Gymnastik- och idrottshögskolan, GIH

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Publications (10 of 17) Show all publications
Petré, H., Ovendal, A., Westblad, N., ten Siethoff, L., Rosdahl, H. & Psilander, N. (2023). Effect of the Intrasession Exercise Order of Flywheel Resistance and High-Intensity Interval Training on Maximal Strength and Power Performance in Elite Team-Sport Athletes.. Journal of Strength and Conditioning Research, 37(12), 2389-2396
Open this publication in new window or tab >>Effect of the Intrasession Exercise Order of Flywheel Resistance and High-Intensity Interval Training on Maximal Strength and Power Performance in Elite Team-Sport Athletes.
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2023 (English)In: Journal of Strength and Conditioning Research, ISSN 1064-8011, E-ISSN 1533-4287, Vol. 37, no 12, p. 2389-2396Article in journal (Refereed) Published
Abstract [en]

This study aimed to investigate the effect of intrasession exercise order of maximal effort flywheel resistance training (RT; 436 repetitions [rep]) and high-intensity interval training (HIIT, 2–438 rep of 20 second at 130% of Watt atV̇O2max [wV̇O2max]), on the development of maximal strength and power in elite team-sport athletes. A 7-week training intervention involving 2 training sessions per week of either HIIT followed by RT (HIIT + RT, n 5 8), RT followed by HIIT (RT + HIIT, n 5 8), or RTalone (RT, n 5 7) was conducted in 23 elite male bandy players (24.7 6 4.3 years). Power and work were continuously measured during the flywheel RT. Isometric squat strength (ISq), countermovement jump, squat jump, and V̇O2max were measured before and after the training period. Power output during training differed between the groups (p 5 0.013, h2p5 0.365) with RT producing more power than HIIT + RT (p 5 0.005). ISq improved following RT + HIIT (;80%, d 5 2.10, p 5 0.001) and following HIIT + RT(;40%, d 5 1.64, p 5 0.005), and RT alone (;70%, d 5 1.67, p 5 0.004). V̇O2max increased following RT + HIIT and HIIT + RT(;10%, d51.98, p50.001 resp. d52.08, p50.001). HIIT before RT reduced power output during RT in elite team-sport athletes but did not lead to blunted development of maximal strength or power after a 7-week training period. During longer training periods(.7-weeks), it may be advantageous to schedule RT before HIIT because the negative effect of HIIT + RT on training quality increased during the final weeks of training. In addition, the largest training effect on maximal strength was observed following RT +HIIT.

Place, publisher, year, edition, pages
Wolters Kluwer, 2023
Keywords
divergent training, interference effect, flywheel training, concurrent training sequence, concurrent training order
National Category
Sport and Fitness Sciences
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-7723 (URN)10.1519/JSC.0000000000004556 (DOI)001110248000003 ()37389921 (PubMedID)
Available from: 2023-08-21 Created: 2023-08-21 Last updated: 2024-01-15
Derakhti, M., Bremec, D., Kambič, T., ten Siethoff, L. & Psilander, N. (2022). Four Weeks of Power Optimized Sprint Training Improves Sprint Performance in Adolescent Soccer Players.. International Journal of Sports Physiology and Performance, 17(9), 1343-1351
Open this publication in new window or tab >>Four Weeks of Power Optimized Sprint Training Improves Sprint Performance in Adolescent Soccer Players.
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2022 (English)In: International Journal of Sports Physiology and Performance, ISSN 1555-0265, E-ISSN 1555-0273, Vol. 17, no 9, p. 1343-1351Article in journal (Refereed) Published
Abstract [en]

PURPOSE: This study compared the effects of heavy resisted sprint training (RST) versus unresisted sprint training (UST) on sprint performance among adolescent soccer players.

