] – time needed to achieve.
Gv [deg/s] – angle around the long axis in rotation movements,
KGodn [deg] – maximum angle around the long axis in rotation movements
(2024)
