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Ragnarsson, Thony
Publications (4 of 4) Show all publications
Ragnarsson, T. (2018). Effekterna av djupa explosiva knäböjningar på löpekonomin hos långdistanslöpare. (Student paper). Linnéuniversitetet
Open this publication in new window or tab >>Effekterna av djupa explosiva knäböjningar på löpekonomin hos långdistanslöpare
2018 (Swedish)Student thesis
Abstract [sv]

Tidigare forskning visar på ett positivt samband mellan styrketräning och löpekonomi. I föreliggande studie undersöktes effekten av djupa explosiva knäböjningar på löpekonomin hos långdistanslöpare. I studien deltog elva deltagare varav sex i interventionsgruppen och fem i kontrollgruppen. Styrketräningen skulle vara tidseffektivt, max 20 min och då enbart en övning. Basövningen knäböjning med stången bakom nacken valdes. Huvuddelen av all knäböjsträning under en åtta veckors period, utfördes med en belastning på 60% av 1RM 2-6 rep i 2-6 set och då med fokus hög hastighet i både den excentriska och koncentriska fasen samt ca 1 min vila mellan seten. Efter avslutad träningsperiod sågs signifikant förbättring vad gäller maxstyrka, 1RM och maximal Power. Samtliga deltagare i interventionsgruppen fick en positiv styrkeökning med ett snitt på 14,5%. Studien visar även en tendens till förbättrad löpekonomi hos interventionsgruppen.

Abstract [en]

Previous research shows a positive link between strength training and running economics. In the present study, the effect of deep power squats on the running economics of long distance runners was investigated. The study included eleven participants, six were in the intervention group and five in the control group. The strength training would be time efficient, max 20 min and then only one exercise. We chose the basic exercise squats with the barbell behind the neck. The majority of all squats exercises during a period eight week with a load of 60% of 1RM 2-6 reps in 2-6 sets and then focused high speed in both the eccentric and concentric phase and about 1 min rest between the sets. At the end of the training period, we could see a significant improvement in maximal 1RM and maximum Power. All participants in the intervention group received a positive increase in strength, with an average of 14.5%. The study also shows a tendency for improved running economics in the intervention group.

Keywords
Högintensiv träning, prestationsutveckling, stretch-shortening cykeln, styrketräning, syrekostnaden för löpning.
National Category
Sport and Fitness Sciences
Identifiers
urn:nbn:se:lnu:diva-72993 (URN)
Thesis level
Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsSport Science
Presentation
2018-04-11, V155, Storken, Stagneliusgatan, Kalmar, 11:15 (Swedish)
Supervisors
Examiners
Available from: 2018-04-18 Created: 2018-04-18 Last updated: 2018-04-18Bibliographically approved
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, ISSN 1932-6203, 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
National Category
Sport and Fitness Sciences
Research subject
Social Sciences, Sport Science
Identifiers
urn:nbn:se:lnu:diva-65765 (URN)10.1371/journal.pone.0179324 (DOI)000403274700028 ()28609447 (PubMedID)2-s2.0-85020735267 (Scopus ID)
Available from: 2017-06-22 Created: 2017-06-22 Last updated: 2019-09-06Bibliographically approved
Carlsson, J., Ragnarsson, T., Danielsson, T., Johansson, T., Schreyer, H., Breyne, A. & Bergman, P. (2016). Hjärtmarkörer ökar efter intensiv motion - oklar klinisk betydelse: Data från förstudie av Kalmar IronWoman-studien visar på troponin T-värden som vid hjärtinfarkt. Läkartidningen, 113(31-33), Article ID D3CR.
Open this publication in new window or tab >>Hjärtmarkörer ökar efter intensiv motion - oklar klinisk betydelse: Data från förstudie av Kalmar IronWoman-studien visar på troponin T-värden som vid hjärtinfarkt
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2016 (Swedish)In: Läkartidningen, ISSN 0023-7205, E-ISSN 1652-7518, Vol. 113, no 31-33, article id D3CRArticle in journal (Refereed) Published
Abstract [en]

Biochemical changes after strenuous exercise - data from the Kalmar Ironman

Strenuous and prolonged exercise like marathon, ultra running and triathlon can lead to changes in biomarkers of cardiac, muscle and kidney functional damage. We present the data of 30 (15 men, 15 women) participants of the Kalmar Ironman 2015. Pre-race electrocardiograms and echocardiograms showed a high frequency of abnormalities. Post race elevations of troponin T, creatine kinase, myoglobin, N-terminal prohormone of brain natriuretic peptide, and creatinine returned to normal in almost all cases within 5-8 days. In all but one participant the troponin T pattern was compatible with the diagnosis of myocardial infarction. It is an up-to-date unanswered question whether the increase of troponin represents myocardial damage or just is a benign consequence of an intermittent change of the permeability of myocardial cell membranes.

