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Supej, M., Kalén, A., Verdel, N., Ogrin, J. & Holmberg, H.-C. (2023). The Contribution of Ski Poles to Aerodynamic Drag in Alpine Skiing. Applied Sciences, 13(14), Article ID 8152.
Open this publication in new window or tab >>The Contribution of Ski Poles to Aerodynamic Drag in Alpine Skiing
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2023 (English)In: Applied Sciences, E-ISSN 2076-3417, Vol. 13, no 14, article id 8152Article in journal (Refereed) Published
Abstract [en]

The present study was designed to determine the contribution of the cross-sectional area of the ski poles (Sp) to the total aerodynamic drag during alpine skiing. At three different wind speeds in a wind tunnel, 10 skiers assumed typical alpine skiing postures (high, middle, and tuck), and their frontal aerodynamic drag was assessed with a force plate and their cross-sectional area, along with that of their ski poles, determined by interactive image segmentation. The data collected were utilized to examine intra-subject variation in Sp, the effects of Sp on the coefficient of aerodynamic drag (Cd), and the product of Cd and total cross-sectional area (Cd∙S. The major findings were as follows: (i) Sp ranged from 0.0067 (tuck position) to 0.0262 m2 (middle position), contributing 2.2–4.8% of the total cross-sectional area, respectively; (ii) Sp was dependent on wind speed in the high and middle positions; (iii) intra-subject variations ranged from 0.0018 m2 (27.6%) in the tuck position to 0.0072 m2 (30.5%) in the high position; (iv) Sp exerted a likely effect on Cd and Cd∙S. The extensive intra- and inter-skier variability in Sp can account for as much as ~5% of the total frontal cross-sectional area and future investigations on how elite skiers optimize their positioning of the poles in a manner that reduces aerodynamic drag are warranted. 

Place, publisher, year, edition, pages
MDPI, 2023
Keywords
air resistance, biomechanics, coefficient of aerodynamic drag, cross-sectional area, force, kinetics, ski posture, skiing position, tuck, wind tunnel
National Category
Sport and Fitness Sciences Infrastructure Engineering
Research subject
Skövde Artificial Intelligence Lab (SAIL)
Identifiers
urn:nbn:se:his:diva-23081 (URN)10.3390/app13148152 (DOI)001034927500001 ()2-s2.0-85166252045 (Scopus ID)
Note

CC BY 4.0

© 2023 by the authors.

Correspondence: matej.supej@fsp.uni-lj.si; Tel.: +386-1-520-77-00

This research was funded by the Slovenian Research Agency (P5-0147).

Available from: 2023-08-10 Created: 2023-08-10 Last updated: 2023-10-10Bibliographically approved
Lundkvist, E., Gustafsson, H., Madigan, D., Hjälm, S. & Kalén, A. (2023). The Prevalence of Emotional Exhaustion in Professional and Semiprofessional Coaches. Journal of Clinical Sport Psychology, 17(4), 376-389
Open this publication in new window or tab >>The Prevalence of Emotional Exhaustion in Professional and Semiprofessional Coaches
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2023 (English)In: Journal of Clinical Sport Psychology, ISSN 1932-9261, E-ISSN 1932-927X, Vol. 17, no 4, p. 376-389Article in journal (Refereed) Published
Abstract [en]

The present study examined levels of emotional exhaustion, a key symptom of burnout, in Swedish professional and semiprofessional sport coaches in comparison to the normative values specified in the Maslach Burnout Inventory manual, and to the clinical cutoffs developed by Kleijweg, Verbraak, and Van Dijk. The sample contained 318 Swedish coaches (M age = 42.7 years, 12% female) working at least 50% full time away from both team (60%) and individual (40%) sports. Our study shows that, in general, coaches in this sample experience lower average levels of exhaustion than normative samples both regarding the Maslach Burnout Inventory and clinical cutoffs. Two groups of coaches did, however, stand out. Coaches living in single households as well as coaches working part time had higher risk of severe levels of emotional exhaustion. These results place coach exhaustion levels in relation to other occupations and highlight that in this sample, the coaching profession does not stand out as more emotionally exhausting than other occupations.

