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  • 1. Cardinale, Daniele
    et al.
    Cardinale, Marco
    Nilsson, Johnny
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science.
    Comparison between single and combined data collection methods in loaded squat jump power output2017In: Gazzetta Medica Italiana, ISSN 0393-3660, E-ISSN 1827-1812, Vol. 176, no 6, p. 315-321Article in journal (Refereed)
    Abstract [en]

    BACKGROUND: The aim of this study was to compare linear position transducer force plate-based methods and more complex combinations of those for calculation of power output in loaded squat jump.

    METHODS: Eight methods were used simultaneously in data collection: vertical ground reaction force (VGRF), ground reaction forces (GRF), 1 linear position transducer (1LPT), 1LPT and VGRF (1LPT+VGRF), 2 linear position transducers (2LPTs), 2LPTs and VGRF (2LPTs+VGRF), 5 linear position transducers (5LPTs), 5LPTs and GRF (5LPTs+GRF). Power output was calculated for each lift according to the sensor or sensors used and the results were compared.

    RESULTS: Power output calculated separately with LPTs and GRF method did not differ significantly from combined methods such as 1LPT+VGRF, 2LPTs+VGRF. No significant differences were found when comparing power output between 5LPTs+GRF and combined methods such as 2LPTs+VGRF.

    CONCLUSIONS: This study indicates that test methodology with a simple single linear position transducer setup and or force platform suffice when recording vertical jump such as loaded squat jump.

  • 2.
    Carlsson, Magnus
    et al.
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science.
    Isberg, Jenny
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science.
    Nilsson, Johnny
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science.
    Carlsson, Tomas
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science.
    The acute effects of a short technique-intense training period on side-foot kick performance among elite female soccer players2019In: Journal of Sports Medicine and Physical Fitness, ISSN 0022-4707, E-ISSN 1827-1928, Vol. 59, no 9, p. 1442-1449Article in journal (Refereed)
    Abstract [en]

    BACKGROUND: Previously, it was shown that elite soccer teams were 24% more likely to win matches if their passing effectiveness were increased by 1%. However, research interventions aiming to improve passing performance are scarce. The current study aimed to investigate the effect of a short technique-intense training period on side-foot kick performance among elite female soccer players.

    METHODS: Four side-foot kick tests were completed before and after a training period: kicking a stationary ball using match-relevant (SBRS) and maximal ball speed (SBMS), passing the ball on the move using match-relevant ball speed (RBRS), and repeated side-foot kicks onto a rebound-box with continuously increasing passing distance (RRB). The players were assigned to either the intervention group or the control group. The training intervention consisted of six 55-min training sessions with five side-foot kick exercises. Within-group and between-group differences were investigated using paired-samples t-test and Mann-Whitney U test, respectively.

    RESULTS: The intervention group improved the performance in the RBRS and RRB tests (both P < 0.05), but no differences were found for the SBRS and SBMS tests (both P > 0.05). No improvements were found for the control group independent of test condition (all P > 0.05). Significant between-group differences were found for the RBRS and RRB tests (both P < 0.05), whereas no differences were found for the SBRS and SBMS tests (both P > 0.05).

    CONCLUSIONS: The fundamental soccer skill of passing a moving ball was improved in elite female soccer players by a short technique-intense training period.

  • 3.
    Carlsson, Magnus
    et al.
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science.
    Isberg, Jenny
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science.
    Nilsson, Johnny
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science.
    Carlsson, Tomas
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science.
    The effect of training on side foot-kick performance among swedish first league women´s soccer players2018Conference paper (Refereed)
    Abstract [en]

    THE EFFECT OF TRAINING ON SIDE FOOT-KICK PERFORMANCE AMONG SWEDISH FIRST LEAGUE WOMEN’S SOCCER PLAYERS

    Carlsson, M.1, Isberg, J.1, Nilsson, J.1, Carlsson, T.1 1: Dalarna University (Falun, Sweden)

    Introduction

    A high completion rate for passes is important for success in soccer, because longer passing sequences are related to more scored goals (Hughes & Franks, 2005). In a recent study, it was found that female players had a lower pass-completion rate than male players at the highest competitive standard of European soccer, which suggests that elite female players in general do not have the same technical characteristics as elite male players (Paul S. Bradley et al., 2014). The purpose of the study was investigate the effect of a 2-week training intervention on side foot-kick performance among Swedish first league women’s soccer players.

