Är den tillämpade idrottsforskningen könsneutral? : Fallstudie på en tidskrifts publikationer

Syfte Mötet mellan kroppen som något socialt format och som något biologiskt mätbart som sker i idrott kan vara problematiskt vilket visat sig genom tidigare forskning inom området. Olika sätt att se på kön kan göra att biologisk jämlikhet mellan män och kvinnor förutsätts där det finns skillnader eller att skillnader förutsätts där det inte finns några. Syftet med denna studie var att genom en systematisk litteraturgranskning belysa det tillämpade idrottsvetenskapliga forskningsfältets urval av försökspersoner och rapportering av dessa. Samt utifrån teorier kring kön och genus tolka resultatet av detta. Vidare var syftet att undersöka effekten av förstaförfattarens könskategori på val av urvalsgrupper och rapportering av dessa. Studien tar bland annat sin utgångspunkt i Hirdmans formler för förhållandet mellan man och kvinna för att analysera de resultat som fås. Tas både kulturella och biologiska aspekter på kroppen i beaktning i den idrottsvetenskapliga forskning som sker som sedan skall tillämpas i praktiken? Metod Genom en fallstudie av en idrottsvetenskaplig tidskrift som publicerar studier inom den tillämpade idrottsvetenskapliga forskningen kodades dess publicerade artiklar. Totalt kodades 291 artiklar som hörde till original investigations, case studies och technical reports. Särskild vikt lades vid de kodade artiklarnas sammanfattning och urval av försökspersoner varför titel, sammanfattning, sökord och könskategori på förstaförfattare kodades. Även könsfördelning på försökspersonerna i urvalsgruppen och totalt antal försökspersoner kodades.  Resultat I häften av alla artiklar gick könsfördelning inte att utläsa i sammanfattning. Totalt identifierades 8643 försökspersoner varav 4191 var av manligt kön, 1440 av kvinnligt kön och 3012 gick inte att koda till en könskategori. Fler än 50 % av artiklarna identifierades med ett urval av enbart män, 6 % med ett urval av enbart kvinnor, 21 % blandat urval och resterande gick inte att koda. I 84 % av fallen identifierades förstaförfattare som man. Slutsats Vid en första anblick av en artikel kan det vara svårt att bilda sig en uppfattning kring könsfördelning på studiens urvalsgrupp. Urvalsgrupperna är inte jämnt fördelade mellan kvinnor och män. En skev rekrytering av urvalet kan ge upphov till att den idrottsvetenskapliga forskningen speglar idrottens premisser att det är en manlig arena. På detta sätt riskerar den att reproducera den manliga normen inom idrotten genom att påverka framtida forskning eller idrottsutbildningar.

The importance of body-mass exponent optimization for evaluation of performance capability in cross-country skiing

