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1.
2.
  • Andersson, Helena M, et al. (författare)
  • Elite football on artificial turf versus natural grass : movement patterns, technical standards, and player impressions
  • 2008
  • Ingår i: Journal of Sports Sciences. - 0264-0414. ; 26:2, s. 113-22
  • Tidskriftsartikel (refereegranskat)abstract
    • The aim of the present study was to examine the movement patterns, ball skills, and the impressions of Swedish elite football players during competitive games on artificial turf and natural grass. Time - motion analyses (36 observations) and technical analyses (16 team observations) were performed and 72 male and 21 female players completed a questionnaire. No differences were observed between artificial turf and natural grass in terms of total distance covered (mean 10.19 km, s = 0.19 vs. 10.33 km, s = 0.23), high-intensity running (1.86 km, s = 0.10 vs. 1.87 km, s = 0.14), number of sprints (21, s = 1 vs. 22, s = 2), standing tackles (10, s = 1 vs. 11, s = 1) or headers per game (8, s = 1 vs. 8, s = 1), whereas there were fewer sliding tackles (P < 0.05) on artificial turf than natural grass (2.1, s = 0.5 vs. 4.3, s = 0.6). There were more short passes (218, s = 14 vs. 167, s = 12) and midfield-to-midfield passes (148, s = 11 vs. 107, s = 8) (both P < 0.05) on artificial turf than natural grass. On a scale of 0-10, where 0 = "better than", 5 = "equal to", and 10 = "worse than", the male players reported a negative overall impression (8.3, s = 0.2), poorer ball control (7.3, s = 0.3), and greater physical effort (7.2, s = 0.2) on artificial turf than natural grass. In conclusion, the running activities and technical standard were similar during games on artificial turf and natural grass. However, fewer sliding tackles and more short passes were performed during games on artificial turf. The observed change in playing style could partly explain the male players' negative impression of artificial turf.
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3.
  • Mascher, Henrik, et al. (författare)
  • Changes in signalling pathways regulating protein synthesis in human muscle in the recovery period after endurance exercise
  • 2007
  • Ingår i: Acta Physiologica. - Blackwel. - 1748-1708. ; 191:1, s. 67-75
  • Tidskriftsartikel (refereegranskat)abstract
    • AIM: Exercise induced alterations in the rate of muscle protein synthesis may be related to activity changes in signalling pathways involved in protein synthesis. The aim of the present study was to investigate whether such changes in enzyme phosphorylation occur after endurance exercise. METHODS: Six male subjects performed ergometer cycling exercise for 1 h at 75% of the maximal oxygen uptake. Muscle biopsy samples from the vastus lateralis were taken before, immediately after, 30 min, 1 h, 2 h and 3 h after exercise for the determination of protein kinase B (PKB/Akt), mammalian target of rapamycin (mTOR), glycogen synthase 3 kinase (GSK-3), p70S6 kinase (p70(S6k)) and eukaryotic elongation factor 2 (eEF2) phosphorylation. RESULTS: The phosphorylation of Akt was unchanged directly after exercise, but two- to fourfold increased 1 and 2 h after the exercise, whereas GSK-3alpha and beta phosphorylation were two- to fourfold elevated throughout most of the 3-h recovery period. Phosphorylation of mTOR was elevated threefold directly after, 30 min and 2 h after exercise and eEF2 phosphorylation was decreased by 35-75% from 30 min to 3 h-recovery. Exercise led to a five- to eightfold increase in Ser(424)/Thr(421) phosphorylation of p70(S6k) up to 30 min after exercise, but no change in Thr(389) phosphorylation. CONCLUSIONS: The marked decrease in eEF2 phosphorylation suggests an activation of translation elongation and possibly protein synthesis in the recovery period after sustained endurance exercise. The lack of p70(S6k) activation suggests that translation initiation is activated via alternative pathways, possibly via the activation of eukaryotic initiating factor 2B.
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4.
  • Mohr, Magni, et al. (författare)
  • Match activities of elite women soccer players at different performance levels
  • 2008
  • Ingår i: Journal of Strength and Conditioning Research. - Wolters Kluwer. - 1064-8011. ; 22:2, s. 341-349
  • Tidskriftsartikel (refereegranskat)abstract
    • We sought to study the physical demands and match performance of women soccer players. Nineteen top-class and 15 high-level players were individually videotaped in competitive matches, and time-motion analysis were performed. The players changed locomotor activity >1,300 times in a game corresponding to every ~4 seconds and covered 9-11 km in total. The top-class players ran 28% longer (P < 0.05) at high intensities than high-level players (1.68 +/- 0.09 and 1.33 +/- 0.10 km, respectively) and sprinted 24% longer (P < 0.05). The top-class group had a decrease (P < 0.05) of 25-57% in high intensity running in the final 15 minutes compared with the first four 15-minutes intervals, whereas the high-level group performed less (P < 0.05) high-intensity running in the last 15 minutes of each half in comparison with the 2 previous 15-minute periods in the respective half. Peak distance covered by high intensity running in a 5-minute interval was 33% longer (P < 0.05) for the top-class players than the high-level players. In the following 5 minutes immediately after the peak interval top-class players covered 17% less (P < 0.05) high-intensity running than the game average. Defenders performed fewer (P < 0.05) intervals of high-intensity running than midfielders and attackers, as well as fewer (P < 0.05) sprints than the attackers. In conclusion, for women soccer players (1) top-class international players perform more intervals of high-intensity running than elite players at a lower level, (2) fatigue develops temporarily during and towards the end of a game, and (3) defenders have lower work rates than midfielders and attackers. The difference in high-intensity running between the 2 levels demonstrates the importance of intense intermittent exercise for match performance in women soccer. Thus, these aspects should be trained intensively in women soccer.