     Methods

    To investigate the effect of training on side foot-kick performance, a pre-post-intervention study was implemented where four side foot-kick tests were performed before and after a 2-week training period. The side foot-kick accuracy were investigated when kicking a stationary ball using match-relevant ball speed (SBRS) and maximal ball speed (SBMS) as well as subsequent to a 5-m run with the ball from different approach angles (0°, 30°, and 60°) to a predetermined position, where passing of the ball on the move was executed using match-relevant ball speed (RBRS). The fourth test comprised repeated side-foot kicks onto a rebound-box with continuously increasing passing distance (RRB).

    Based on the results from the pre-tests, the players were assigned to either the intervention group (INT) or the control group (CON). The training intervention consisted of six 55-min training sessions. In each session, two rounds of five exercises focusing on improvement of side foot-kick accuracy were executed. Within-group and between-group differences were investigated using paired samples Student’s t-tests and Mann-Whitney U tests, respectively.

    Results

    Prior to the training intervention, there were no significant differences between the groups for any of the investigated test variables. The INT group improved RBRS (P = 0.036) and RRB (P = 0.010) during the training intervention, whereas no significant within-group changes were found for either SBRS or SBMS (both P > 0.05). No within-group differences were found for any of the test variables in the CON group (all P > 0.05). Significant between-group differences were found for RBRS (P = 0.040) and RRB (P = 0.005), whereas no differences were found for either SBRS or SBMS (both P > 0.05).

    Conclusion

    The fundamental soccer skill of passing a moving ball could be improved in elite women players by a 2-week training period focusing on improving   side foot-kick performance.

    References

    Bradley PS, Carling C, Diaz AG, Hood P, Barnes C, Ade J, Boddy M, Krustrup P, Mohr M (2013) Hum Mov Sci, 32, 808-821.

    Hughes M, Franks I (2005) J Sports Sci, 23, 509-514.

  • 4.
    Carlsson, Magnus
    et al.
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science.
    Nilsson, Johnny
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science.
    Hellström, John
    Svenska Golfförbundet.
    Tinmark, Fredrik
    Gymnastik och idrottshögskolan.
    Carlsson, Tomas
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science.
    The effect of ball temperature on ball speed and carry distance in golf drives2019In: Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology, ISSN 1754-3371, Vol. 233, no 2, p. 186-192Article in journal (Refereed)
    Abstract [en]

    The purpose of this study was to investigate the effect of ball temperature on impact ball speed and carry distance during golf drives in a blind randomized test design. The balls were exposed to a temperature-controlled environment (4 °C, 18 °C, 32 °C, and 46 °C) for 24 h prior to the test and each temperature group consisted of 30 balls. The 120 drives were performed by an elite male golfer (handicap: 0.0) in an indoor driving range. All drives were measured by a Doppler-radar system to determine the club-head speed, launch angle, spin rate, ball speed, and carry distance. Differences between the groups were investigated using a one-way analysis of variance. The results indicated that ball-speed and carry-distance differences occurred within the four groups (p < 0.001 and p < 0.01, respectively). The post hoc analyses showed that the ball temperatures of 18 °C and 32 °C had greater ball speeds and carry distances than balls at 4 °C and 46 °C (all p < 0.05). The intervals for the between-group differences were 0.6–0.7 m s−1 and 2.9–3.9 m for ball speed and carry distance, respectively. Hence, the results showed that ball temperature influences both the ball speed and the carry distance. Based on the findings in this study, standardization of ball temperature should be factored into governing body regulation tests for golf equipment.