Place, publisher, year, edition, pages
Human Kinetics, 2023
Keywords
burnout, sport coaching, elite sport, stress
National Category
Sport and Fitness Sciences
Research subject
Skövde Artificial Intelligence Lab (SAIL)
Identifiers
urn:nbn:se:his:diva-21024 (URN)10.1123/jcsp.2021-0039 (DOI)000928515500001 ()2-s2.0-85178340352 (Scopus ID)
Note

© 2022 Human Kinetics

Lundkvist (erik.lundkvist@umu.se) is corresponding author, https://orcid.org/0000-0002-2869-8995.

First Published Online: 15 Mar 2022

Available from: 2022-04-04 Created: 2022-04-04 Last updated: 2023-12-13Bibliographically approved
Alonso-Calvete, A., Lorenzo-Martínez, M., Padrón-Cabo, A., Pérez-Ferreirós, A., Kalén, A., Abelairas-Gómez, C. & Rey, E. (2022). Does Vibration Foam Roller Influence Performance and Recovery?: A Systematic Review and Meta-analysis. Sports Medicine - Open, 8(1), Article ID 32.
Open this publication in new window or tab >>Does Vibration Foam Roller Influence Performance and Recovery?: A Systematic Review and Meta-analysis
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2022 (English)In: Sports Medicine - Open, ISSN 2199-1170, Vol. 8, no 1, article id 32Article, review/survey (Refereed) Published
Abstract [en]

Background: Foam rolling has been extensively investigated, showing benefits in performance and recovery. Recently, vibration has been added to foam rollers, with hypothesized advantages over conventional foam rollers. However, there is no systematic evidence in this regard.

Objective: To carry out a systematic review and meta-analysis about the effects of vibration foam roller (VFR) on performance and recovery.

Methods: A systematic search was conducted in PubMed/MEDLINE, Web of Science and SportDiscus according to the PRISMA guidelines. The outcomes included performance (jump, agility and strength) and recovery variables (blood flow, pain and fatigue) measured after an intervention with VFR. The methodological quality was assessed with the PEDro scale. A random-effects model was used to perform the meta-analysis.

Results: Initially, 556 studies were found and after the eligibility criteria 10 studies were included in the systematic review and 9 in the meta-analysis. There was no significant effects on jump performance (SMD = 0.14 [95% CI − 0.022 to 0.307]; p = 0.101; I2 = 1.08%) and no significant beneficial effects were reported on isokinetic strength (SMD = 0.16 [95% CI − 0.041 to 0.367]; p = 0.117; I2 = 9.7%). Recovery appears to be enhanced after VFR interventions, but agility does not seem to increase after VFR interventions.

Conclusion: This systematic review and meta-analysis suggest that VFR could have great potential for increasing jump performance, agility, strength and enhancing recovery. Further research is needed to confirm the effects of VFR on performance and recovery.

Trial Registration This investigation was registered in PROSPERO with the code CRD42021238104.

Place, publisher, year, edition, pages
Springer, 2022
National Category
Sport and Fitness Sciences
Research subject
Skövde Artificial Intelligence Lab (SAIL)
Identifiers
urn:nbn:se:his:diva-20964 (URN)10.1186/s40798-022-00421-2 (DOI)000764733600002 ()35244802 (PubMedID)2-s2.0-85126054039 (Scopus ID)
Note

CC BY 4.0

Correspondence: a.cabo@udc.es

No sources of funding were used to assist in the preparation of this article.

Available from: 2022-03-08 Created: 2022-03-08 Last updated: 2022-04-22Bibliographically approved
Luz Gámiz, M., Kalén, A., Nozal-Cañadas, R. & Raya-Miranda, R. (2022). Statistical supervised learning with engineering data: A case study of low frequency noise measured on semiconductor devices. The International Journal of Advanced Manufacturing Technology, 120(9-10), 5835-5853
Open this publication in new window or tab >>Statistical supervised learning with engineering data: A case study of low frequency noise measured on semiconductor devices
2022 (English)In: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, Vol. 120, no 9-10, p. 5835-5853Article in journal (Refereed) Published
Abstract [en]