METHODS: Twenty-four male soccer players (age: 15.7 [0.5] y; body height: 175.7 [9.4] cm; body mass: 62.5 [9.2] kg) were randomly assigned to the RST group (n = 8), the UST group (n = 10), or the control group (n = 6). The UST group performed 8 × 20 m unresisted sprints twice weekly for 4 weeks, whereas the RST group performed 5 × 20-m heavy resisted sprints with a resistance set to maximize the horizontal power output. The control group performed only ordinary soccer training and match play. Magnitude-based decision and linear regression were used to analyze the data.

RESULTS: The RST group improved sprint performances with moderate to large effect sizes (0.76-1.41) across all distances, both within and between groups (>92% beneficial effect likelihood). Conversely, there were no clear improvements in the UST and control groups. The RST evoked the largest improvements over short distances (6%-8%) and was strongly associated with increased maximum horizontal force capacities (r = .9). Players with a preintervention deficit in force capacity appeared to benefit the most from RST.

CONCLUSIONS: Four weeks of heavy RST led to superior improvements in short-sprint performance compared with UST among adolescent soccer players. Heavy RST, using a load individually selected to maximize horizontal power, is therefore highly recommended as a method to improve sprint acceleration in youth athletes.

Place, publisher, year, edition, pages
Human Kinetics, 2022
Keywords
50%vdec, force–velocity profiling, resistance training, team sport, youth athletes
National Category
Sport and Fitness Sciences
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-6842 (URN)10.1123/ijspp.2020-0959 (DOI)000860648300003 ()34706340 (PubMedID)
Available from: 2021-11-08 Created: 2021-11-08 Last updated: 2022-12-06Bibliographically approved
Gerhardt, K. (2022). Nog nu, politiker – ta klimatkrisen på allvar: 1 944 svenska forskare och anställda i forskarvärlden: Vad är det ni inte förstår?. , Article ID 25 augusti.
Open this publication in new window or tab >>Nog nu, politiker – ta klimatkrisen på allvar: 1 944 svenska forskare och anställda i forskarvärlden: Vad är det ni inte förstår?
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2022 (Swedish)In: article id 25 augustiArticle in journal, News item (Other (popular science, discussion, etc.)) Published
Place, publisher, year, edition, pages
Stockholm: , 2022
Keywords
miljö, klimat
National Category
Engineering and Technology
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-7119 (URN)
Available from: 2022-09-04 Created: 2022-09-04 Last updated: 2022-09-13Bibliographically approved
Petré, H., Ovendal, A., Westblad, N., ten Siethoff, L. & Psilander, N. (2022). Physical Characteristics of Elite Male Bandy Players.. International Journal of Environmental Research and Public Health, 19(19), Article ID 12337.
Open this publication in new window or tab >>Physical Characteristics of Elite Male Bandy Players.
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2022 (English)In: International Journal of Environmental Research and Public Health, ISSN 1661-7827, E-ISSN 1660-4601, Vol. 19, no 19, article id 12337Article in journal (Refereed) Published
Abstract [en]

Physical characteristics of elite male bandy players have not been studied for the last 30 years. Therefore, the purpose of this study was to evaluate the physical characteristics of elite male bandy players with respect to playing positions. A cross-sectional study was performed that included 25 male bandy players from one of the highest-ranked bandy leagues in the world. Body weight, length, isometric mid-thigh pull, countermovement jump, squat jump, unilateral long jump, bilateral long jump, 15- and 30-m sprint, 15-m flying sprint, and VO2max were tested. Players were divided into forwards, midfielders, and defenders. Forwards had significantly (p = 0.012) higher relative VO2max than defenders (59.8 ± 4.3 compared to 53.0 ± 5.6 mL/kg/min). No significant differences for any of the other measurements were observed between positions. This is the first study to present the physical characteristics between playing positions in off- and on-ice tests for male bandy players competing at the highest level. Today's bandy players are heavier and have lower relative VO2max compared with players in the early 1990s. However, their work capacities have increased since their absolute VO2max is higher. These results provide benchmark values that can serve as a foundation for strength and conditioning professionals when designing future training programs.

