umu.sePublications
Change search
Link to record
Permanent link

Direct link
BETA
Publications (10 of 20) Show all publications
Gilenstam, K. & Geithner, C. (2019). Body Composition of Women’s Ice Hockey Players: Comparison of Estimates Using Skinfolds and iDXA. Journal of Strength and Conditioning Research, 33(9), 2496-2502
Open this publication in new window or tab >>Body Composition of Women’s Ice Hockey Players: Comparison of Estimates Using Skinfolds and iDXA
2019 (English)In: Journal of Strength and Conditioning Research, ISSN 1064-8011, E-ISSN 1533-4287, Vol. 33, no 9, p. 2496-2502Article in journal (Refereed) Published
Abstract [en]

The purpose of this study was to compare percent fat (% Fat) estimates from anthropometric equations using skinfolds (SKF) in women’s ice hockey players to estimates obtained from Lunar iDXA. Data were collected on 19 elite female Swedish hockey players (mean age ± SD = 18.4 ± 2.4 y). Four skinfolds (SKF) (triceps, abdominal, suprailiac, and thigh) were measured within two hours of iDXA assessments. The % Fat estimates from iDXA and four anthropometric equations were compared using paired t-tests, and a one-way ANOVA was used to compare % Fat estimates from the anthropometric equations. Bland Altman analyses were used to assess agreement between % Fat estimates from SKF and iDXA. The significance level was set a priori at p<0.05. The % Fat estimates from anthropometric equations were significantly lower than those from iDXA (mean ± SD: 26.85 ± 4.93%,p=0.000). Bland Altman analyses indicated mean differences of -7.96 to -10.13 percentage points between anthropometric equations and iDXA. Estimates of % Fat from anthropometric equations (range: 16.72% to 18.89%) were within the range reported in earlier studies using the Sum of 7 SKF. Thus, SKF offer a reasonable alternative to iDXA for this population, but result in underestimates of % Fat relative to iDXA. Strength and conditioning coaches should use the same body composition assessment method consistently, and interpret the results with caution, as they are estimates and not true values.

Place, publisher, year, edition, pages
Wolters Kluwer, 2019
Keywords
women’s ice hockey, female athletes, relative fatness, skinfolds, DXA
National Category
Sport and Fitness Sciences Other Medical Sciences not elsewhere specified
Identifiers
urn:nbn:se:umu:diva-148368 (URN)10.1519/JSC.0000000000002400 (DOI)29239987 (PubMedID)
Available from: 2018-06-04 Created: 2018-06-04 Last updated: 2019-10-14Bibliographically approved
Bengtsson, V., Yu, J.-G. & Gilenstam, K. (2018). Could the negative effects of static stretching in warm-up be restored by sport specific exercise?. Journal of Sports Medicine and Physical Fitness, 58(9), 1185-1189
Open this publication in new window or tab >>Could the negative effects of static stretching in warm-up be restored by sport specific exercise?
2018 (English)In: Journal of Sports Medicine and Physical Fitness, ISSN 0022-4707, E-ISSN 1827-1928, ISSN 0022-4707, Vol. 58, no 9, p. 1185-1189Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: Static stretching (SS) is widely used in warm-up as it is generally believed to increase mobility and reduce the risk of injury; however, SS has been shown to induce transient negative effects on subsequent muscle performance. Interestingly, recent studies have shown that sport specific exercise could restore SS-induced negative effects on certain sports, especially of explosive muscular performance. Whether sport specific exercise could restore SS-induced negative effects on isokinetic muscle performance remains unclear.

METHODS: The present study conducted two different warm-ups: 2-component warm-up and 3-component warm-up on 15 university students. Both protocols contained low intensity aerobic exercise and sport specific exercise, whereas the 3-component warm-up also contained SS which has been previously proven to induce negative effects on subsequent muscle performance. After the warm-ups, the subjects performed an isokinetic test on a Biodex. To make the sport specific exercise mimic the subsequent test, both included concentric isokinetic knee extension. During the tests, muscle performance of peak torque, mean power, and total work was recorded. Comparison of the measurements on each parameter between the two warm-ups was performed using paired t test.

