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Ivarsson, N., Mattsson, C. M., Cheng, A. J., Bruton, J. D., Ekblom, B., Lanner, J. T. & Westerblad, H. (2019). SR Ca2+ leak in skeletal muscle fibers acts as an intracellular signal to increase fatigue resistance.. The Journal of General Physiology, Article ID jgp.201812152.
Open this publication in new window or tab >>SR Ca2+ leak in skeletal muscle fibers acts as an intracellular signal to increase fatigue resistance.
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2019 (English)In: The Journal of General Physiology, ISSN 0022-1295, E-ISSN 1540-7748, article id jgp.201812152Article in journal (Refereed) Epub ahead of print
Abstract [en]

Effective practices to improve skeletal muscle fatigue resistance are crucial for athletes as well as patients with dysfunctional muscles. To this end, it is important to identify the cellular signaling pathway that triggers mitochondrial biogenesis and thereby increases oxidative capacity and fatigue resistance in skeletal muscle fibers. Here, we test the hypothesis that the stress induced in skeletal muscle fibers by endurance exercise causes a reduction in the association of FK506-binding protein 12 (FKBP12) with ryanodine receptor 1 (RYR1). This will result in a mild Ca2+ leak from the sarcoplasmic reticulum (SR), which could trigger mitochondrial biogenesis and improved fatigue resistance. After giving mice access to an in-cage running wheel for three weeks, we observed decreased FKBP12 association to RYR1, increased baseline [Ca2+]i, and signaling associated with greater mitochondrial biogenesis in muscle, including PGC1α1. After six weeks of voluntary running, FKBP12 association is normalized, baseline [Ca2+]i returned to values below that of nonrunning controls, and signaling for increased mitochondrial biogenesis was no longer present. The adaptations toward improved endurance exercise performance that were observed with training could be mimicked by pharmacological agents that destabilize RYR1 and thereby induce a modest Ca2+ leak. We conclude that a mild RYR1 SR Ca2+ leak is a key trigger for the signaling pathway that increases muscle fatigue resistance.

Place, publisher, year, edition, pages
Rockefeller University Press, 2019
National Category
Physiology
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5547 (URN)10.1085/jgp.201812152 (DOI)30635368 (PubMedID)
Available from: 2019-01-16 Created: 2019-01-16 Last updated: 2019-01-16Bibliographically approved
Petré, H., Wernstål, F. & Mattsson, C. M. (2018). Effects of Flywheel Training on Strength-Related Variables: a Meta-analysis.. Sports medicine - open, 4(1), Article ID 55.
Open this publication in new window or tab >>Effects of Flywheel Training on Strength-Related Variables: a Meta-analysis.
2018 (English)In: Sports medicine - open, ISSN 2199-1170, Vol. 4, no 1, article id 55Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: Strength and power development are abilities important for athletic performance in many sports. Generally, resistance training based on gravity is used to improve these qualities. Flywheel training instead utilizes kinetic energy transferred to a flywheel. This allows for eccentric overload and variable resistance throughout the movement. The aim of this review was to identify the effects of flywheel training on multiple strength-related variables affecting athletic performance. The meta-analysis investigates the effects on (1) muscle growth (cross-sectional area (CSA) and volume/mass), (2) maximum dynamic strength, (3) development of power, (4) development of horizontal movement, and (5) development of vertical movement.

METHODS: The meta-analysis includes 20 experimental studies that met the inclusion criteria. The quality of included studies was ranked according to the PEDro scale. Possible bias was identified in Funnel plot analyses. To enable the compilation of all results analyses, the random effect model was carried out using the software Review Manager Version 5.3 and presented with Forest plots.

RESULTS: Flywheel training for a period of 4-24 weeks shows statistically significant increases in all strength aspects. Effect sizes were for hypertrophy, CSA 0.59; volume/mass 0.59; maximum strength 1.33; power 1.19; horizontal 1.01 and vertical movement 0.85. The evidence is particularly strong for beneficial effects from flywheel training in the development of maximal strength and power in trained younger individuals, and utilization of this training modality in shorter more intensive blocks.