Our practical motivation is the analysis of potential correlations between spectral noise current and threshold voltage from common on-wafer MOSFETs. The usual strategy leads to the use of standard techniques based on Normal linear regression easily accessible in all statistical software (both free or commercial). However, these statistical methods are not appropriate because the assumptions they lie on are not met. More sophisticated methods are required. A new strategy based on the most novel nonparametric techniques which are data-driven and thus free from questionable parametric assumptions is proposed. A backfitting algorithm accounting for random effects and nonparametric regression is designed and implemented. The nature of the correlation between threshold voltage and noise is examined by conducting a statistical test, which is based on a novel technique that summarizes in a color map all the relevant information of the data. The way the results are presented in the plot makes it easy for a non-expert in data analysis to understand what is underlying. The good performance of the method is proven through simulations and it is applied to a data case in a field where these modern statistical techniques are novel and result very efficient.

Place, publisher, year, edition, pages
Springer Nature Switzerland AG, 2022
Keywords
1/f Noise, Backfitting algorithm, Bootstrap, MOSFET, SiZer Map, Statistical modeling
National Category
Probability Theory and Statistics Signal Processing Nano Technology
Research subject
Skövde Artificial Intelligence Lab (SAIL)
Identifiers
urn:nbn:se:his:diva-21025 (URN)10.1007/s00170-022-08949-z (DOI)000777644800002 ()2-s2.0-85128289200 (Scopus ID)
Note

CC BY 4.0

© 2022 Springer Nature Switzerland AG. Part of Springer Nature.

Published: 04 April 2022

Corresponding author: María Luz Gámiz

Funding for open access charge: Universidad de Granada / CBUA

This work was supported in part by the Spanish Ministry of Science and Innovation through grants number RTI2018-099723-B-I00, and PID2020-120217RB-I00; the Spanish Junta de Andalucíathrough grants number B-FQM-284-UGR20 and B-CTS-184-UGR20;  and the IMAG-Maria de Maeztu grant CEX2020-001105-/AEI/10.13039/501100011033.

Available from: 2022-04-04 Created: 2022-04-04 Last updated: 2022-07-12Bibliographically approved
Gil-Campos, M., Pérez-Ferreirós, A., Llorente-Cantarero, F. J., Anguita-Ruiz, A., Bedoya-Carpente, J. J., Kalén, A., . . . Leis, R. (2021). Association of Diet, Physical Activity Guidelines and Cardiometabolic Risk Markers in Children. Nutrients, 13(9), Article ID 2954.
Open this publication in new window or tab >>Association of Diet, Physical Activity Guidelines and Cardiometabolic Risk Markers in Children
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2021 (English)In: Nutrients, E-ISSN 2072-6643, Vol. 13, no 9, article id 2954Article in journal (Refereed) Published
Abstract [en]

The aim was to identify different dietary and physical activity (PA) patterns in 5- to 14-year-old children with a high prevalence of overweight and obesity using cluster analysis based on their adherence to the Spanish Society of Community Nutrition dietary guidelines and levels of PA, and to determine their associations with age, sex, body composition, and cardiometabolic risk markers. In 549 children, hierarchical cluster analysis was used to identify subgroups with similar adherence to dietary recommendations and level of PA. Three clusters were identified: Cluster 1, with the lowest level of vigorous PA and adherence to dietary recommendations; Cluster 2, with the lowest levels of moderate and vigorous PA and the highest adherence to dietary recommendations; and Cluster 3, with the highest level of PA, especially vigorous PA and a medium level adherence to dietary recommendations. Cluster 3 had lower total body fat and higher lean body mass percentages than Cluster 2. Cluster 2 had lower high-density lipoprotein cholesterol and higher low-density lipoprotein cholesterol levels than Cluster 1. The results from our study suggest that it is important to consider adherence to PA recommendations together with adherence to dietary guidelines to understand patterns of obesogenic habits in pediatric populations with high prevalence of overweight and obesity.