RESULTS: The comparisons did not reveal any significant difference in the measurement of any parameter between the two different warm-up protocols, and calculation of Cohen's revealed small effect sizes on all of the three variables.

CONCLUSIONS: On basis of the present results and that the SS could induce transient negative effects on subsequent muscle performance, we concluded that the negative effects of the SS on the variables were restored by the isokinetic contractions.

Place, publisher, year, edition, pages
Edizioni Minerva Medica, 2018
Keywords
warm-up, static stretching, transient negative effect, sport specific exercise, restore effects
National Category
Sport and Fitness Sciences
Research subject
Physiology
Identifiers
urn:nbn:se:umu:diva-134043 (URN)10.23736/S0022-4707.17.07101-8 (DOI)000445212900001 ()28409517 (PubMedID)
Available from: 2017-04-25 Created: 2017-04-25 Last updated: 2018-12-13Bibliographically approved
Strömbäck, E., Aasa, U., Gilenstam, K. & Berglund, L. (2018). Prevalence and consequences of injuries in powerlifting: a cross-sectional study. The Orthopaedic Journal of Sports Medicine, 6(5), Article ID 2325967118771016.
Open this publication in new window or tab >>Prevalence and consequences of injuries in powerlifting: a cross-sectional study
2018 (English)In: The Orthopaedic Journal of Sports Medicine, ISSN 2325-9671, Vol. 6, no 5, article id 2325967118771016Article in journal (Refereed) Published
Abstract [en]

Background: Powerlifting consists of the squat, bench press, and dead lift, and extreme loads are lifted during training and competitions. Previous studies, which have defined an injury as an event that causes an interruption in training or competitions, have reported a relatively low frequency of powerlifting injuries (1.0-4.4 injuries/1000 hours of training). No previous study has investigated the prevalence of injuries, defined as a condition of pain or impairment of bodily function that affects powerlifters’ training, in a balanced sample of men and women, and no studies have established possible risk factors for an injury.

Purpose: To investigate the prevalence, localization, and characterization of injuries among Swedish subelite classic powerlifters, with an emphasis on differences between men and women, and to investigate whether training and lifestyle factors are associated with an injury.

Study Design: Cross-sectional study; Level of evidence, 3.

Methods: A total of 53 female and 51 male Swedish subelite powerlifters answered an online questionnaire including questions about background characteristics, training habits, and lifestyle factors. The main part of the questionnaire included questions about injuries and their consequences. An injury was defined as a condition of pain or impairment of bodily function that affects powerlifters’ training.

Results: Seventy percent (73/104) of participants were currently injured, and 87% (83/95) had experienced an injury within the past 12 months. The lumbopelvic region, shoulder, and hip were the most commonly injured areas for both sexes. Women experienced a significantly greater frequency of injuries in the neck and thoracic region than men. Injuries seemed to occur during training, although only 16% (11/70) of those currently injured had to completely refrain from training. Training frequency, greater personal best in the dead lift, injury onset during bench-press and dead-lift training, use of straps, alcohol consumption, and dietary issues were associated with current injuries.

Conclusion: Injuries are very common in subelite powerlifters. Men and women report similar injury frequencies but different anatomic locations. These injuries do not prevent powerlifters from training and competing, but they may change the content of training sessions. Why powerlifters develop injuries is still unclear; however, it is likely that the management of training loads and optimization of the lifting technique during the squat, bench press, and dead lift are of importance.

