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Medernach JP, Sanchez X, Henz J, Memmert D. Cognitive-behavioural processes during route previewing in bouldering. PSYCHOLOGY OF SPORT AND EXERCISE 2024; 73:102654. [PMID: 38740079 DOI: 10.1016/j.psychsport.2024.102654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 04/22/2024] [Accepted: 04/23/2024] [Indexed: 05/16/2024]
Abstract
INTRODUCTION In the Olympic climbing discipline of bouldering, climbers can preview boulders before actually climbing them. Whilst such pre-climbing route previewing is considered as central to subsequent climbing performance, research on cognitive-behavioural processes during the preparatory phase in the modality of bouldering is lacking. The present study aimed at extending existing findings on neural efficiency processes associated with advanced skill level during motor activity preparation by examining cognitive-behavioural processes during the previewing of boulders. METHODS Intermediate (n = 20), advanced (n = 20), and elite (n = 20) climbers were asked to preview first, and then attempt two boulders of different difficulty levels (boulder 1: advanced difficulty; boulder 2: elite difficulty). During previewing, climbers' gaze behaviour was gathered using a portable eye-tracker. RESULTS Linear regression revealed for both boulders a significant relation between participants' skill levels and both preview duration and number of scans during previewing. Elite climbers more commonly used a superficial scan path than advanced and intermediate climbers. In the more difficult boulder, both elite and advanced climbers showed longer preview durations, performed more scans, and applied less often a superficial scan path than in the easier boulder. CONCLUSION Findings revealed that cognitive-behavioural processes during route previewing are associated with climbing expertise and boulder difficulty. Superior domain-specific cognitive proficiency seems to account for the expertise-processing-paradigm in boulder previewing, contributing to faster and more conscious acquisition of perceptual cues, more efficient visual search strategies, and better identification of representative patterns among experts.
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Affiliation(s)
- Jerry Prosper Medernach
- Institute of Exercise Training and Sport Informatics, German Sport University Cologne, Germany; Institut National de l'Activité Physique et des Sports, Luxembourg.
| | - Xavier Sanchez
- CIAMS, Université d'Orléans, Orléans, France; CIAMS, Université Paris-Saclay, Orsay, France; SAPRéM, Université d'Orléans, Orléans, France
| | - Julian Henz
- Institute of Exercise Training and Sport Informatics, German Sport University Cologne, Germany
| | - Daniel Memmert
- Institute of Exercise Training and Sport Informatics, German Sport University Cologne, Germany
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Medernach JP, Henz J, Memmert D. Mechanisms underlying superior memory of skilled climbers in indoor bouldering. J Sports Sci 2023; 41:1837-1844. [PMID: 38166602 DOI: 10.1080/02640414.2023.2300569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2023] [Accepted: 12/20/2023] [Indexed: 01/05/2024]
Abstract
INTRODUCTION Bouldering is an Olympic climbing discipline that encompasses short climbing sequences, referred to as boulders, set up on low-height bouldering walls. Memory plays a critical role in bouldering, as it allows climbers to develop climbing strategies, to mentally rehearse climbing movements, and to recall climbing holds of boulders. This study extends previous research on memory in climbing and bouldering with the purpose to elucidate potential mechanisms underlying superior memory abilities of skilled climbers. METHODS Sixty climbers with intermediate (n = 20), advanced (n = 20), or elite (n = 20) skill levels were tasked to memorise the climbing holds and movements of a boulder, set up on a spray wall and demonstrated by a bouldering expert. RESULTS Findings revealed a positive relation between the participants' bouldering skills and sport-specific movement knowledge and both, the number of climbing holds and movements they were able to memorise following a two-minute rehearsal period. CONCLUSION Consistent with previous research, bouldering expertise is positively associated with the ability to memorise domain-specific information. Superior memory abilities among skilled climbers appear to be associated with climbing-specific movement knowledge, coupled with better mental visualisation and increased attentional focus towards functional aspects of boulders.
