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GAIT AND FOUL RISK DIFFERENCES BETWEEN TREADMILL AND OVERGROUND RACEWALKING
Get PDFThis study compared treadmill and overground racewalking kinematics among 22 elite athletes at their personal best (PB) and 85% PB speeds, revealing significant differences. Ankle dorsiflexion angle decreased at heel strike, while hip flexion angle increased, alongside greater hip angle at toe-off. Comparing PB to 85% PB, contact time and hip flexion angle at heel strike decreased, along with decreased ankle plantarflexion at toe-off, but flight time and step length at heel strike increased. This suggests treadmill racewalking, particularly at PB speeds, exhibits unique gait features, yet without significant differences in flight time and knee angle between conditions, implying no increased disqualification risk
THE COORDINATION OF UPPER AND LOWER LIMB MOVEMENTS IN SHOOTING BASKETBALL FROM VARIOUS DISTANCE: A PILOT STUDY
Get PDFUsing continuous relative phase (CRP) to quantify upper-lower limb coordination in shooting basketball. Six male participants performed free-throws and 3-point shots in a random order to yield 10 swish shots and 10 missed shots at each distance for analysis. The SPM analysis on CRPs revealed that a similar strategy was used to coordinate upper and lower limbs for shooting (p\u3e0.05), with no distinguished coordination pattern for swish shots (p\u3e0.05). The analysis on between-trial variability of coordination revealed that swish shots required more adjustment of proximal coordination, and 3-point shots entailed more adjustment of distal coordination. These findings shed light on a better understanding of limb coordination required before ball release in shooting basketball
INTRA- AND INTER-SUBJECT VARIABILITY IN A REALISTIC, NON-STANDARDIZED EXERGAMING SCENARIO
Get PDFThe purpose of this study was to assess the variability of lower extremity mechanics related to biomechanical risk factors for anterior cruciate ligament injury. Lower body kinematics were measured in healthy subjects in a realistic, non-standardized exergaming scenario. Variability in a jump exercise were described with the coefficient of variation and leg symmetry was assessed using Welch’s t-test. Inter-subject variability was moderate-high and intra-subject variability was low-moderate in all variables, while leg symmetry differed significantly for knee internal rotation and hip extension (p \u3c .001), but not in the knee valgus. Athletes showing high risk knee biomechanics and high movement variability need clear instructions to prevent more extreme angles. Athletes showing low movement variability need proper recovery periods to avoid ACL fatigue failure
THE IMPACT OF CLASSICAL CHINESE DANCE ON THE GAIT OF THE ELDERLY – CROSS SECTIONAL STUDY
Get PDFThis study was to explore the difference of gait between normal healthy elders and elders who experienced in classical Chinese dance. Subjects divided into 2 groups (7 subjects in classical Chinese dance group, 7 subjects in control group),data was collected at a single point in time from groups and used the APDM Movement Monitoring system to analysis gait patterns. The experiment group showed improved gait metrics: smaller left circumduction (4.3±2.2 vs. 7.2±1.3, p=0.01), larger right foot strike angle (17.58±2.53 vs. 11.04±5.46, p=0.014), reduced trunk coronal motion (3.47±1.04 vs. 6.90±2.36, p=0.004), and decreased trunk transverse motion (5.78±.79 vs. 7.06±1.22, p=0.038). These results suggest classical Chinese dance maintaining elderly gait and stability, warranting further exploration as a geriatric therapeutic comparison
THE EFFECT OF THE DIFFERENCE IN RESISTANCE TRAINING VELOCITY LOSS ON MUSCULAR STRENGTH AND EXPLOSIVE PERFORMANCE
Get PDFThe present study aimed to compare the effects of mixed-training with different proportions of concentric velocity loss (10% vs. 30%) on muscular strength and explosive performance. Twenty healthy trained men were recruited and randomly assigned to the velocity loss of 10% (VL10) and velocity loss of 30% (VL30) for eight weeks of mixed-training. The participants performed 1RM in back squat, countermovement jump (CMJ), 10-m (T10) and 20-m (T20) sprint running before and after mixed-training. Both groups showed similar improvement in the 1RM strength (9.6% vs 9.3%). However, only the VL10 group significantly improved CMJ (6.2%), T10 (-1.7%), and T20 (-1.3%) after training. In this study, controlling the velocity loss at a lower percentage (10%) was more advantageous for explosive performance
DIFFERENCES BETWEEN PARALLEL SKIING AND CARVING BASED ON WEARABLE SENSOR DATA AND TECHNIQUE ANALYSIS ALGORITHMS
Get PDFThe purpose of this study was to objectively identify differences between conventional parallel skiing (side-skidding) and carving (no side-skidding) with regard to selected movement actions of the upper body and their influences on movement stability. Comparison of the two skiing styles is approached by a set of quantifiable technique metrics (lateral, horizontal and rotational movement of the upper body), extracted as principal components (PCs) from whole-body wearable sensor data of highly experienced skiers (n=20). Stability was quantified through normalized jerk scores. Carving involved increased angulation of the hip in the transition phase, a more posterior body posture over the whole skiing turn cycle, and less upper body rotation in the steering phase. In all technique elements carving was more stable (lower jerk score) compared to parallel ski steering
VARIABILITY OF SAGITTAL JOINT KINEMATICS OF FEMALE HORSE-RIDERS OVER A JUMP.