Place, publisher, year, edition, pages
Thousand Oaks, California: Sage Publications, 2018
Keywords
sports injury, risk factors, resistance training, low back pain
National Category
Physiotherapy Sport and Fitness Sciences Other Medical Sciences not elsewhere specified
Research subject
physiotherapy; biomechanics
Identifiers
urn:nbn:se:umu:diva-147734 (URN)10.1177/2325967118771016 (DOI)000432239400001 ()
Available from: 2018-05-16 Created: 2018-05-16 Last updated: 2018-06-13Bibliographically approved
Geithner, C. A., Molenaar, C. E., Henriksson, T., Fjellman-Wiklund, A. & Gilenstam, K. (2018). Relative Age Effects in Women’s Ice Hockey: Contributions of Body Size and Maturity Status. Women in Sport & Physical Activity Journal, 26(2), 124-133
Open this publication in new window or tab >>Relative Age Effects in Women’s Ice Hockey: Contributions of Body Size and Maturity Status
Show others...
2018 (English)In: Women in Sport & Physical Activity Journal, ISSN 1063-6161, E-ISSN 1938-1581, Vol. 26, no 2, p. 124-133Article in journal (Refereed) Published
Abstract [en]

Research on relative age effects (RAEs) in women’s ice hockey is lacking data on participant characteristics, particularly body size and maturity status. The purposes of our study were to investigate RAEs in women’s ice hockey players from two countries, and to determine whether RAE patterns could be explained by chronological age, body size, and maturity status. Participants were 54 Swedish elite and 63 Canadian university players. Birthdates were coded by quartiles (Q1–Q4). Weight and height were obtained, and body mass index and chronological age were calculated for each player. Players recalled age at menarche, and maturity status was classified as early, average, or late relative to population-specific means. Chi-square (χ2), odds ratios (OR), 95% confidence intervals (CI) and effect sizes (Cohen’s w) were calculated using population data across quartiles and for pairwise comparisons between quartiles. Descriptive statistics and MANOVAs were run by quartile and by country. Significant RAEs were found for Canadian players across quartiles (p < .05), along with a Q2 phenomenon (Q2: Q3, Q2: Q4, p < .05). Swedish players were overrepresented in Q3 (Q3: Q4, p < .05). Q4 was significantly underrepresented in both countries (p < .05). The oldest, earliest maturing, and shortest players in both countries were clustered in Q2, whereas the next oldest and latest maturing Swedish players were found in Q3. Age, physical factors, and interactions may contribute to overrepresentations in Q2 and Q3. These findings do not suggest the same bias for greater relative age and maturity found in male ice hockey.

Keywords
birth distribution, female ice hockey, height, maturation, weight
National Category
Physiology
Research subject
Physiology
Identifiers
urn:nbn:se:umu:diva-142865 (URN)10.1123/wspaj.2017-0034 (DOI)
Funder
The Kempe Foundations
Note

Originally included in thesis in manuscript form with the title "Relative age effects in women's ice hockey: international comparisons".

Available from: 2017-12-12 Created: 2017-12-12 Last updated: 2018-12-14Bibliographically approved
Henriksson, T. & Gilenstam, K. (2017). Fysiska tester inom damishockey och dess relevans för prestation. Idrottsmedicin, 36(1), 20-22
Open this publication in new window or tab >>Fysiska tester inom damishockey och dess relevans för prestation
2017 (Swedish)In: Idrottsmedicin, ISSN 1103-7652, Vol. 36, no 1, p. 20-22Article in journal (Other (popular science, discussion, etc.)) Published
Place, publisher, year, edition, pages
Västerås: Edita Västra Aros AB, 2017
Keywords
idrottsmedicin idrottsfysiologi prestation ishockey damhockey
National Category
Sport and Fitness Sciences
Research subject
Medicine; Physiology
Identifiers
urn:nbn:se:umu:diva-132104 (URN)
Available from: 2017-03-03 Created: 2017-03-03 Last updated: 2018-06-09
Henriksson, T., Vescovi, J. D., Fjellman-Wiklund, A. & Gilenstam, K. (2016). Laboratory- and field-based testing as predictors of skating performance in competetive-level female ice hockey. Open Access Journal of Sports Medicine, 7, 81-88
Open this publication in new window or tab >>Laboratory- and field-based testing as predictors of skating performance in competetive-level female ice hockey
2016 (English)In: Open Access Journal of Sports Medicine, ISSN 1179-1543, E-ISSN 1179-1543, Vol. 7, p. 81-88Article in journal (Refereed) Published
Abstract [en]

OBJECTIVES: The purpose of this study was to examine whether field-based and/or laboratory-based assessments are valid tools for predicting key performance characteristics of skating in competitive-level female hockey players.