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Affiliation(s)
- Jerry Prosper Medernach
- Institute of Exercise Training and Sport Informatics, German Sport University Cologne, Cologne, Germany
- Institut National de l´Activité Physique et des Sports, Ministry of Sport, Luxembourg
| | - Julian Henz
- Institute of Exercise Training and Sport Informatics, German Sport University Cologne, Cologne, Germany
| | - Daniel Memmert
- Institute of Exercise Training and Sport Informatics, German Sport University Cologne, Cologne, Germany
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Investigating the network structure of domain-specific knowledge using the semantic fluency task. Mem Cognit 2023; 51:623-646. [PMID: 35608782 PMCID: PMC9128323 DOI: 10.3758/s13421-022-01314-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/11/2022] [Indexed: 11/08/2022]
Abstract
Cognitive scientists have a long-standing interest in quantifying the structure of semantic memory. Here, we investigate whether a commonly used paradigm to study the structure of semantic memory, the semantic fluency task, as well as computational methods from network science could be leveraged to explore the underlying knowledge structures of academic disciplines such as psychology or biology. To compare the knowledge representations of individuals with relatively different levels of expertise in academic subjects, undergraduate students (i.e., experts) and preuniversity high school students (i.e., novices) completed a semantic fluency task with cue words corresponding to general semantic categories (i.e., animals, fruits) and specific academic domains (e.g., psychology, biology). Network analyses of their fluency networks found that both domain-general and domain-specific semantic networks of undergraduates were more efficiently connected and less modular than the semantic networks of high school students. Our results provide an initial proof-of-concept that the semantic fluency task could be used by educators and cognitive scientists to study the representation of more specific domains of knowledge, potentially providing new ways of quantifying the nature of expert cognitive representations.
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Marcen-Cinca N, Sanchez X, Otin S, Cimarras-Otal C, Bataller-Cervero AV. Visual Perception in Expert Athletes: The Case of Rock Climbers. Front Psychol 2022; 13:903518. [PMID: 35911052 PMCID: PMC9330107 DOI: 10.3389/fpsyg.2022.903518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Accepted: 06/23/2022] [Indexed: 11/13/2022] Open
Abstract
The purpose of the present study was to examine the visual perception system in expert climbers through a psychophysical optical test in a cross-sectional study. Twenty-seven male participants with an International Rock Climbing Research Association (IRCRA) best on-sight lead skill level ranging between 18 and 27 and a best red-point level ranging between 18 and 29 completed a series of psychophysical optic tests assessing their visual field, visual acuity, and contrast sensitivity. Climbers were divided by their best red-pointed lead level, and, following IRCRA recommendations, two groups were created: an advanced group (IRCRA redpoint level between 18 and 23), and an elite-high elite group (IRCRA redpoint level between 24 and 29). The elite group presented more training days per week (5.25 ± 1.28), best on-sighted lead level (24.63 ± 1.92 IRCRA), and best red-pointed lead level (26.63 ± 2.56 IRCRA) than the advanced group (3.67 ± 0.91 training days per week, 19.50 ± 1.04 IRCRA on-sighted level and 20.67 ± 1.57 IRCRA red-pointed level). Better visual perception outputs were produced by the group of elite climbers in visual field tests; no differences were observed between the two groups for visual acuity and contrast sensitivity tests. Overall, findings indicate that best climbers performed better at the visual perception tasks that tested their visual field. Such better perception from best climbers is discussed given (1) the greater time they spend coercing the visual system during practicing climbing and (2) the specific complexity of the stimuli as they are confronted to harder routes where holds are less perceptible and the time to find best hold sequences is constrained.
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Affiliation(s)
- Noel Marcen-Cinca
- Department of Health Sciences, Universidad San Jorge, Villanueva de Gállego, Spain
- *Correspondence: Noel Marcen-Cinca,
| | - Xavier Sanchez
- Université d’Orléans, Complexité, Innovation et Activités Motrices et Sportives (CIAMS), Orléans, France
- Université Paris-Saclay, Complexité, Innovation et Activités Motrices et Sportives (CIAMS), Orsay, France
- School of Health and Welfare, Halmstad University, Halmstad, Sweden
| | - Sofia Otin
- Department of Ophthalmology, Miguel Servet University Hospital, Zaragoza, Spain
- Aragon Health Sciences Institute (IIS Aragón), Zaragoza, Spain
- Department of Applied Physics, University of Zaragoza, Zaragoza, Spain
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Sugi T, Nițu AM, Ishihara M. The Effect of Simulating Climbing Movements on Rock Memory and Exploratory Movement in Rock Climbing. Percept Mot Skills 2022; 129:528-553. [PMID: 35473481 DOI: 10.1177/00315125221093909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Simulating climbing movements on a given route is important for fluent rock climbing. We investigated the effect of simulated action during rock climbing route finding on memory and exploratory movement. Participants were 12 climbers and 12 non-climbers who completed three experimental tasks: (a) a questionnaire, the Vividness of Movement Imagery Questionnaire-2 (VMIQ-2) for measuring vividness of motor imagery, (b) a memory task requiring recognition of rock climbing holds on the route, and (c) a traversing task requiring participants to climb a given route and count the number of exploratory movements made during climbing. During route finding in the memory/traversing task, we experimentally manipulated the simulative body action with motor imagery. Results showed that the simulative action affected exploratory movement during climbing, but it did not affect memorization of the holds. In the traversing task, climbers showed more exploratory movement when the simulative action was present during route finding, while the non-climbers showed an opposite trend. Moreover, for non-climbers, the effect of the simulative action was modulated by the vividness of kinesthetic imagery. We concluded that simulative body action during route finding facilitated motor imagery and spatial information processing for subsequent climbing involving exploratory movement.