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5.
  • Nilsson, Andreas, et al. (författare)
  • Comparison of equations for predicting energy expenditure from accelerometer counts in children
  • 2008
  • Ingår i: Scandinavian Journal of Medicine and Science in Sports. - Oxford : Blackwell. - 0905-7188. ; 18:5, s. 643-650
  • Tidskriftsartikel (refereegranskat)abstract
    • Several prediction equations developed to convert body movement measured by accelerometry into energy expenditure have been published. The aim of this study was to examine the degree of agreement between three different prediction equations, when applied to data on physical activity in a large sample of children. We examined 1321 children (663 boys, 658 girls; mean age 9.6+/-0.4 years) from four different countries. Physical activity was measured by the MTI accelerometer. One equation, derived from doubly labeled water (DLW) measurements, was compared with one treadmill-based (TM) and one room calorimeter-based (CAL) equation (mixture of activities). Predicted physical activity energy expenditure (PAEE) was the main outcome variable. In comparison with DLW-predicted PAEE, both laboratory-derived equations significantly (P<0.001) overestimated PAEE by 17% and 83%, respectively, when based on a 24-h prediction, while the TM equation significantly (P<0.001) underestimated PAEE by 46%, when based on awake time only. In contrast, the CAL equation agreed better with the DLW equation under the awake time assumption. Predicted PAEE differ substantially between equations, depending on time-frame assumptions, and interpretations of average levels of PAEE in children from available equations should be made with caution. Further development of equations applicable to free-living scenarios is needed.
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6.
  • Ortega, Francisco B., et al. (författare)
  • Cardiovascular fitness modifies the associations between physical activity and abdominal adiposity in children and adolescents : The European Youth Heart Study
  • 2008
  • Ingår i: British Journal of Sports Medicine. - London : BMJ Publishing Group Ltd. - 0306-3674. ; 44:4, s. 256-262
  • Tidskriftsartikel (refereegranskat)abstract
    • Objective To examine the associations between physical activity (PA) and abdominal adiposity, as measured by waist circumference, in children and adolescents, and to test whether cardiovascular fitness (CVF) modifies these associations.Methods PA components were measured by accelerometry in 1075 individuals aged 9 or 15 years old. CVF was measured by a maximal cycling test. Self-reported maternal educational level, body mass index, children's birth weight and television viewing were used as confounders.Results Linear regression did not show any association between the PA variables and waist circumference, after controlling for sex, age and height. When stratifying by CVF level (low/high), time spent at vigorous PA was inversely associated with waist circumference (p≤0.05) in the low CVF group. Unexpectedly, in the high CVF group, the PA variables were positively associated with waist circumference (p≤0.05). In both groups, the results were unchanged after controlling for the confounders. CVF was inversely associated with waist circumference, after controlling for all PA variables (p≤0.01) and confounders (p≤0.01).Conclusion CVF is inversely associated with abdominal adiposity and seems to modify the associations between PA and abdominal adiposity. In low-fit children and adolescents, time spent in vigorous PA seems to be the key component linked to abdominal adiposity. This finding should be considered in further development of lifestyle intervention strategies. The results found in the high-fit group need to be confirmed.
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7.
  • Quennerstedt, Mikael (författare)
  • Hälsa eller inte hälsa – är det frågan?
  • 2007
  • Ingår i: Utbildning och Demokrati. - Örebro : Örebro universitet. - 1102-6472. ; 16:2, s. 37-56
  • Tidskriftsartikel (refereegranskat)abstract
    • Health or not – is that the question? In relation to an international debate as well as an upcoming revision of the syllabi of Physical Education in Sweden, this article discusses the question, whether physical education should consider a limited or an increased commitment towards the goals of public health and a health agenda. With a point of departure in a salutogenic approach the article hopefully adds richness to the perspective of health in physical education. In this way the article contributes to the discussion about health issues in physical education, and whether physical education can be a part of a sustainable health development.
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8.
  •  
9.
  • Bäckström, Åsa, 1966- (författare)
  • Idrottsliga inkräktare : Recension av Bolin & Granskog (2003) Athletic intruders:  ethnographic research on women, culture, and exercise
  • 2011
  • Ingår i: idrottsforum.org. - 1652-7224.
  • Recension (övrigt vetenskapligt)abstract
    • En djupdykning i SUNY-förlagets backlist har ådagalagt tre angelägna titlar som inte tidigare kommit med i forumets recensionsverksamhet men som trots att de fått några år på nacken av tjänstgörande recensionsredaktör bedömts som angelägna att lyfta fram. I november 2010 recenserade Ingela Kolfjord Mike Messners Out of Play, (2007), och Pirkko Markulas antologi Feminist Sport Studies från 2005 recenseras av Helena Tolvhed på annan plats i denna uppdatering. Äldst av de tre var antologin Athletic Intruders: Ethnographic Research on Women, Culture, and Exercise från 2003, med Anne Bolin och Jane Granskog som redaktörer (State University of New York Press). Vi applåderar SUNY Press för en föredömlig lagerhållningsstrategi (möjlig tack vare print on demand-tekniken), och gläds åt att vi hittade totalt rätt i val av recensent, nämligen Åsa Bäckström, som just då var redo att läsa just denna bok. I en föredömligt välskriven, initierad och intresseväckande recension ser hon bortom de lite ålderstigna referenserna och diskuterar metod, empiri och, inte minst, feminismens historia.
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10.
  • Larsson, Håkan, et al. (författare)
  • Swedish physical education research
  • 2008
  • Ingår i: Physical Education and Sport Pedagogy. - Abingdon, Oxfordshire : Routledge. - 1740-8989. ; 13:4, s. 295-302
  • Tidskriftsartikel (refereegranskat)abstract
    • This article does not have an abstract.
  •  
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