DESIGN: Cross-sectional study.

METHODS: Twenty-three female ice hockey players aged 15-25 years (body mass: 66.1±6.3 kg; height: 169.5±5.5 cm), with 10.6±3.2 years playing experience volunteered to participate in the study. The field-based assessments included 20 m sprint, squat jump, countermovement jump, 30-second repeated jump test, standing long jump, single-leg standing long jump, 20 m shuttle run test, isometric leg pull, one-repetition maximum bench press, and one-repetition maximum squats. The laboratory-based assessments included body composition (dual energy X-ray absorptiometry), maximal aerobic power, and isokinetic strength (Biodex). The on-ice tests included agility cornering s-turn, cone agility skate, transition agility skate, and modified repeat skate sprint. Data were analyzed using stepwise multivariate linear regression analysis. Linear regression analysis was used to establish the relationship between key performance characteristics of skating and the predictor variables.

RESULTS: Regression models (adj R2) for the on-ice variables ranged from 0.244 to 0.663 for the field-based assessments and from 0.136 to 0.420 for the laboratory-based assessments. Single-leg tests were the strongest predictors for key performance characteristics of skating. Single leg standing long jump alone explained 57.1%, 38.1%, and 29.1% of the variance in skating time during transition agility skate, agility cornering s-turn, and modified repeat skate sprint, respectively. Isokinetic peak torque in the quadriceps at 90° explained 42.0% and 32.2% of the variance in skating time during agility cornering s-turn and modified repeat skate sprint, respectively.

CONCLUSION: Field-based assessments, particularly single-leg tests, are an adequate substitute to more expensive and time-consuming laboratory assessments if the purpose is to gain knowledge about key performance characteristics of skating.

Keywords
exercise physiology, physiological characteristics, sport, test methodology
National Category
Sport and Fitness Sciences
Research subject
Physiology
Identifiers
urn:nbn:se:umu:diva-129435 (URN)10.2147/OAJSM.S109124 (DOI)000399933700002 ()27574474 (PubMedID)
Available from: 2016-12-28 Created: 2016-12-28 Last updated: 2018-06-09Bibliographically approved
Henriksson, T., Fjellman-Wiklund, A. & Gilenstam, K. (2015). Correlation between Off-ice Strength and Power Variables and Skating Performance in Women's Ice Hockey. Paper presented at American College of Sports Medicine (ACSM) Annual Meeting, San Diego, CA, May 2015. Medicine & Science in Sports & Exercise, 47(5S), 962-962
Open this publication in new window or tab >>Correlation between Off-ice Strength and Power Variables and Skating Performance in Women's Ice Hockey
2015 (English)In: Medicine & Science in Sports & Exercise, ISSN 0195-9131, E-ISSN 1530-0315, Vol. 47, no 5S, p. 962-962Article in journal, Meeting abstract (Refereed) Published
Abstract [en]

The relationship between off-ice tests and skating performance has not been previously investigated in elite women ice hockey players (WIHP).

PURPOSE: The aim of this study was to investigate the relationship between off-ice strength-, and power- variables and different components of skating performance in Elite WIHP. 

METHODS: Elite WIHP (n=32) age: 18.3±2.1 years, were evaluated via physiological tests of; Vertical power (squat jump (SJ) and countermovement jump (CMJ)); Horizontal power (standing long jump on two legs (SLJ) on one leg (SLJR) and 20m linear sprinting); Strength (isometric leg pull, squat and isokinetic leg extension on 90° and 210° (Iso90, Iso210)). Right leg measurements were selected for the isokinetic leg extension and SLJ(R). Skating performance was assessed on-ice via three agility tests; S-cornering agility skate (SCAS), Transition agility skate (TAS), Cone agility skate (CAS), and anaerobic endurance test; Modified repeat sprint skate (MRSS). Pearson ́s bivariate correlations were used to investigate the associations between physical variables and on-ice variables. Statistical significance was set to p<.05.