Place, publisher, year, edition, pages
MDPI, 2021
Keywords
abdominal adiposity, cardiovascular diseases, child, child nutrition sciences, diet, exercise, metabolic syndrome, metabolism, obesitypediatric obesity
National Category
Pediatrics
Identifiers
urn:nbn:se:his:diva-20762 (URN)10.3390/nu13092954 (DOI)000701159900001 ()34578831 (PubMedID)2-s2.0-85113302439 (Scopus ID)
Note

CC BY 4.0

Available from: 2021-12-02 Created: 2021-12-02 Last updated: 2023-08-28Bibliographically approved
Martinón-Torres, N., Carreira, N., Picáns-Leis, R., Pérez-Ferreirós, A., Kalén, A. & Leis, R. (2021). Baby-Led Weaning: What Role Does It Play in Obesity Risk during the First Years?: A Systematic Review. Nutrients, 13(3), 1-14, Article ID 1009.
Open this publication in new window or tab >>Baby-Led Weaning: What Role Does It Play in Obesity Risk during the First Years?: A Systematic Review
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2021 (English)In: Nutrients, E-ISSN 2072-6643, Vol. 13, no 3, p. 1-14, article id 1009Article in journal (Refereed) Published
Abstract [en]

Childhood is a window of opportunity for the prevention of the obesity pandemic. Since “the first 1000 days of life” is a period in which healthy eating habits must be acquired, it should be the target for preventive strategies. Baby-led weaning (BLW) is an emergent way of weaning that could influence children’s health. The nutrition committees of the main pediatric societies affirm there is not enough evidence to support which is the best method of weaning. The aim was to determinate the influence of BLW on the infant’s weight gain compared to the traditional spoon-feeding, and to assess if it could decrease the risk of obesity in children. A systematic review was conducted, following the PRISMA method. Pubmed, Web of Science, Embase, and Cochrane Library were searched. Out of 747 articles, eight studies (2875 total infants) were included (two randomized control trials, 6 observational studies). Results were indecisive, while some studies seem to demonstrate lower weight gain in infants that apply BLW, others show inconclusive results. The risk of bias in all included studies was moderate or high. In conclusion, more clinical trials and prospective studies should be done prior to providing a general recommendation about the best method of weaning to reduce the risk of obesity.

Place, publisher, year, edition, pages
MDPI, 2021
Keywords
overweight, weight gain, infants, complementary feeding, body mass index, childhood, infant nutrition, feeding behavior
National Category
Pediatrics
Identifiers
urn:nbn:se:his:diva-20755 (URN)10.3390/nu13031009 (DOI)000633984400001 ()33800994 (PubMedID)2-s2.0-85102718914 (Scopus ID)
Note

CC BY 4.0

Available from: 2021-12-01 Created: 2021-12-01 Last updated: 2023-08-28Bibliographically approved
Kalén, A., Musculus, L., Bisagno, E. & Pérez-Ferreirós, A. (2021). Can tests of cognitive functions or decision making predict sport performance in net and invasion sports?: A meta-analysis. In: Oliver Höner; Svenja Wachsmuth; Martin Leo Reinhard; Florian Schultz (Ed.), Abstract Band Talententwicklung & Coaching im Sport: 53. Jahrestagung der Arbeitsgemeinschaft für Sportpsychologie (asp) Tübingen (online, 13.-15.05.2021). Paper presented at 53. Jahrestagung der Arbeitsgemeinschaft für Sportpsychologie (asp) Tübingen (online, 13.-15.05.2021) (pp. 90-90). Eberhard Karls Universität Tübingen
Open this publication in new window or tab >>Can tests of cognitive functions or decision making predict sport performance in net and invasion sports?: A meta-analysis
2021 (English)In: Abstract Band Talententwicklung & Coaching im Sport: 53. Jahrestagung der Arbeitsgemeinschaft für Sportpsychologie (asp) Tübingen (online, 13.-15.05.2021) / [ed] Oliver Höner; Svenja Wachsmuth; Martin Leo Reinhard; Florian Schultz, Eberhard Karls Universität Tübingen , 2021, p. 90-90Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

One of the psychological factors that have been suggested to influence athletes’ success is their cognitive prerequisites. Recent literature has investigated how sports performance is related to basic cognitive functions (e.g., processing speed and attention), higher cognitive functions (e.g., working memory capacity and inhibition), as well as cognitive skills (e.g., decision making). This research has lead to the—potentially premature—commercialization of products measuring cognitive functions or skills to identify and select talented athletes. The purpose of this meta-analysis was, therefore, to synthesize the research that has examined the relationship between cognitive skills and functions and sporting performance in net and invasion game athletes. Further, we aimed to estimate the ability of cognitive tests to dis- criminate between athletes with better and worse sporting performance. A literature search was performed in Cochrane library, PsychInfo, Pubmed, and Web of Science. We included studies if they were conducted on competitive athletes in net and invasion sports, assessed cognitive prerequisites, and included an individual performance measure related to the sport. 