  • 5.
    Carlsson, Tomas
    et al.
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science.
    Isberg, Jenny
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science.
    Nilsson, Johnny
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science.
    Carlsson, Magnus
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science.
    The influence of task conditions on side foot-kick accuracy among swedish first league women’s soccer players2018In: Journal of Sports Science and Medicine (JSSM), ISSN 1303-2968, Vol. 17, no 1, p. 74-81Article in journal (Refereed)
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  • 6.
    Carlsson, Tomas
    et al.
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science.
    Nilsson, Johnny
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science. Gymnastik och idrottshögskolan, Stockholm.
    Hellström, John
    Svenska golfförbundet, Stockholm.
    Tinmark, Fredrik
    Gymnastik och idrottshögskolan, Stockholm.
    Carlsson, Magnus
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science.
    The effect of ball temperature on ball speed and carry distance in golf drives2018Conference paper (Refereed)
    Abstract [en]

    THE EFFECT OF BALL TEMPERATURE ON BALL SPEED AND CARRY DISTANCE IN GOLF DRIVES

    Carlsson, T.1, Nilsson, J.1,2, Hellström, J.3, Tinmark, F.2, Carlsson, M.1. 1: Dalarna University (Falun, Sweden), 2: The Swedish School of Sport and Health Sciences (Stockholm, Sweden), 3: The Swedish Golf Federation (Stockholm, Sweden). 

    Introduction

    Previously it was reported that golf-ball temperature has influence on the golf balls’ coefficient of restitution, impact duration, and maximal deformation (Allen et al., 2012). They concluded that their research was the first step in a process for determining the effect of temperature on a golf drive. However, how large influence the golf-ball temperature has on golf drives remains to be investigated. The purpose was to investigate the effect of ball temperature on impact ball speed and carry distance during golf drives in a blind randomized test design. 

    Methods

    The balls were exposed to a temperature-controlled environment (4°C, 18°C, 32°C, and 46°C) for twenty-four hours prior to the test, and each of the four different ball-temperature groups consisted of 30 balls. The 120 drives were performed by an elite male golfer (handicap: 0.0) in an indoor driving range. All drives were measured by a Doppler-radar system to determine club-head speed, launch angle, spin rate, ball speed, and carry distance. Differences between the four ball-temperature groups were investigate using a one-way analysis of variance. 

    Results

    The results indicate that there are ball-speed and carry-distance differences within the four ball-temperature groups (P < 0.001 and P < 0.01, respectively). The post-hoc analyses showed that the ball temperatures 18°C and 32°C had both greater ball speeds and carry distances compared to the balls in the ball-temperature groups 4°C and 46°C (all P < 0.05); the intervals for the between-group differences were 2.0 to 2.4 km/h and 2.9 to 3.9 m for ball speed and carry distance, respectively.

    Conclusion

    The novel results of the current study show that the ball’s temperature has a significant effect on the ball speed after club-head impact and carry distance for drives performed by an elite golfer. The ball temperatures 18°C and 32°C gave significantly increased ball speeds and carry distances compared to the ball-temperature groups 4°C and 46°C. This knowledge could be used to maximise the carry distance and/or to minimise the carry-distance variability related to ball temperature.

    REFERENCES:

    Allen T, Bowley A, Wood P, Henrikson E, Morales E, James D. (2012) Procedia Eng, 34, 634-639.

  • 7.
    Carlsson, Tomas
    et al.
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science.
    Wedholm, Lars
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science.
    Nilsson, Johnny
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science.
    Carlsson, Magnus
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science.
    The effects of strength training versus ski-ergometer training on double-poling capacity of elite junior cross-country skiers2017In: European Journal of Applied Physiology, ISSN 1439-6319, E-ISSN 1439-6327, Vol. 117, no 8, p. 1523-1532Article in journal (Refereed)
    Abstract [en]

    Purpose

    To compare the effects of strength training versus ski-ergometer training on double-poling gross efficiency (GE), maximal speed (Vmax), peak oxygen uptake (V&#x02D9;O2peak" role="presentation" style="box-sizing: border-box; display: inline-table; line-height: normal; letter-spacing: normal; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">V˙O2peakV˙O2peak) for elite male and female junior cross-country skiers.

    Methods

    Thirty-three elite junior cross-country skiers completed a 6-week training-intervention period with two additional 40-min training sessions per week. The participants were matched in pairs and within each pair randomly assigned to either a strength-training group (STR) or a ski-ergometer-training group (ERG). Before and after the intervention, the participants completed three treadmill roller-skiing tests to determine GE, Vmax, and V&#x02D9;O2peak" role="presentation" style="box-sizing: border-box; display: inline-table; line-height: normal; letter-spacing: normal; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">V˙O2peakV˙O2peak. Mixed between-within subjects analysis of variance (ANOVA) was conducted to evaluate differences between and within groups. Paired samples t tests were used as post hoc tests to investigate within-group differences.