RESULTS: SLJR, SLJ, Iso90, Iso210, isometric leg-pull and 20m sprint were correlated with TAS, r = .698 (p.001), r = .509 (p.026), r = -.514 (p.050), r = -.529 (p.043), -.479 (p.038) and r = .631 (p.007) respectively. SLJR and Iso90 was correlated with SCAS, r = -.619 (p.005) and r = -.520 (p.047). SLJR, SLJ, CMJ and Iso210 were correlated to MRSS, r = -.588 (p.01), r = -.539 (p.021), r = -.482 (p.037) and r = -.544 (p.04) respectively. CAS was not significantly correlated with any of the physiological tests.

CONCLUSIONS: Off-ice power and strength tests were significantly correlated to skating performance in elite WIHP. 

Place, publisher, year, edition, pages
Wolters Kluwer, 2015
Keywords
sports medicine, sports physiology, sports specific tests, sports performance, women's sport
National Category
Sport and Fitness Sciences
Research subject
Medicine; Sports Medicine; Sports Medicine
Identifiers
urn:nbn:se:umu:diva-129595 (URN)10.1249/01.mss.0000479351.55212.63 (DOI)
Conference
American College of Sports Medicine (ACSM) Annual Meeting, San Diego, CA, May 2015
Available from: 2017-01-03 Created: 2017-01-03 Last updated: 2019-03-01Bibliographically approved
Molenaar, C. E., Geithner, C. A., Henriksson, T., Fjellman-Wiklund, A. & Gilenstam, K. (2015). The Relative Age Effect in Women's Ice Hockey: International and Positional Comparison. Medicine & Science in Sports & Exercise, 47(5S), 629-630
Open this publication in new window or tab >>The Relative Age Effect in Women's Ice Hockey: International and Positional Comparison
Show others...
2015 (English)In: Medicine & Science in Sports & Exercise, ISSN 0195-9131, E-ISSN 1530-0315, Vol. 47, no 5S, p. 629-630Article in journal, Meeting abstract (Other academic) Published
Abstract [en]

A relative age effect (RAE), or chronological age differences among individuals within the same age group, has been observed in 14 sports (Cobley et al., 2009). A strong RAE has been reported in men’s ice hockey since 1985 (Barnsley et al., 1985). In contrast, research on RAE in women’s ice hockey is limited (Wattie et al., 2007; Weir et al., 2010) and findings are equivocal.PURPOSE: To determine whether there is a RAE in women’s ice hockey, and if it varies by country or player position.

METHODS: Participants were 117 female ice hockey players (mean age=19.9±2.3 yr) on 2 Swedish elite-level club teams (n=54) and 4 Canadian university teams (n=63). Players reported birthdate and position (Forward=F, Defenseman=D, Goalie=G). Birthdates were coded by quartiles (Q1: Jan.-March, Q2: April-June, Q3: July-Sept., Q4: Oct.-Dec.) and by half-year. Birthdate data were submitted to chi-square analyses for the sample, by country, and by position. SPSS 17.0 for Windows was used for all analyses (significance level: p<0.05). RESULTS: A significant RAE was observed for the entire sample by quartile (Q1: 28.2%, Q2: 34.2%, Q3: 25.6%, Q4: 12.0%; χ2=12.402, p=0.006). More players were born in the first half of the year than the second (62.4% vs. 37.6%, respectively; χ2=7.188, p=0.007). In contrast, Q4 was underrepresented for the sample and by country (Canada: 12.7%, Sweden: 11.1%). A RAE was present for the Canadian players by quartile (χ2=13.381, p=0.004) and half-year (χ2=9.921, p=0.002); however, no RAE was observed for Swedish players. In addition, a significant RAE was observed for the entire sample by position for G and D by quartiles (G - χ2=10.077, p=0.018; D - χ2=8.444, p=0.038) and half year (G - χ2=6.231, p=0.013; D - χ2=4.000, p=0.046), but not for F.