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Affiliation(s)
- Takahiro Sugi
- Graduate School of Humanities [Psychology], 12944Tokyo Metropolitan University, Hachioji, Japan
| | | | - Masami Ishihara
- Graduate School of Humanities [Psychology], 12944Tokyo Metropolitan University, Hachioji, Japan
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The practice of speleology: What is its relationship with spatial abilities? Cogn Process 2022; 23:217-233. [PMID: 35099658 PMCID: PMC9072483 DOI: 10.1007/s10339-022-01075-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Accepted: 01/11/2022] [Indexed: 11/03/2022]
Abstract
Given the evidence of motor and exploring activities being related to spatial abilities on different scales, the present study considers the case of speleology, a peculiar underground exploratory activity. The relation of this practice with spatial abilities was examined. The study compares a group of expert speleologists (18), a group with a reduced amount of experience in speleology (19 novice speleologists), and a group with a similar amount of practice but in the outdoors (19 experts mountaineers). Group differences will be investigated in terms of (i) small-scale spatial task performance (rotation-based and spatial working memory); (ii) large-scale environment learning (reproduced using verbal descriptions) asking participants to learn a path through a cave or up a mountain (in a counterbalanced order) and then to test their recall with true/false spatial questions and graphical representation tasks; and (iii) self-reports of wayfinding attitudes. The results of linear models showed that, after controlling for age, gender, years of education, and vocabulary scores, expert speleologists had greater mental rotation and perspective-taking abilities and less spatial anxiety than expert mountaineers, and the former performed the true/false questions better than the latter. It should be noted that participants who reported having guiding/path-finding experiences had greater accuracy in graphical representation performance and higher scores in attitude towards orientation. Overall, expertise in speleology is related to spatial abilities on different scales and might have a distinctive role in comparison with other motor practices, pointing to the potential value of examining speleology in the spatial cognition framework.
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Influence of On-Sight and Flash Climbing Styles on Advanced Climbers' Route Completion for Bouldering. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph182312594. [PMID: 34886320 PMCID: PMC8657215 DOI: 10.3390/ijerph182312594] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Revised: 11/25/2021] [Accepted: 11/26/2021] [Indexed: 12/03/2022]
Abstract
Route previewing has been established as a critical parameter in indoor climbing performance, as it could determine the success or failure in ascending the route. We addressed the effect of different types of previews on output climbing performance. Twenty-one advanced climbers (7b and 7c+ climbing grade) were required to complete 18 routes, rated at 6c, according to the French Rating Scale of Difficulty. Each climber previewed the route under three conditions: “No-previewing”, “video-model previewing”, and “real-model previewing”. Output climbing performance was assessed in terms of route completion. The results showed differences on output climbing performance between types of preview. Specifically, the climbers achieved more successful attempts at climbing to the “Top” of the wall when inspecting the route with the “real-model previewing” condition, compared to the other conditions of preview. On the contrary, the climbers displayed more failed attempts in climbing the route with the “on-sight” condition, compared to the “flash” styles (“video-model” and “real-model”). The preview of the route, including performance of a real/video-projected model manipulating climbing holds, seems to increase the opportunities to climb the boulder successfully, attuning climbers to information specifying ascending actions. Climbing coaches should reinforce the design of representative training, using flash styles, to promote movement solutions for route completion.