CONCLUSIONS: Flywheel training is an effective method for improving several aspects of strength and power with importance for sports performance.

Keywords
Horizontal movement, Maximum strength, Muscle hypertrophy, Power, Vertical movement
National Category
Sport and Fitness Sciences
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5505 (URN)10.1186/s40798-018-0169-5 (DOI)30547232 (PubMedID)
Available from: 2018-12-17 Created: 2018-12-17 Last updated: 2018-12-17
Moesch, K., Kenttä, G., Bäckström, M. & Mattsson, C. M. (2018). Nonverbal post-shot celebrations and their relationship with performance in elite handball. International Journal of Sport and Exercise Psychology, 16(3), 235-249
Open this publication in new window or tab >>Nonverbal post-shot celebrations and their relationship with performance in elite handball
2018 (English)In: International Journal of Sport and Exercise Psychology, ISSN 1612-197X, E-ISSN 1557-251X, Vol. 16, no 3, p. 235-249Article in journal (Refereed) Published
Abstract [en]

Nonverbal behaviour has an important function in team sports, but research is limited. Adopting a psychological momentum (PM) framework, this study explores the relationship between a team’s history of events, nonverbal post-shot celebrations in the form of gestures and touch shown by the shooter after scoring, and subsequent team performance during handball matches. A naturalistic design with systematic observation was chosen for the present study. Based on an existing coding scheme, 616 post-shot periods from 18 high-stake matches of the highest league in Sweden were analysed. Results showed that the better a team’s prior performance, the more gestures were displayed after scoring in the following period. A high degree of touch when playing well, and a low degree of touch when playing poorly were related to positive subsequent team performance, while, showing much touch when playing poorly, or showing little touch when playing well were related to negative subsequent team performance. The amount of displayed gesture and touch alone was not significantly related to subsequent team performance. To conclude, nonverbal post-shot celebrations were related to subsequent team performance, but only when the ongoing history of events was taken into account, and only for touch. Based on these results, the history of events emerges as an important variable when the dynamics of ongoing team sport matches are investigated. Furthermore, touch, compared to gesture, seems to be of more importance for subsequent team performance. As expected when investigating complex phenomena in ongoing matches, the findings resulted in small effect sizes.

Keywords
touch, gesture, psychological momentum, emotional expression, team sport
National Category
Applied Psychology Sport and Fitness Sciences
Research subject
Social Sciences/Humanities
Identifiers
urn:nbn:se:gih:diva-4588 (URN)10.1080/1612197X.2016.1216148 (DOI)000435030100003 ()
Funder
Swedish National Centre for Research in Sports
Available from: 2016-09-28 Created: 2016-09-28 Last updated: 2018-08-17Bibliographically approved
Petré, H., Ovendal, A., Westblad, N. & Mattsson, C. M. (2018). Skador inom parkour och preventiva åtgärder. Idrottsmedicin, 37(4), 4-9
Open this publication in new window or tab >>Skador inom parkour och preventiva åtgärder
2018 (Swedish)In: Idrottsmedicin, ISSN 1103-7652, Vol. 37, no 4, p. 4-9Article in journal (Other academic) Published
Place, publisher, year, edition, pages
Svensk förening för fysisk aktivitet och idrottsmedicin, 2018
National Category
Sport and Fitness Sciences
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5480 (URN)
Available from: 2018-11-29 Created: 2018-11-29 Last updated: 2018-12-17Bibliographically approved
Shcherbina, A., Mattsson, C. M., Waggott, D., Salisbury, H., Christle, J. W., Hastie, T. J., . . . Ashley, E. A. (2016). Accuracy in wrist-worn, sensor-based measurements of heart rate and energy expenditure in a diverse cohort. , Article ID 094862.
Open this publication in new window or tab >>Accuracy in wrist-worn, sensor-based measurements of heart rate and energy expenditure in a diverse cohort
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2016 (English)Manuscript (preprint) (Other academic)
Abstract [en]