Abstract [sv]

Intensiv uthållighetsidrott som maratonlöpning och triatlon påverkar alla organsystem, och akuta förändringar har visats inte minst för hjärt- och njurfunktion.   

Vi rapporterar data från 30 deltagare i Kalmar Ironman (15 män, 15 kvinnor) som undersökts med EKG, ekokardiografi och blodprov.

Akuta stegringar av hjärt-, muskel- och njurvärden var mycket vanliga. Samtliga deltagare förutom en uppvisade direkt efter tävlingen troponin T-värden som skulle vara förenliga med diagnosen hjärtinfarkt. 

Det är oklart om troponinläckaget står för en hjärtmuskelskada eller om det är en godartad konsekvens av en tillfällig ändring av permeabiliteten av hjärtmuskelcellerna.

Place, publisher, year, edition, pages
Läkartidningen Förlag, 2016
National Category
Cardiac and Cardiovascular Systems
Research subject
Natural Science, Medicine
Identifiers
urn:nbn:se:lnu:diva-55132 (URN)2-s2.0-84983009819 (Scopus ID)
Available from: 2016-08-08 Created: 2016-08-08 Last updated: 2019-08-09Bibliographically approved
Carlsson, J., Ragnarsson, T., Danielsson, T. & Bergman, P. (2016). Increase of biomarkers after the Kalmar Ironman in male and female non-elite triathletes. In: : . Paper presented at The 63rd annual conference of the Israel heart society, Tel Aviv, Israel, April 12-13, 2016.
Open this publication in new window or tab >>Increase of biomarkers after the Kalmar Ironman in male and female non-elite triathletes
2016 (English)Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

Strenuous and prolonged exercise like marathon, ultra running and triathlon can lead to changes in biomarkers of cardiac, muscle and kidney functional damage.

We present the data of 29 (15 male, 14 female) non-elite participants of the Kalmar Ironman 2015 3.8 km swimming, 180 km cycling, 42 km running). Pre-race electrocardiograms and echocardiograms showed a high frequency of abnormalities. Post race elevations of troponin T, creatine kinase, myoglobin, N-terminal pro b-type natriuretic peptide, aspartataminotransferas, creatinine and leucocytes returned to normal in almost all cases within 5-8 days. In 100% of male and 93% of female participants’ troponin T increase was compatible with the diagnosis of minor myocardial infarction. Some results are shown in the table (* denotes level of significance between male and female results).

                                           Before race         Directly after race        5-8 days after race

CK [µkat/L]                                      

male                                                 3.7 ± 2.1**       48,1 ± 44.1                4.5 ± 4.0

female                                   1.5 ± 0.7          30.5 ± 41.5                3.1 ± 3.6

Myoglobin [µg/L

male                                      58.3 ± 35.9        2449 ± 1923             51.3 ± 38.5

female                                    30.6 ± 11.0         1134 ± 756*             50.4 ± 67.7

Creatinine [µmol/L]

male                                       87.4 ± 11.4         119.9 ± 23.4           85.1 ± 12.1

female                                     73.0 ± 13.4         84.1 ± 14.1***        69.6 ± 6.3

p-NT-proBNP [ng/L]

male                                        60.1 ± 25.2          658.7 ± 354.9        61.9 ± 22.7

female                                      95.5 ± 69.5          907.9 ± 433.1        76.9 ± 26.9

Troponin T [ng/L]

male                                         8.5 ± 4.3             68.1 ± 41.1           7.4 ± 4.4

female                                       7.1 ± 4.9             54.3 ± 49.5           5.8 ± 1.7

The results will be discussed in the light of the current literature and the so far unanswered question about the long-term significance of repetitive organ damage due to strenuous exercise. Long-term follow-up of these athletes is needed.

National Category
Cardiac and Cardiovascular Systems
Research subject
Natural Science, Medicine
Identifiers
urn:nbn:se:lnu:diva-53549 (URN)
Conference
The 63rd annual conference of the Israel heart society, Tel Aviv, Israel, April 12-13, 2016
Available from: 2016-06-15 Created: 2016-06-15 Last updated: 2017-02-16Bibliographically approved
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