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Carroll C. Female excellence in rock climbing likely has an evolutionary origin. Curr Res Physiol 2021; 4:39-46. [PMID: 34746825 PMCID: PMC8562198 DOI: 10.1016/j.crphys.2021.01.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2020] [Revised: 01/21/2021] [Accepted: 01/25/2021] [Indexed: 11/18/2022] Open
Abstract
The human body is exceptional for many reasons, not the least of which is the wide variety of movements it is capable of executing. Because our species is able to execute so many discrete activities, researchers often disagree on which were the movements most essential to the evolution of our species. This paper continues a recently introduced analysis, that the performance gap between female and male athletes narrows in sports which most reflect the movements humans evolved to do. Here, I examine the performance gap in rock climbing. Female climbers are some of the best in the world irrespective of gender, a trend that is not found in any other major sport. I conclude that the exceptional ability of female rock climbers relative to male rock climbers is further evidence of the existence of sex-blind musculoskeletal adaptations, which developed over the course of human evolution – as a result of external (non-sexual) selection forces – to facilitate essential movements. These adaptations abate some of the general physical sexual dimorphism which exists in humans. This paper provides more evidence that the human body was shaped, in part, by pressure to climb well. Rock climbing is the sport most similar to tree climbing, a movement essential to human development. Multiple women can be found in the list of top 100 rock climbers, a trend not found in any other major sport. Sports with a higher degree of gender equity, may reflect movements with a greater degree of evolutionary importance. Rock climbing’s gender gap provides further evidence that early humans faced external selection pressure to climb well. Thus, the importance of climbing to the survival of humans - even after the onset of genus Homo - may be understated.
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Affiliation(s)
- Collin Carroll
- Columbia University. 2 Broad Street, Westport, CT, 06880, USA
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Villavicencio P, Bravo C, Ibarz A, Solé S. Effects of Acute Psychological and Physiological Stress on Rock Climbers. J Clin Med 2021; 10:jcm10215013. [PMID: 34768532 PMCID: PMC8584542 DOI: 10.3390/jcm10215013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Revised: 09/30/2021] [Accepted: 10/27/2021] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND The aim of this study was to assess the effects that psychological and physiological stressors have on indoor rock climbers, as well as to identify sex differences. METHODS 14 intermediate rock climbers participated in the study, 10 males and 4 females. Mean age was 31 ± 8 years for males and 21 ± 2 years for females. Day 1 consisted of test familiarization and baseline measurements. Day 2 included two test conditions, startle and fatigue, separated by 20 min. In the startle condition, participants had to lead climb a route, and a loud audio stimulus was presented near the top of the climb. In the fatigue condition, participants were required to climb as fast as they could until muscular failure. The competitive state anxiety inventory second review (CSAI-2R) questionnaire was used to assess somatic anxiety, cognitive anxiety, and self-confidence. The four-square step test (FSST) was used to assess motor control, and cortisol levels were acquired via passive drool (PD). RESULTS Cortisol concentrations were highest in the pre-startle condition (1.72 μg/dL ± 0.66), and values decreased post-startle (1.67 μg/dL ± 0.74) and post-fatigue (1.42 μg/dL ± 0.72). However, cortisol concentrations increased post-startle in females (1.57 μg/dL ± 0.96). Somatic anxiety in males was significantly higher post-startle (16.36 ± 5.54) than pre-startle (14.23 ± 5.09). Females had significantly higher somatic anxiety post-startle (18.00 ± 8.76), and they had lower self-confidence levels (30.00 ± 5.89) than males. CONCLUSIONS There are differences in the way that males and females prepare and respond to stressful situations. Furthermore, time of day may have had a significant impact on cortisol concentrations.
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Affiliation(s)
- Pamela Villavicencio
- Master Program Integrative Physiology, University of Barcelona, 08028 Barcelona, Spain;
| | - Cristina Bravo
- Department of Nursing and Physiotherapy, University of Lleida, 25198 Lleida, Spain;
- Research Group of Health Care (GRECS), Institute of Biomedical Research Center, 25198 Lleida, Spain
- Correspondence:
| | - Antoni Ibarz
- Department of Cellular Biology, Physiology and Immunology, Faculty of Biology, University of Barcelona, 08028 Barcelona, Spain;
| | - Silvia Solé
- Department of Nursing and Physiotherapy, University of Lleida, 25198 Lleida, Spain;
- Research Group of Health Care (GRECS), Institute of Biomedical Research Center, 25198 Lleida, Spain
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The influence of skill and task complexity on perception of nested affordances. Atten Percept Psychophys 2021; 83:3240-3249. [PMID: 34414530 PMCID: PMC8550654 DOI: 10.3758/s13414-021-02355-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/11/2021] [Indexed: 11/09/2022]
Abstract
This study investigated how skill level and task complexity influence the calibration of perception–action and particularly how close an individual acts relative to his or her maximal action capabilities. Complexity was manipulated between two (Touch, Grasp) and more than two (Removing, Moving Up) nested affordance conditions. For all conditions, we examined whether advanced climbers had greater maximal action capabilities than intermediate climbers or whether they better scaled their action (i.e., acted nearer to their maximal action capabilities) or both. Eleven intermediate and 11 advanced male climbers were first asked to estimate the maximum distance that they could reach a climbing hold. The hold was moved along a slide and fixed once requested by the participant; subsequently, the distance to the starting hold was measured. After each estimation, the participant was required to execute the climbing action. After four estimation-action trials in each of the four conditions, the maximal action capability (i.e., actual maximal reaching distance) was determined. Advanced climbers demonstrated greater actual maximal reaching distances than intermediate climbers for all conditions, but they only estimated greater maximal reaching distances for the more complex conditions, which featured more than two nested affordances. When estimated maximal reaching distances were scaled to actual maximal reaching distances, advanced climbers did not differ from intermediate climbers for any condition, and there were no differences between conditions. Our findings indicate that expertise was a function of greater action capabilities, but not due to the accuracy of calibration.
