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Sökning: WFRF:(Folkesson Mattias)

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  • Folkesson, Mattias, 1972-, et al. (författare)
  • The expression of heat shock protein in human skeletal muscle : effects of muscle fibre phenotype and trainingbackground
  • 2013
  • Ingår i: Acta Physiologica. - 1748-1708. ; 209:1, s. 26-33
  • Tidskriftsartikel (refereegranskat)abstract
    • AimExercise-induced adaptations of skeletal muscle are related to training mode and can be muscle fibre type specific. This study aimed to investigate heat shock protein expression in type I and type II muscle fibres in resting skeletal muscle of subjects with different training backgrounds.MethodsThree groups of subjects were included: healthy active not engaged in any training programme (ACT, n = 12), resistance trained (RES, n = 6) and endurance trained (END, n = 8). Biopsies were obtained from vastus lateralis, and immunohistochemistry was performed using monoclonal antibodies against myosin heavy chain I and IIA, ?B-crystallin, HSP27, HSP60 and HSP70.ResultsIn ACT and RES, but not in END, a fibre type–specific expression with higher staining intensity in type I than type II fibres was seen for ?B-crystallin. The opposite (II > I) was found for HSP27 in subjects from ACT (6 of 12 subjects) and RES (3 of 6), whereas all subjects from END displayed uniform staining. HSP60 showed no fibre-specific expression. HSP70 displayed a fibre-specific expression pattern (I > II) in ACT (4 of 12), but not in END or RES.ConclusionThis study shows that the level of expression of the different HSPs in human skeletal muscle is influenced by muscle fibre phenotype. The fibre type–specific expression of HSP70 is influenced by resistance and endurance training, whereas those of ?B-crystallin and HSP27 is influenced only by endurance training, suggesting the existence of a training-modality-specific action on the adaptive processes including heat shock proteins in human skeletal muscle.
  • Fransson, Johan E.S., et al. (författare)
  • Mapping of Wind-Thrown Forests Using VHF/UHF SAR Images
  • 2007
  • Ingår i: IEEE 2007 International Geoscience and Remote Sensing Symposium (IGARSS 2007), Barcelona, Spain, July 23-27 2007. ; DOI: 10.1109/IGARSS.2007.4423313, s. 2350-2353
  • Konferensbidrag (övrigt vetenskapligt)abstract
    • SAR images from the Swedish airborne CARABAS-II and LORA systems have been visually analyzed over simulated wind-thrown forest at both single tree and stand level. In ideal conditions, the results show that LORA is more accurate than CARABAS-II at detecting wind-thrown trees, regardless of tree size and direction of the fallen trees relative to flight heading. Furthermore, the visible single trees in the LORA images appeared more distinct than in the CARABAS-II images, which could be explained by the high resolution in the LORA images. Based on visual interpretation, it is likely that the detection of wind-thrown forests could be improved using VHF/UHF SAR images acquired both prior to and after a storm event.
  • Kadi, Fawzi, et al. (författare)
  • Strength, muscular endurance and EMG characteristics of thigh adductors
  • 2006
  • Ingår i: Isokinetics and exercise science. - 0959-3020. ; 14:3, s. 235-239
  • Tidskriftsartikel (refereegranskat)abstract
    • The assessment of thigh adductors' strength and endurance and electromyographical (EMG) characteristics has received little attention compared to other muscle groups. The aim of this study was to investigate strength, endurance performance and EMG characteristics of m. adductor longus and m. gracilis during concentric thigh adduction in soccer and bandy players. Muscular endurance was evaluated using the torque reduction during 70 repeated maximum concentric adductions at an angular velocity of 60°/s. The EMG mean frequency (MNF) and the signal amplitude ratio (SAR, index for muscles' ability to relax between contractions) were analysed. Peak torque decreased significantly throughout the test and no significant differences were found between the two groups. In both muscles, MNF decreased significantly throughout the test. There were no significant differences in MNF and in SAR variables between soccer and bandy players. In conclusion, the present findings reveal a number of significant aspects related to strength and electromyography of hip adductors. © 2006 - IOS Press and the authors. All rights reserved.
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