Place, publisher, year, edition, pages
MDPI, 2022
Keywords
elite athletes, physical profile, team sports, testing
National Category
Sport and Fitness Sciences
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-7379 (URN)10.3390/ijerph191912337 (DOI)000866760700001 ()36231635 (PubMedID)
Available from: 2022-11-10 Created: 2022-11-10 Last updated: 2022-11-15
Danielsson, T., Carlsson, J., Siethoff, L. T., Ahnesjö, J. & Bergman, P. (2020). Aerobic capacity predict skeletal but not cardiac muscle damage after triathlon - the Iron(WO)man study.. Scientific Reports, 10(1), Article ID 901.
Open this publication in new window or tab >>Aerobic capacity predict skeletal but not cardiac muscle damage after triathlon - the Iron(WO)man study.
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2020 (English)In: Scientific Reports, E-ISSN 2045-2322, Vol. 10, no 1, article id 901Article in journal (Refereed) Published
Abstract [en]

This study examines the association between aerobic capacity and biomarkers of skeletal- and cardiac muscle damage among amateur triathletes after a full distance Ironman. Men and women (N = 55) were recruited from local sport clubs. One month before an Ironman triathlon, they conducted a 20 m shuttle run test to determine aerobic capacity. Blood samples were taken immediately after finishing the triathlon, and analyzed for cardiac Troponin T (cTnT), Myosin heavy chain-a (MHC-a), N-terminal prohormone of brain natriuretic peptide (NT-proBNP), Creatin Kinas (CK), and Myoglobin. Regression models examining the association between the biomarkers and aerobic capacity expressed in both relative terms (mLO2*kg-1*min-1) and absolute terms (LO2*min-1) controlled for weight were fitted. A total of 39 subjects (26% females) had complete data and were included in the analysis. No association between aerobic capacity and cardiac muscle damage was observed. For myoglobin, adding aerobic capacity (mLO2*kg-1*min-1) increased the adjusted r2 from 0.026 to 0.210 (F: 8.927, p = 0.005) and for CK the adjusted r2 increased from -0.015 to 0.267 (F: 13.778, p = 0.001). In the models where aerobic capacity was entered in absolute terms the adjusted r2 increased from 0.07 to 0.227 (F: 10.386, p = 0.003) for myoglobin and for CK from -0.029 to 0.281 (F: 15.215, p < 0.001). A negative association between aerobic capacity and skeletal muscle damage was seen but despite the well-known cardio-protective health effect of high aerobic fitness, no such association could be observed in this study.

Place, publisher, year, edition, pages
Nature Publishing Group, 2020
National Category
Sport and Fitness Sciences
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-6011 (URN)10.1038/s41598-020-57842-w (DOI)000512142100139 ()31965015 (PubMedID)
Available from: 2020-01-29 Created: 2020-01-29 Last updated: 2022-09-15
Danielsson, T., Carlsson, J., Schreyer, H., Ahnesjö, J., ten Siethoff, L., Ragnarsson, T., . . . Bergman, P. (2017). Blood biomarkers in male and female participants after an Ironman-distance triathlon. PLOS ONE, 12(6), 1-9, Article ID e0179324.
Open this publication in new window or tab >>Blood biomarkers in male and female participants after an Ironman-distance triathlon
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2017 (English)In: PLOS ONE, E-ISSN 1932-6203, Vol. 12, no 6, p. 1-9, article id e0179324Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: While overall physical activity is clearly associated with a better short-term and long-term health, prolonged strenuous physical activity may result in a rise in acute levels of blood-biomarkers used in clinical practice for diagnosis of various conditions or diseases. In this study, we explored the acute effects of a full Ironman-distance triathlon on biomarkers related to heart-, liver-, kidney- and skeletal muscle damage immediately post-race and after one week's rest. We also examined if sex, age, finishing time and body composition influenced the post-race values of the biomarkers. METHODS: A sample of 30 subjects was recruited (50% women) to the study. The subjects were evaluated for body composition and blood samples were taken at three occasions, before the race (T1), immediately after (T2) and one week after the race (T3). Linear regression models were fitted to analyse the independent contribution of sex and finishing time controlled for weight, body fat percentage and age, on the biomarkers at the termination of the race (T2). Linear mixed models were fitted to examine if the biomarkers differed between the sexes over time (T1-T3). RESULTS: Being male was a significant predictor of higher post-race (T2) levels of myoglobin, CK, and creatinine levels and body weight was negatively associated with myoglobin. In general, the models were unable to explain the variation of the dependent variables. In the linear mixed models, an interaction between time (T1-T3) and sex was seen for myoglobin and creatinine, in which women had a less pronounced response to the race. CONCLUSION: Overall women appear to tolerate the effects of prolonged strenuous physical activity better than men as illustrated by their lower values of the biomarkers both post-race as well as during recovery.

