Cue usage in volleyball : a time course comparison of elite, intermediate and novice female players

This study compared visual search strategies in adult female volleyball players of three levels. Video clips of the attack of the opponent team were presented on a large screen and participants reacted to the final pass before the spike. Reaction time, response accuracy and eye movement patterns were measured. Elite players had the highest response accuracy (97.50 ± 3.5%) compared to the intermediate (91.50 ± 4.7%) and novice players (83.50 ± 17.6%; p<0.05). Novices had a remarkably high range of reaction time but no significant differences were found in comparison to the reaction time of elite and intermediate players. In general, the three groups showed similar gaze behaviour with the apparent use of visual pivots at moments of reception and final pass. This confirms the holistic model of image perception for volleyball and suggests that expert players extract more information from parafoveal regions

The efficacy of a brief hazard perception interventional program for child bicyclists to improve perceptive standards

Introduction: Even though child bicyclists are highly vulnerable in traffic only few studies focused on providing child bicyclists with means to enhance their abilities to deal with the complexity of dynamic traffic situations. The current study therefore evaluated whether a brief hazard perception intervention might be effective to improve hazard perception skills in child bicyclists towards a level more comparable to adult bicyclists. Methods: Eighty children of the fourth grade (9.03 +/- 0.43 years; 34 girls) and forty-six adults (34.67 +/- 14.25 years age; 24 woman) first performed a Hazard Perception test for bicyclists. Response rate, reaction times, first fixation, duration of the first fixation, dwell time and total number of fixations on the events were measured. Next, the children took part in the HP intervention in which video clips of dangerous traffic situations were presented. The intervention comprised two classroom sessions of one hour (1/week). A post-test was performed one day after and the retention-test three weeks after the intervention. Results: Children responded to more covert hazards immediately after the intervention (p < 0.05), but did not improve their response rate for overt hazards. Reaction times for the covert hazards improved on the post-test (p < 0.001) compared to the pre-test but this effect was reduced on the retention test. There was no effect of the intervention for entry time of the first fixation but the duration of the first fixation increased for the covert hazards (p < 0.05). Children made fewer fixations on the event compared to adults (p < 0.001), except for the covert hazards on the retention-test. The training also increased the number of fixations for the overt hazards on the post-test (p < 0.001) and the retention-test (p < 0.001) but only increased on the retention test for the covert hazards (p < 0.001). Conclusion: The results demonstrated that a brief intervention for training hazard perception skills in child bicyclists is able to improve children's situation awareness and hazard perception for potential dangerous situations. The training, however, was too short to improve children to higher adult levels

The ability to correct an on-going action : accuracy and correction time in elite fencing

Background and Study Aim: Performing an attack in fencing takes fractions of a second implying that there is little time to correct an on-going movement to anticipate the opponent's action. Studies in the lab evaluated correction times in artificial tasks but stand in shrill contrast to elite sports where via extensive training, motor programs are mastered and perfected. This study aim was to expand the knowledge on the capability of elite fencers to correct an on-going attack on a central target when the target suddenly changes position at random time intervals. Material and Methods: Eight elite fencers ( 7 males, 18.3 +/- 4.66 years) performed a fente at a target as fast and accurate as possible. In 80% of the trials, a new target light was lit during the fente, and the fencers had to adjust their movement to hit the new illuminated target. Correction times were set at 100ms, 170ms, 240ms, 310ms or 380ms before the estimated epee-target contact. The number of successful adjustments and the radial error was reported. Results: With increasing correction times (p<0.01), radial error decreased. Based on the correction times, the inflexion point was determined at 277ms. It was demonstrated that correction time influenced the number of adjusted trials (p<0.01). Fencers were able to adjust more trials when correction times were set at 310ms and 380ms (p<0.01). Conclusions: Correction times in humans, which are often measured in laboratory settings, appear to apply for sports situations as well. A quarter of a second is sufficient to correct an on-going movement in which the whole body is involved subtle but effectively when the target unexpectedly changes position

Personality traits, risky riding behaviors and crash-related outcomes: findings from 5,778 cyclists in 17 countries

The last few years have brought about a series of substantial changes for mobility on two wheels, especially if the impact of the COVID-19 pandemic is considered as a relevant fact for transportation dynamics [1,2]. Social distancing recommendations have promoted the use of individual transportation systems instead of massive transportations means. Consequently, riding a bike for urban trips has become increasingly prevalent in many countries [3-5]. Besides an opportunity to make urban mobility more active and sustainable, this panorama poses the challenge to prevent that, along with its growing use, bicycle crashes ---and their consequences-might continue to increase. In this regard, recent studies have emphasized the role of individual differences and personality-related factors as potential issues influencing both cycling behaviors and traffic crashes suffered while riding [6,7]

Cross-culturally approaching the cycling behaviour questionnaire (CBQ) : Evidence from 19 countries

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