    Results

    Both groups improved their Vmax and V&#x02D9;O2peak" role="presentation" style="box-sizing: border-box; display: inline-table; line-height: normal; letter-spacing: normal; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">V˙O2peakV˙O2peak expressed absolutely (all P < 0.01). For the gender-specific sub-groups, it was found that the female skiers in both groups improved both Vmax and V&#x02D9;O2peak" role="presentation" style="box-sizing: border-box; display: inline-table; line-height: normal; letter-spacing: normal; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">V˙O2peakV˙O2peak expressed absolutely (all P < 0.05), whereas the only within-group differences found for the men were improvements of Vmax in the STR group. No between-group differences were found for any of the investigated variables.

    Conclusions

    Physiological and performance-related variables of importance for skiers were improved for both training regimes. The results demonstrate that the female skiers’ physiological adaptations to training, in general, were greater than those of the men. The magnitude of the physiological adaptations was similar for both training regimes.

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  • 8.
    Isberg, Jenny
    et al.
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science.
    Carlsson, Magnus
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science.
    Nilsson, Johnny
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science.
    Carlsson, Tomas
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science.
    Effekten av en träningsintervention avseende kvinnliga elitfotbollsspelares bredsidespassningsprecision och deras uppfattning om sin tekniska färdighet2018Conference paper (Refereed)
  • 9.
    Nilsson, Johnny
    et al.
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science. 2The Swedish School of Sport and Health Sciences, Stockholm.
    Cardinale, Daniele
    Aerobic and anaerobic test performance among elite male football players in different team positions2015In: LASE Journal of Sport Science, ISSN 1691-7669, E-ISSN 1691-9912, Vol. 6, no 2, p. 73-92Article in journal (Refereed)
    Abstract [en]

    The purpose was to determine the magnitude of aerobic and anaerobic performance factors among elite male football players in different team positions. Thirty-nine players from the highest Swedish division classified as defenders (n=18), midfield players (n=12) or attackers (n=9) participated. Their mean (± sd) age, height and body mass (bm) were 24.4 (±4.7) years, 1.80 (±5.9)m and 79 (±7.6)kg, respectively. Running economy (RE) and anaerobic threshold (AT) was determined at 10, 12, 14, and 16km/h followed by tests of maximal oxygen uptake (VO2max). Maximal strength (1RM) and average power output (AP) was performed in squat lifting. Squat jump (SJ), counter-movement jump with free arm swing (CMJa), 45m maximal sprint and the Wingate test was performed. Average VO2max for the whole population (WP) was 57.0mL O2•kg-1min-1 . The average AT occurred at about 84% of VO2max. 1RM per kg bm0.67 was 11.9±1.3kg. Average squat power in the whole population at 40% 1RM was 70±9.5W per kg bm0.67 . SJ and CMJa were 38.6±3.8cm and 48.9±4.4cm, respectively. The average sprint time (45m) was 5.78± 0.16s. The AP in the Wingate test was 10.6±0.9W•kg-1 . The average maximal oxygen uptake among players in the highest Swedish division was lower compared to international elite players but the Swedish players were better off concerning the anaerobic threshold and in the anaerobic tests. No significant differences were revealed between defenders, midfielders or attackers concerning the tested parameters presented above.

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  • 10.
    Nilsson, Johnny
    et al.
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science. The Swedish School of Sport and Health Sciences, Stockholm.
    Cardinale, Daniele
    Running economy and blood lactate accumulation in elite football players with high and low maximal aerobic power2015In: LASE Journal of Sport Science, ISSN 1691-7669, E-ISSN 1691-9912, Vol. 6, no 2, p. 44-51Article in journal (Refereed)
    Abstract [en]