Background: The ability to measure activity and physiology through wrist-worn devices provides an opportunity for cardiovascular medicine. However, the accuracy of commercial devices is largely unknown. Objective: To assess the accuracy of seven commercially available wrist-worn devices in estimating heart rate (HR) and energy expenditure (EE) and to propose a wearable sensor evaluation framework. Methods: We evaluated the Apple Watch, Basis Peak, Fitbit Surge, Microsoft Band, Mio Alpha 2, PulseOn, and Samsung Gear S2. Participants wore devices while being simultaneously assessed with continuous telemetry and indirect calorimetry while sitting, walking, running, and cycling. Sixty volunteers (29 male, 31 female, age 38 +/- 11 years) of diverse age, height, weight, skin tone, and fitness level were selected. Error in HR and EE was computed for each subject/device/activity combination. Results: Devices reported the lowest error for cycling and the highest for walking. Device error was higher for males, greater body mass index, darker skin tone, and walking. Six of the devices achieved a median error for HR below 5% during cycling. No device achieved an error in EE below 20 percent. The Apple Watch achieved the lowest overall error in both HR and EE, while the Samsung Gear S2 reported the highest. Conclusions: Most wrist-worn devices adequately measure HR in laboratory-based activities, but poorly estimate EE, suggesting caution in the use of EE measurements as part of health improvement programs. We propose reference standards for the validation of consumer health devices (http://precision.stanford.edu/).

Keywords
mobile health, heart rate, energy expenditure, validation, fitness trackers, activity monitors
National Category
Other Medical Biotechnology Physiology
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-4762 (URN)10.1101/094862 (DOI)
Available from: 2017-01-29 Created: 2017-01-29 Last updated: 2018-01-13Bibliographically approved
Godhe, M., Helge, T., Mattsson, C. M. & Ekblom, B. (2016). Att bära tungt - en fysiologisk analys: Kvinnor: Rapport 8..
Open this publication in new window or tab >>Att bära tungt - en fysiologisk analys: Kvinnor: Rapport 8.
2016 (Swedish)Report (Other academic)
Abstract [sv]

Sjutton kvinnliga vältränade försökspersoner, åtta stycken med vana att bära tungt och nio stycken utan sådan vana, genomförde gång på löpband och mjukt underlag i hastigheterna 3 och 5 km/tim med bärvikter i ryggsäck på 20, 35 och 50 kg.Mjukt underlag i form av blå gymnastikmattor, indikerande gång i lätt terräng, ökade energiomsättningen under både hastigheterna mellan 10 och 15 %, jämfört med hårt underlag (löpband) med en grads lutning. Energiomsättningen ökade i genomsnitt lika mycket med ökad hastighet som med ökad bärvikt. Den individuella variationen vid en given bärvikt och hastighet är mycket stor. Beroende på bärvikt och hastighet kan energiomsättningen variera med 100 %. Dessa stora variationer i energiomsättning bör uppmärksammas vid beräkning av energitilldelning via kosten vid längre militära operationer.Energiomsättningen vid tyngsta belastningen – 50 kilo bärvikt och hastigheten 5 km/tim – belastade försökspersonerna på i genomsnitt 57 % av maximal syreupptagningsförmåga. I individuella fall var belastningen 72 % av maximal syreupptagningsförmåga. Dessa höga belastningar är oacceptabelt höga för transporter under längre tid och kan vara en orsak till belastningsskador.Förmågan att bära tungt sammanfaller med ökad kroppsvikt och benmuskelstyrka. Bärförmåga för mindre vikter, högst 35 kg, sammanfaller inte med någon av ovanstående faktorer. Således, för tyngre bärvikter vid förflyttningar bör selektion av soldater ske enligt de uppmätta parametrarna, medan vad gäller lättare vikter föreligger inte samma selektionskriterier.En slutsats från resultaten av denna undersökning är den ursprungliga uttagningen till tunga arbetsuppgifter inom försvaret bör genomföras med tunga arbetsbelastningar, motsvarande de i denna undersökning. I kommande rapport sammanfattas studierna på män och kvinnors bärförmåga, likheter och olikheter mellan könen, möjliga selektionskriterier samt rekommendationer med utgångspunkt från genomförda undersökningar och resultat från olika andra undersökningar.