Place, publisher, year, edition, pages
PLOS, 2017
Keywords
Sport and Fitness Sciences, Idrottsvetenskap
National Category
Sport and Fitness Sciences
Identifiers
urn:nbn:se:gih:diva-6439 (URN)10.1371/journal.pone.0179324 (DOI)
Available from: 2020-12-14 Created: 2020-12-14 Last updated: 2021-06-14Bibliographically approved
Lard, M., ten Siethoff, L., Generosi, J., Persson, M., Linke, H. & Månsson, A. (2015). Nanowire-Imposed Geometrical Control in Studies of Actomyosin Motor Function. IEEE Transactions on Nanobioscience, 14(3), 289-297
Open this publication in new window or tab >>Nanowire-Imposed Geometrical Control in Studies of Actomyosin Motor Function
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2015 (English)In: IEEE Transactions on Nanobioscience, ISSN 1536-1241, E-ISSN 1558-2639, Vol. 14, no 3, p. 289-297Article in journal (Refereed) Published
Abstract [en]

Recently, molecular motor gliding assays with actin and myosin from muscle have been realized on semiconductor nanowires coated with Al2O3. This opens for unique nanotechnological applications and novel fundamental studies of actomyosin motor function. Here, we provide a comparison of myosin-driven actin filament motility on Al2O3 to both nitrocellulose and trimethylchlorosilane derivatized surfaces. We also show that actomyosin motility on the less than 200 nm wide tips of arrays of Al2O3-coated nanowires can be used to control the number, and density, of myosin-actin attachment points. Results obtained using nanowire arrays with different inter-wire spacing are consistent with the idea that the actin filament sliding velocity is determined both by the total number and the average density of attached myosin heads along the actin filament. Further, the results are consistent with buckling of long myosin-free segments of the filaments as a factor underlying reduced velocity. On the other hand, the findings do not support a mechanistic role in decreasing velocity, of increased nearest neighbor distance between available myosin heads. Our results open up for more advanced studies that may use nanowire-based structures for fundamental investigations of molecular motors, including the possibility to create a nanowire-templated bottom-up assembly of 3D, muscle-like structures.

Keywords
Actin, aluminum oxide, in vitro motility assay, myosin, oxide-coated nanowire, sarcomere, Biochemistry and Molecular Biology, Biokemi och molekylärbiologi
National Category
Biochemistry and Molecular Biology
Identifiers
urn:nbn:se:gih:diva-6445 (URN)10.1109/TNB.2015.2412036 (DOI)
Available from: 2020-12-14 Created: 2020-12-14 Last updated: 2020-12-21Bibliographically approved
ten Siethoff, L., Lard, M., Generosi, J., Andersson, H. S., Linke, H. & Månsson, A. (2014). Molecular Motor Propelled Filaments Reveal Light-Guiding in Nanowire Arrays for Enhanced Biosensing. Nano letters (Print), 14(2), 737-742
Open this publication in new window or tab >>Molecular Motor Propelled Filaments Reveal Light-Guiding in Nanowire Arrays for Enhanced Biosensing
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2014 (English)In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 14, no 2, p. 737-742Article in journal (Refereed) Published
Abstract [en]