Get PDFThis study aimed to improve understanding of horse-rider technique in show jumping, to support the development of training programs. Range of motion, peak flexion and extension angles were estimated for the shoulder, elbows, hips, knees, and ankles of six female riders jumping two different fence types (oxer and straight), using a full-body inertial motion unit (IMU) suit (MVN Awinda). Horse kinematics were recorded using IMU and GPS technology (Alogo Move Pro). All rider joints showed inter-participant (population standard deviation range: 5.4°(ankle) - 43.2° (elbow)) and intra-participant variability (individual SD range: 1.7°(ankle) - 57.5°(hips)). Findings suggest differences in riding strategies and/or in strategy execution, challenging the traditional, strict equestrian guidelines, and highlighting the need for greater characterisation of show jumping strategies
ADAPTATION OF WALKING PATTERNS TO BILATERAL LOADED WALKING
Get PDFMotor adaptation is the process of adjusting motor commands to perform a movement task under altered conditions. The ability and time needed to adapt to an exoskeleton may be crucial to their acceptance and effectiveness. The mechanical changes with exoskeletons are multi-faceted. Therefore, this study focused only on the additional mass and aimed to investigate motor adaptation to bilaterally loaded walking. Six females and six males (24.6±3.8y; 173.3±9.4cm; 66.4±10.1kg) walked with and without weight cuffs attached to their thighs and shanks on a treadmill. Spatio-temporal parameters and lower-limb sagittal angles did not show the hypothesized adaptation progressions and after-effects. Yet, angle-angle diagrams exhibited patterns that may reflect adaptation. Adaptation may occur in the interplay of the lower limb segments, reflecting underlying motor control processes
SHOULDER-ELBOW COORDINATION PATTERN DURING BADMINTON FOREHAND DRIVE IN TRAINED AND UNTRAINED PEOPLE
Get PDFThe purpose of this study was to compare shoulder and elbow coordination patterns in the transverse plane between trained and untrained people during badminton forehand drives. The coupling angles and phases of the shoulder and elbow in the transverse plane from peak shoulder external rotation to impact time were analyzed using vector coding. Due to the limited sample size, we reported results from descriptive analyses instead of statistical analyses. We found that the trained people exhibited a tendency of larger range of shoulder and elbow motions and more in-phase coordination patterns with shoulder internal rotation dominancy in the transverse plane than the untrained people during badminton forehand drives. Our results can provide coaches with insights into the importance of multi-joint coordination and offer background knowledge about coupling angles and phases
RELATIONSHIP BETWEEN KINEMATIC SEQUENCE CHARACTERISTICS, UPPER EXTREMITY JOINT WORK, AND FREE-THROW SHOOTING ACCURACY
Get PDFThis study investigates the relationship between kinematic sequence variables and upper extremity joint work in basketball free-throw shooting. Thirty-four participants performed free-throw shots, analyzed using a 3D markerless motion capture system (ENABLE). The study focused on the timing of peak segmental angular velocities and their relation to joint work in the shooting shoulder and elbow. Significant correlations were found between the timing of peak angular velocities and upper extremity joint work. The findings suggest that proficient basketball shooters demonstrate a more efficient kinematic sequence, characterized by longer duration of time between knee, pelvis, and elbow peak angular velocities and reduced upper extremity workload. This study underscores the importance of understanding the biomechanics of shooting for training and skill development in basketball