Thirty-nine studies, with a total of 3438 athletes, met the criteria. The results showed a small effect size for basic (Hedge’s g = 0.43, 95% CI [0.09, 0.75]) and higher cognitive functions (Hedge’s g = 0.29, 95% CI [0.00, 0.62]), and a large effect size for decision making (Hedge’s g = 1.07, 95% CI [0.70, 1.42]); meaning athletes with better sport performance scored higher than athletes with worse sport performance. The probability of superiority indicated that an athlete with better sports performance would outscore an athlete with worse sports performance 63 of 100 times (95% CI [57, 70]) on basic cognitive function tests, 59 of 100 times (95% CI [53, 66]) on higher cognitive function tests, and 78 of 100 times (95% CI [72, 84]) on decision making tests. 

In conclusion, we found that tests of basic and higher cognitive functions had some ability to differentiate between athletes with better and worse sports performance in net and invasion sports on a group level. However, basic and higher cognitive function tests do not seem to be able to predict sports performance on an individual level. Meanwhile, we found that tests of decision making had the best ability to differentiate between athletes with better and worse sports performance on a group level, and some ability to predict the sport performance on an individual level.

Place, publisher, year, edition, pages
Eberhard Karls Universität Tübingen, 2021
National Category
Sport and Fitness Sciences
Identifiers
urn:nbn:se:his:diva-20860 (URN)10.15496/publikation-57943 (DOI)
Conference
53. Jahrestagung der Arbeitsgemeinschaft für Sportpsychologie (asp) Tübingen (online, 13.-15.05.2021)
Available from: 2022-01-14 Created: 2022-01-14 Last updated: 2022-01-17Bibliographically approved
Lorenzo-Martinez, M., Kalén, A., Rey, E., López-Del Campo, R., Resta, R. & Lago-Peñas, C. (2021). Do elite soccer players cover less distance when their team spent more time in possession of the ball?. Science and medicine in football, 5(4), 310-316
Open this publication in new window or tab >>Do elite soccer players cover less distance when their team spent more time in possession of the ball?
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2021 (English)In: Science and medicine in football, ISSN 2473-3938, E-ISSN 2473-4446, Vol. 5, no 4, p. 310-316Article in journal (Refereed) Published
Abstract [en]

Purpose: The aim of this study was to examine the association between the time spent in possession by teams and the match-running performance in elite soccer matches.

Methods: Match performance data were collected from players in Spanish LaLiga (8,468 individual match observations of 412 outfield players) using a multiple-camera computerised tracking system. A k-means cluster analyses classified teams depending on time spent in possession of the ball: very high-percentage ball possession teams (VHPBPT), high-percentage ball possession teams (HPBPT), low-percentage ball possession teams (LPBPT) and very low-percentage ball possession teams (VLPBPT).

Results: Overall, physical indicators were highly associated with ball possession. Distances covered in VHPBPT were lower than HPBPT, LPBPT and VLPBPT, especially at low and medium speed. Position-specific changes were also evident for physical profiles. Attackers (central midfielders, external midfielders and forwards) in VHPBPT covered fewer meters per minute at any speed than their counterparts in HPBPT, LPBPT or VLPBPT. However, defenders (Central defenders and External defenders) in VLPBPT covered lower distances.

Conclusion: These findings may have a great deal of practical implications and may help coaches to better understand match-running variations according to ball possession strategies and could be used to develop a model for predicting the physical activity profile in competition.