Semiconductor nanowire arrays offer significant potential for biosensing applications with optical read-out due to their high surface area and due to the unique optical properties of one-dimensional materials. A challenge for optical read-out of analyte-binding to the nanowires is the need to efficiently collect and detect light from a three-dimensional volume. Here we show that light from fluorophores attached along Several mu m long vertical Al2O3 coated gallium phosphide nanowires couples into the wires, is guided along them and emitted at the tip. This enables effective collection of light emitted by fluorescent analytes located at different focal planes along the nanowire. We unequivocally demonstrate the light-guiding effect using a novel method whereby the changes in emitted fluorescence intensity are observed when fluorescent cytoskeletal filaments are propelled by molecular motors along the wires. The findings are discussed in relation to nanobiosensor developments, other nanotechnological applications, and fundamental studies of motor function.

Keywords
Nanobiotechnology, in vitro motility assay, photonics, actin, myosin, actomyosin, Chemical Sciences, Kemi
National Category
Chemical Sciences
Identifiers
urn:nbn:se:gih:diva-6451 (URN)10.1021/nl404032k (DOI)
Available from: 2020-12-14 Created: 2020-12-14 Last updated: 2020-12-21Bibliographically approved
Lard, M., ten Siethoff, L., Generosi, J., Månsson, A. & Linke, H. (2014). Molecular Motor Transport through Hollow Nanowires. Nano letters (Print), 14(6), 3041-3046
Open this publication in new window or tab >>Molecular Motor Transport through Hollow Nanowires
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2014 (English)In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 14, no 6, p. 3041-3046Article in journal (Refereed) Published
Abstract [en]

Biomolecular motors offer self-propelled, directed transport in designed microscale networks and can potentially replace pump-driven nanofluidics. However, in existing systems, transportation is limited to the two-dimensional plane. Here we demonstrate fully one-dimensional (1D) myosin-driven motion of fluorescent probes (actin filaments) through 80 nm wide, Al2O3 hollow nanowires of micrometer length. The motor-driven transport is orders of magnitude faster than would be possible by passive diffusion. The system represents a necessary element for advanced devices based on gliding assays, for example, in lab-on-a-chip systems with channel crossings and in pumpless nanosyringes. It may also serve as a scaffold for bottom-up assembly of muscle proteins into actin ordered contractile units, mimicking the muscle sarcomere.

Keywords
Hollow nanowires, actin, myosin, molecular motors, motor proteins, 1D gliding assay, Materials Chemistry, Materialkemi
National Category
Materials Chemistry
Identifiers
urn:nbn:se:gih:diva-6444 (URN)10.1021/nl404714b (DOI)
Available from: 2020-12-14 Created: 2020-12-14 Last updated: 2020-12-21Bibliographically approved
Persson, M., Bengtsson, E., ten Siethoff, L. & Månsson, A. (2014). Non-Linear Cross-Bridge Elasticity, ATP-Independent Detachment and ATP-Velocity Relationships for Skeletal Muscle Actomyosin. Paper presented at 58th Annual Meeting of the Biophysical-Society, FEB 15-19, 2014, San Francisco, CA. Biophysical Journal, 106(2), 158A-158A
Open this publication in new window or tab >>Non-Linear Cross-Bridge Elasticity, ATP-Independent Detachment and ATP-Velocity Relationships for Skeletal Muscle Actomyosin
2014 (English)In: Biophysical Journal, ISSN 0006-3495, E-ISSN 1542-0086, Vol. 106, no 2, p. 158A-158AArticle in journal, Meeting abstract (Other academic) Published
Keywords
Biochemistry and Molecular Biology, Biokemi och molekylärbiologi
National Category
Biochemistry and Molecular Biology
Identifiers
urn:nbn:se:gih:diva-6450 (URN)
Conference
58th Annual Meeting of the Biophysical-Society, FEB 15-19, 2014, San Francisco, CA
Available from: 2020-12-14 Created: 2020-12-14 Last updated: 2020-12-21Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-6878-3142

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