CONCLUSIONS: The significant RAE in this sample is consistent with that in men’s ice hockey and the tendency for greater participation by relatively older players in women’s ice hockey. RAE absence in the Swedish players may reflect lower participant number, competitive level, and sociocultural support, as well as greater variation in skill level. The significant RAEs observed in Canadian players and by position support the findings of Weir et al. (2010), but the positional differences found were inconsistent, perhaps due to differences in sample size and competitive level between studies. 

Place, publisher, year, edition, pages
Lippincott Williams & Wilkins, 2015
Keywords
sports medicine, sports physiology, Relative age effect, ice hockey, women's sport, female
National Category
Sport and Fitness Sciences
Research subject
Physiology
Identifiers
urn:nbn:se:umu:diva-129593 (URN)10.1249/01.mss.0000478433.02353.1a (DOI)000415220900236 ()
Note

Supplement: 1

Meeting Abstract: 2350

Available from: 2017-01-03 Created: 2017-01-03 Last updated: 2019-03-21Bibliographically approved
Hammarström, A., Johansson, K., Annandale, E., Ahlgren, C., Aléx, L., Christianson, M., . . . Verdonk, P. (2014). Central gender theoretical concepts in health research: the state of the art. Journal of Epidemiology and Community Health, 68(2), 185-190
Open this publication in new window or tab >>Central gender theoretical concepts in health research: the state of the art
Show others...
2014 (English)In: Journal of Epidemiology and Community Health, ISSN 0143-005X, E-ISSN 1470-2738, Vol. 68, no 2, p. 185-190Article in journal (Refereed) Published
Abstract [en]

Despite increasing awareness of the importance of gender perspectives in health science, there is conceptual confusion regarding the meaning and the use of central gender theoretical concepts. We argue that it is essential to clarify how central concepts are used within gender theory and how to apply them to health research. We identify six gender theoretical concepts as central and interlinked-but problematic and ambiguous in health science: sex, gender, intersectionality, embodiment, gender equity and gender equality. Our recommendations are that: the concepts sex and gender can benefit from a gender relational theoretical approach (ie, a focus on social processes and structures) but with additional attention to the interrelations between sex and gender; intersectionality should go beyond additive analyses to study complex intersections between the major factors which potentially influence health and ensure that gendered power relations and social context are included; we need to be aware of the various meanings given to embodiment, which achieve an integration of gender and health and attend to different levels of analyses to varying degrees; and appreciate that gender equality concerns absence of discrimination between women and men while gender equity focuses on women's and men's health needs, whether similar or different. We conclude that there is a constant need to justify and clarify our use of these concepts in order to advance gender theoretical development. Our analysis is an invitation for dialogue but also a call to make more effective use of the knowledge base which has already developed among gender theorists in health sciences in the manner proposed in this paper.

Place, publisher, year, edition, pages
BMJ Publishing Group Ltd, 2014
Keywords
Gender, public health, social inequalities
National Category
Public Health, Global Health, Social Medicine and Epidemiology
Identifiers
urn:nbn:se:umu:diva-84828 (URN)10.1136/jech-2013-202572 (DOI)000329487900007 ()24265394 (PubMedID)
Funder
Swedish Research Council, 344-2006-7280, 344-2011-5478
Available from: 2014-01-20 Created: 2014-01-20 Last updated: 2018-06-08Bibliographically approved
Henriksson, T., Fjellman-Wiklund, A. & Gilenstam, K. (2013). Running a team is like laying a puzzle: Elite coaches' perspective on women's ice hockey. In: : . Paper presented at 18th Annual Congress of European College of Sport Science, Barcelona, June 26-29, 2013.
Open this publication in new window or tab >>Running a team is like laying a puzzle: Elite coaches' perspective on women's ice hockey
2013 (English)Conference paper, Poster (with or without abstract) (Refereed)
National Category
Physiology Gender Studies
Research subject
gender studies; Physiology
Identifiers
urn:nbn:se:umu:diva-129632 (URN)
Conference
18th Annual Congress of European College of Sport Science, Barcelona, June 26-29, 2013
Available from: 2017-01-05 Created: 2017-01-05 Last updated: 2019-03-01Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-4690-6759

Search in DiVA

Show all publications