Publisher
p. 30
Keywords
Energiutgift, tunga arbetsuppgifter, fysiskt stridsvärde, soldater
National Category
Occupational Health and Environmental Health Sport and Fitness Sciences
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-4593 (URN)
Projects
Militärmedicinsk forskning
Available from: 2016-09-28 Created: 2016-09-28 Last updated: 2018-01-10Bibliographically approved
Jansson, D. & Mattsson, C. M. (2016). Effects of Unilateral Versus Bilateral Complex Training Combined with High Intensity Interval Training on the Development of Strength, Power and Athletic Performance for Elite Handball Players. In: : . Paper presented at 10th International Conference On Strength Training. November 30 - December 2 2016, Kyoto, Japan..
Open this publication in new window or tab >>Effects of Unilateral Versus Bilateral Complex Training Combined with High Intensity Interval Training on the Development of Strength, Power and Athletic Performance for Elite Handball Players
2016 (English)Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

Introduction

Unilateral (UL) training as an alternative method for developing athletic performance are not well studied (1, 2). The purpose is to examine the effects of bilateral (BL) versus UL complex training combined with high intensity interval training (HIIT) on bilateral deficit (BLD), power deficit, maximal strength, jumping ability, straight sprint, change of direction sprint (CODS), repeated sprint ability (RSA) and specific endurance in elite handball players.

Methods

18 male and 12 female elite handball players were assigned to a BL (n=10) or UL (n=20) complex training program. In addition both groups trained HIIT twice a week. Training volume, intensity and exercise motions were similar between the groups. Tests included 1RM UL and BL Smith machine squat, UL and BL counter movement jump (CMJ), squat jump (SJ), modified T-test, straight sprint (5, 10, 20 and 30 m), repeated shuttle sprint ability (RSSA) and Yo-Yo Intermittent Recovery test (YYIR) before and after 6 weeks of training.

Results

Pooled data from both groups showed significant (p <0.01) improvements in maximal UL and BL strength, UL CMJ dominant leg, CODS and YYIR test, and an unwanted increase in the BLD and power deficit.

There were no significant differences training groups in any of the tests. However, only the UL group significantly improved RSAtotal pre- to post testing (p < 0.01).

Discussion

Results indicate that this type of training is a relevant model for pre-season training of maximal strength, power and functional endurance. Despite the lack of differences between groups, UL training can be safer than BL training because of less absolute load.

1) Jones MT, Ambeganokar JP, Nindl BC, Smith JA, Headley SA. (2012). J Strength Cond Res, 26(4), 1094-100

2) McCurdy K, Langford G, Doscher MW, Wiley LP, Mallard KG. (2005). J Strength Cond Res, 19(1), 9-15

Keywords
bilateral training, unilateral training, handball, bilateral deficit, complex training
National Category
Sport and Fitness Sciences Physiology
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-4603 (URN)
Conference
10th International Conference On Strength Training. November 30 - December 2 2016, Kyoto, Japan.
Available from: 2016-10-07 Created: 2016-10-07 Last updated: 2018-01-14Bibliographically approved
Mattsson, C. M., Jansson, E. & Hagströmer, M. (2016). Fysisk aktivitet - begrepp och definitioner. In: FYSS 2017: fysisk aktivitet i sjukdomsprevention och sjukdomsbehandling (pp. 21-34). Läkartidningen förlag
Open this publication in new window or tab >>Fysisk aktivitet - begrepp och definitioner
2016 (Swedish)In: FYSS 2017: fysisk aktivitet i sjukdomsprevention och sjukdomsbehandling, Läkartidningen förlag , 2016, p. 21-34Chapter in book (Other academic)
Abstract [sv]

Sammanfattning

Fysisk aktivitet är ett komplext beteende och definieras, rent fysiologiskt, som all kroppsrörelse som ökar energiförbrukningen utöver viloförbrukning.