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Medernach JP, Memmert D. Effects of decision-making on indoor bouldering performances: A multi-experimental study approach. PLoS One 2021; 16:e0250701. [PMID: 33983977 PMCID: PMC8118292 DOI: 10.1371/journal.pone.0250701] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Accepted: 04/13/2021] [Indexed: 11/23/2022] Open
Abstract
The purpose of this study was to investigate whether novice, intermediate, and advanced bouldering athletes would differ in their decision-making abilities and to what extent distinct problem-solving tactics would affect the athletes’ bouldering performances. Seventy-seven male bouldering athletes participated in a multi-experimental study with the conceptual replication of three bouldering tasks. Participants were allocated according to their ability levels to the novice group (NOV with n = 18), the intermediate group (INT with n = 18), or the advanced group (ADV with n = 41). The data collected for movement analysis via video consisted of the pre-ascent decision-making times, the number of movement deviations from the best solution, the number of movement mistakes, the average gripping times, the bouldering times to the top, the number of successful ascents, and the number of attempts to complete the tasks. Results among all three experiments revealed shorter decision-making times, fewer movement mistakes, and shorter average gripping and bouldering times to the top in the ADV group than in the NOV group and the INT group. Furthermore, participants from the ADV group demonstrated fewer movement deviations than participants from the NOV group (in all three experiments) and the INT group (Experiment 1 and Experiment 2). Moreover, participants from the ADV group and the INT group were characterized, in all three experiments, by a higher number of successful ascents and a lower number of attempts to complete the tasks than participants from the NOV group. In total, these findings emphasize that accomplished decision-making abilities consist of a key determinant in successful indoor bouldering performances.
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Affiliation(s)
- Jerry Prosper Medernach
- Institute of Exercise Training and Sports Informatics, German Sport University Cologne, Cologne, Germany
- * E-mail:
| | - Daniel Memmert
- Institute of Exercise Training and Sports Informatics, German Sport University Cologne, Cologne, Germany
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Heilmann F. Executive Functions and Domain-Specific Cognitive Skills in Climbers. Brain Sci 2021; 11:brainsci11040449. [PMID: 33915988 PMCID: PMC8066095 DOI: 10.3390/brainsci11040449] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 03/27/2021] [Accepted: 03/30/2021] [Indexed: 11/26/2022] Open
Abstract
Athletes in a particular sport have specific cognitive skills acquired due to regular confrontation with sport-specific requirements. Studies show that the particular type of sport carried out and fostered by general physical activity impacts executive functions (EFs) such as inhibition, working memory, and cognitive flexibility. There are inconsistent results on the connections between domain-specific cognitive skills and executive functions. This study aimed to evaluate the relations between EFs and domain-specific cognitive skills in climbing. Due to that, we examined the executive functions (neuropsychological tests) and domain-specific cognitive skills (climbing-specific test: a preview of the route vs. climbed moves; climbed moves vs. recognition of moves) of 19 climbers (10 novices, 9 experts, grades 5 to 6a vs. 6c+ to 7b). The inter-subject effects analysis shows that novices and experts in sport climbing do not differ in executive functions in this particular case. Concerning domain-specific cognitive skills, there are differences between experts and novices. Experts show a significantly higher level in planning performance or route idea (p < 0.001) as well as in memorizing of climbed moves (p = 0.004). There are no relations between executive functions and domain-specific cognitive skills in climbers.
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Affiliation(s)
- Florian Heilmann
- Movement Science Group, Institute for Sport Science, Philosophical Faculty II, Martin-Luther University Halle-Wittenberg, 06108 Halle (Saale), Germany
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