    The purpose was to determine running economy and lactate threshold among a selection of male elite football players with high and low aerobic power. Forty male elite football players from the highest Swedish division (“Allsvenskan”) participated in the study. In a test of running economy (RE) and blood lactate accumulation the participants ran four minutes each at 10, 12, 14, and 16 km•h-1 at horizontal level with one minute rest in between each four minutes interval. After the last sub-maximal speed level the participants got two minutes of rest before test of maximal oxygen uptake (VO2max). Players that had a maximal oxygen uptake lower than the average for the total population of 57.0 mL O2•kg-1•minute-1 were assigned to the low aerobic power group (LAP) (n=17). The players that had a VO2max equal to or higher than 57.0 mL O2•kg-1•minute-1 were selected for the high aerobic power group (HAP) (n=23). The VO2max was significantly different between the HAP and LAP group. The average RE, measured as oxygen uptake at 12, 14 and 16km•h-1 was significantly lower but the blood lactate concentration was significantly higher at 14 and 16 km•h-1 for theLAP group compared with the HAP group.

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  • 11.
    Nilsson, Johnny
    et al.
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science. Gymnastik- och idrottshögskolan, Stockholm.
    Fredriksson, Mårten
    Gymnastik- och idrottshögskolan, Stockholm.
    Peak oxygen uptake and muscle power can be simultaneously improved with hybrid training2015In: LASE Journal of Sport Science, ISSN 1691-7669, E-ISSN 1691-9912, Vol. 6, no 1, p. 3-15Article in journal (Refereed)
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  • 12. Quennerstedt, Mikael
    et al.
    Gibbs, Beatrice
    Almqvist, Jonas
    Nilsson, Johnny
    Dalarna University, School of Education, Health and Social Studies, Sport and Health Science.
    Winther, Helle
    Beatrice: Dance video games as a resource for teaching dance2017In: Digital technologies and learning in physical education: Pedagogical cases / [ed] Ashley Casey, Victoria a. Goodyear & Kathleen M. Armour, New York: Routledge, 2017, 1, p. 69-85Chapter in book (Other academic)
  • 13.
    Rosen, Johanna S
    et al.
    Department of Physiology, Nutrition and Biomechanics, the Swedish School of Sport and Health Sciences (GIH), Stockholm, Sweden.
    Arndt, Anton
    Department of Physiology, Nutrition and Biomechanics, the Swedish School of Sport and Health Sciences (GIH), Stockholm, Sweden; Department of Clinical Sciences, Intervention and Technology (CLINTEC), Karolinska Institute, Stockholm, Sweden.
    Nilsson, Johnny
    Dalarna University, School of Health and Welfare, Sport and Health Science. Department of Physiology, Nutrition and Biomechanics, the Swedish School of Sport and Health Sciences (GIH), Stockholm, Sweden.
    Rosdahl, Hans
    Department of Physiology, Nutrition and Biomechanics, the Swedish School of Sport and Health Sciences (GIH), Stockholm, Sweden.
    Goosey-Tolfrey, Victoria L
    Peter Harrison Centre for Disability Sport, School of Sport, Exercise and Health Sciences, Loughborough University, Loughborough, UK.
    Bjerkefors, Anna
    Department of Physiology, Nutrition and Biomechanics, the Swedish School of Sport and Health Sciences (GIH), Stockholm, Sweden; Department of Neuroscience, Karolinska Institute, Stockholm, Sweden.
    Kinematic and kinetic performance variables during paddling among para-kayak athletes with unilateral above or below knee amputation2022In: Sports Biomechanics, ISSN 1476-3141, E-ISSN 1752-6116Article in journal (Refereed)
    Abstract [en]

    In para-kayak, athletes with unilateral above knee amputation (AK) and athletes with below knee amputation (BK) compete in the same class. This has been questioned since previous research have shown that the legs are important for paddling performance. The purpose was therefore to examine differences in kinematic and kinetic performance variables between AK and BK para-kayak athletes and the amputated (A) and non-amputated (NA) sides. Eleven AK and six BK athletes on international level participated. 3D kinematic and kinetic data were collected for the body, seat, footrest and paddle during kayak ergometer paddling. There were no significant differences between the groups in main performance variables such as power output or paddle force. Differences between the groups were only seen in the hip joint in flexion range of motion, flexion and extension angular velocity and flexion moment where BK demonstrated larger values. The NA side demonstrated greater values compared to the A side in posterior force at the seat and in hip flexion moment. As there were no significant differences between the groups in the majority of the examined key performance variables, the results suggest that athletes with unilateral AK and BK amputation may be able to compete in the same class.

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