Aerob fysisk aktivitet är den vanligaste formen och kan utföras på olika intensiteter, från låg till mycket hög. Aerob fysisk aktivitet som utförs i strukturerad form med syfte att öka eller bibehålla konditionen kan benämnas konditionsträning.

Muskelstärkande fysisk aktivitet är den form av fysisk aktivitet som belastar och ställer krav på muskelstyrkan. Muskelstärkande fysisk aktivitet som utförs i strukturerad form kan benämnas styrketräning.

Grundläggande principer för kroppens svar på träning, som ”overload”, progression, reversibilitet, specificitet och individuella skillnader presenteras.

Place, publisher, year, edition, pages
Läkartidningen förlag, 2016
National Category
Public Health, Global Health, Social Medicine and Epidemiology
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-4702 (URN)9789198171129 (ISBN)
Available from: 2017-01-11 Created: 2017-01-11 Last updated: 2017-01-20Bibliographically approved
Mattsson, C. M. (2016). Hjärtats adaptation till träning. In: Mats Börjesson & Mikael Dellborg (Ed.), Idrott och hjärtat: (pp. 21-36). Studentlitteratur AB
Open this publication in new window or tab >>Hjärtats adaptation till träning
2016 (Swedish)In: Idrott och hjärtat / [ed] Mats Börjesson & Mikael Dellborg, Studentlitteratur AB, 2016, p. 21-36Chapter in book (Other (popular science, discussion, etc.))
Abstract [sv]

Boken Idrott och hjärtat beskriver de positiva effekterna av träning och fysisk aktivitet men tar också upp risker förenade med högintensiv aktivitet. Boken ger en god inblick i de grundläggande förändringarna i hjärtats arbete vid träning, på motions- och elitnivå.


Idrott och hjärtat är uppbyggd i tre delar: ”Det (troligen) friska hjärtat”, ”Det sjuka hjärtat” samt den tredje delen ”Praktiska tillämpningar” vilken beskriver dels undersökningstekniker och utredningsgång, viktiga och vanliga differentialdiagnoser och symtom, allt relaterat till hjärta och idrott.


Idrott och hjärtat riktar sig till lagläkare och andra idrottsmedicinskt engagerade, till idrottsintresserade specialister inom kardiologi, internmedicin, klinisk fysiologi och allmänmedicin samt till specialintresserade sjuksköterskor och fysioterapeuter.

Place, publisher, year, edition, pages
Studentlitteratur AB, 2016
National Category
Cardiac and Cardiovascular Systems
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-4591 (URN)9789144096186 (ISBN)
Available from: 2016-09-28 Created: 2016-09-28 Last updated: 2017-01-20Bibliographically approved
Ekblom, B., Helge, T., Godhe, M., Pettersson, T. & Mattsson, M. C. (2016). Rekommendationer gällande bärvikter och förflyttningshastigheter under längre fältoperationer. Beräkningar av energiomsättning.
Open this publication in new window or tab >>Rekommendationer gällande bärvikter och förflyttningshastigheter under längre fältoperationer. Beräkningar av energiomsättning
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2016 (Swedish)Report (Other academic)
Publisher
p. 7
Keywords
Bärförmåga, energiomsättning
National Category
Medical and Health Sciences
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-4649 (URN)
Projects
Försvarsmedicinsk forskningMilitärprojektet
Available from: 2016-11-24 Created: 2016-11-24 Last updated: 2018-04-26Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-0642-4838

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