Global Navigation Satellite Systems (GNSS) are, in addition to being most widely used vehicle navigation method, becoming popular in sport-related tests. There is a lack of knowledge regarding tracking speed using GNSS, therefore the aims of this study were to examine in dynamic conditions: 1) how accurate technologically different GNSS measure speed and 2) how large is latency in speed measurements in real time applications. Five GNSSs were tested. They were fixed to a car’s roof-rack: a smart phone, a wrist watch, a handheld device, a professional system for testing vehicles and a high-end Real Time Kinematics (RTK) GNSS. The speed data were recorded and analyzed during rapid acceleration and deceleration as well as at steady speed. The study produced four main findings. Higher frequency and high quality GNSS receivers track speed at least at comparable accuracy to a vehicle speedometer. All GNSS systems measured maximum speed and movement at a constant speed well. Acceleration and deceleration have different level of error at different speeds. Low cost GNSS receivers operating at 1 Hz sampling rate had high latency (up to 2.16 s) and are not appropriate for tracking speed in real time, especially in dynamic movements.
COBISS.SI-ID: 4595377
We analysed video footage and categorized 5024 different basketball shots from 40 basketball games and 5 different levels of competitive basketball (National Basketball Association (NBA), Euroleague, Slovenian 1st Division, and two Youth basketball competitions). Statistical analysis with hierarchical multinomial logistic regression models reveals that there are substantial differences between competitions. However, most differences decrease or disappear entirely after we adjust for differences in situations thatarise in different competitions (shot location, player type, and attacks in transition). Differences after adjustment are mostly between the Senior and Youth competitions: more shots executed jumping or standing on one leg, more uncategorised shot types, and more dribbling or cutting to the basket in the Youth competitions, which can all be attributed to lesser technical and physical ability of developing basketball players.
COBISS.SI-ID: 4684209
The aim was to determine the impact of the steepness of the slope on the biomechanics of World Cup slalom ski racers. We collected threedimensional kinematic data during a World Cup race from 10 male slalom skiers throughout turns performed on a relatively flat (19.8°) and steep (25.2°) slope under otherwise similar course conditions. Kinematic data revealed differences between the two slopes regarding the turn radii of the skis and center of gravity, velocity, acceleration, and differential specific mechanical energy. Examining the time-course behaviors of variables during turn cycles indicated that steeper slopes were associated with slower velocities, but greater accelerations, during turn initiation; narrower turns with peak ground reaction forces concentrated at the midpoint of steering; more pronounced lateral angulations of the knees and hips at the start of steering that later became less pronounced; and overall slower turns which involved deceleration at completion.
COBISS.SI-ID: 4635569
Infrared thermographic imaging (IRTG) is a safe and reliable technology used to monitor skin temperature. The main aim of our study was to evaluate the relationship between skin temperature changes and muscle fatigue in order to answer the main research question if IRTG can be used to monitor muscle fatigue. This was a case study performed on a 23- yearold trained middle distance runner. After warm-up the subject was exercising on the dynamometer for 7.5 min at 120°/s performing only concentric contractions of quadriceps. At the same time IRTG recording of both (exercising and non-exercising) quadriceps was performed. A correlational analysis that was performed in order to quantify the relationship between power and temperature change over time has shown that there is a significant negative correlation between skin temperature increase and power decrease (r = −0.543, p = 0.036) of exercising quadriceps.
COBISS.SI-ID: 4773553
This paper presents the development of sports sociology in Eastern European countries. Exposed are the main dilemmas of research over the last 30 years, a review of the social environment, which affect the individual phenomena in sport (violence, doping, etc.). It also indicates the development of sports sociology in these countries in the future.
COBISS.SI-ID: 4684977