Place, publisher, year, edition, pages
Taylor & Francis, 2021
Keywords
Ball possession, playing position, match-running performance, football
National Category
Sport and Fitness Sciences
Identifiers
urn:nbn:se:his:diva-20756 (URN)10.1080/24733938.2020.1853211 (DOI)000596652100001 ()2-s2.0-85097058947 (Scopus ID)
Available from: 2021-12-01 Created: 2021-12-01 Last updated: 2021-12-07Bibliographically approved
Lago-Peñas, C., Kalén, A., Lorenzo-Martinez, M., López-Del Campo, R., Resta, R. & Rey, E. (2021). Do elite soccer players cover longer distance when losing?: Differences between attackers and defenders. International journal of sports science & coaching, 16(3), 840-847
Open this publication in new window or tab >>Do elite soccer players cover longer distance when losing?: Differences between attackers and defenders
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2021 (English)In: International journal of sports science & coaching, ISSN 1747-9541, E-ISSN 2048-397X, Vol. 16, no 3, p. 840-847Article in journal (Refereed) Published
Abstract [en]

This study aimed to evaluate the effects playing position, match location (home or away), quality of opposition (strong or weak), effective playing time (total time minus stoppages), and score-line on physical match performance in professional soccer players using a large-scale analysis. A total of 10,739 individual match observations of outfield players competing in the Spanish La Liga during the 2018–2019 season were recorded using a computerized tracking system (TRACAB, Chyronhego, New York, USA). The players were classified into five positions (central defenders, players = 94; external defenders, players = 82; central midfielders, players = 101; external midfielders, players = 72; and forwards, players = 67) and the following match running performance categories were considered: total distance covered, low-speed running (LSR) distance (0–14 km · h−1), medium-speed running (MSR) distance (14–21 km · h−1), high-speed running (HSR) distance (>21 km · h−1), very HSR (VHSR) distance (21–24 km · h−1), sprint distance (>24 km · h−1) Overall, match running performance was highly dependent on situational variables, especially the score-line condition (winning, drawing, losing). Moreover, the score-line affected players running performance differently depending on their playing position. Losing status increased the total distance and the distance covered at MSR, HSR, VHSR and Sprint by defenders, while attacking players showed the opposite trend. These findings may help coaches and managers to better understand the effects of situational variables on physical performance in La Liga and could be used to develop a model for predicting the physical activity profile in competition.

Place, publisher, year, edition, pages
Sage Publications, 2021
Keywords
Association football, performance analysis, time-motion analysis
National Category
Sport and Fitness Sciences
Identifiers
urn:nbn:se:his:diva-20758 (URN)10.1177/1747954120982270 (DOI)000608799800001 ()2-s2.0-85097996184 (Scopus ID)
Available from: 2021-12-01 Created: 2021-12-01 Last updated: 2021-12-08Bibliographically approved
Kalén, A., Pérez-Ferreirós, A., Costa, P. B. & Rey, E. (2021). Effects of age on physical and technical performance in National Basketball Association (NBA) players. Research in Sports Medicine: An International Journal, 29(3), 277-288
Open this publication in new window or tab >>Effects of age on physical and technical performance in National Basketball Association (NBA) players
2021 (English)In: Research in Sports Medicine: An International Journal, ISSN 1543-8627, E-ISSN 1543-8635, Vol. 29, no 3, p. 277-288Article in journal (Refereed) Published
Abstract [en]

This study evaluated the effects of age on physical and technical game performance for different positions in professional basketball players. In this cross-sectional study, a total of 25,523 individual match observations were undertaken on players from the 2018–19 NBA season. The players were classified into four age groups (19–22 years, 23–25 years, 26–29 years, and 30–42 years). Differences in physical and technical match performance were analysed for the following variables: distance covered, average speed, minutes played, points scored and playing efficiency. The results showed that players older than 30 covered shorter distance and had lower average speed than younger players, that guards and forwards older than 26 played more minutes per game than younger ones, and that guards older than 26 scored more points and were more efficient than younger one, while centres age 23–25 scored more points per games than centres older than 30. In conclusion, physical performance declined with age, and while playing time and technical performance generally remained stable or increased, especially for guards. However, there was some evidence of decline for centres.

Place, publisher, year, edition, pages
Taylor & Francis, 2021
Keywords
Team sport, player tracking, ageing, work rate, playing position
National Category
Sport and Fitness Sciences
Identifiers
urn:nbn:se:his:diva-20757 (URN)10.1080/15438627.2020.1809411 (DOI)000563418500001 ()32847370 (PubMedID)2-s2.0-85089957742 (Scopus ID)
Available from: 2021-12-01 Created: 2021-12-01 Last updated: 2021-12-08Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-8519-6596

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