Introduction Performance in cross-country skiing is influenced by the skier’s ability to continuously produce propelling forces and force magnitude in relation to the net external forces. A surrogate indicator of the “power supply” in cross-country skiing would be a physiological variable that reflects an important performance-related capability, whereas the body mass itself is an indicator of the “power demand” experienced by the skier. To adequately evaluate an elite skier’s performance capability, it is essential to establish the optimal ratio between the physiological variable and body mass. The overall aim of this doctoral thesis was to investigate the importance of body-mass exponent optimization for the evaluation of performance capability in cross-country skiing. Methods In total, 83 elite cross-country skiers (56 men and 27 women) volunteered to participate in the four studies. The physiological variables of maximal oxygen uptake (V̇O2max) and oxygen uptake corresponding to a blood-lactate concentration of 4 mmol∙l-1 (V̇O2obla) were determined while treadmill roller skiing using the diagonal-stride technique; mean oxygen uptake (V̇O2dp) and upper-body power output (Ẇ) were determined during double-poling tests using a ski-ergometer. Competitive performance data for elite male skiers were collected from two 15-km classical-technique skiing competitions and a 1.25-km sprint prologue; additionally, a 2-km double-poling roller-skiing time trial using the double-poling technique was used as an indicator of upper-body performance capability among elite male and female junior skiers. Power-function modelling was used to explain the race and time-trial speeds based on the physiological variables and body mass. Results The optimal V̇O2max-to-mass ratios to explain 15-km race speed were V̇O2max divided by body mass raised to the 0.48 and 0.53 power, and these models explained 68% and 69% of the variance in mean skiing speed, respectively; moreover, the 95% confidence intervals (CI) for the body-mass exponents did not include either 0 or 1. For the modelling of race speed in the sprint prologue, body mass failed to contribute to the models based on V̇O2max, V̇O2obla, and V̇O2dp. The upper-body power output-to-body mass ratio that optimally explained time-trial speed was Ẇ ∙ m-0.57 and the model explained 63% of the variance in speed. Conclusions The results in this thesis suggest that V̇O2max divided by the square root of body mass should be used as an indicator of performance in 15-km classical-technique races among elite male skiers rather than the absolute or simple ratio-standard scaled expression. To optimally explain an elite male skier’s performance capability in sprint prologues, power-function models based on oxygen-uptake variables expressed absolutely are recommended. Moreover, to evaluate elite junior skiers’ performance capabilities in 2-km double-poling roller-skiing time trials, it is recommended that Ẇ divided by the square root of body mass should be used rather than absolute or simple ratio-standard scaled expression of power output.

Physiological demands of competitive elite cross-country skiing

Introduction Researchers have, for decades, contributed to an increased collective understanding of the physiological demands in cross-country skiing; however, almost all of these studies have used either non-elite subjects and/or performances that emulate cross-country skiing. To establish the physiological demands of cross-country skiing, it is important to relate the investigated physiological variables to the competitive performance of elite skiers. The overall aim of this doctoral thesis was, therefore, to investigate the external validity of physiological test variables to determine the physiological demands in competitive elite cross-country skiing. Methods The subjects in Study I – IV were elite male (I – III) and female (III – IV) cross-country skiers. In all studies, the relationship between test variables (general and ski-specific) and competitive performances (i.e. the results from competitions or the overall ski-ranking points of the International Ski Federation (FIS) for sprint (FISsprint) and distance (FISdist) races) were analysed. Test variables reflecting the subject’s general strength, upper-body and whole-body oxygen uptake, oxygen uptake and work intensity at the lactate threshold, mean upper-body power, lean mass, and maximal double-poling speed were investigated. Results The ability to maintain a high work rate without accumulating lactate is an indicator of distance performance, independent of sex (I, IV). Independent of sex, high oxygen uptake in whole-body and upper-body exercise was important for both sprint (II, IV) and distance (I, IV) performance. The maximal double-poling speed and 60-s double-poling mean power output were indicators of sprint (IV) and distance performance (I), respectively. Lean mass was correlated with distance performance for women (III), whereas correlations were found between lean mass and sprint performance among both male and female skiers (III). Moreover, no correlations between distance performance and test variables were derived from tests of knee-extension peak torque, vertical jumps, or double poling on a ski-ergometer with 20-s and 360-s durations (I), whereas gross efficiency while treadmill roller skiing showed no correlation with either distance or sprint performance in cross-country skiing (IV). Conclusion The results in this thesis show that, depending on discipline and sex, maximal and peak oxygen uptake, work intensity at the lactate threshold, lean mass, double-poling mean power output, and double-poling maximal speed are all externally valid physiological test variables for evaluation of performance capability among elite cross-country skiers; however, to optimally indicate performance capability different test-variable expressions should be used; in general, the absolute expression appears to be a better indicator of competitive sprint performance whereas the influence of body mass should be considered when evaluating competitive distance performance capability of elite cross-country skiers.

Optimal V. O2max-to-mass ratio for predicting 15 km performance among elite male cross-country skiers

The aim of this study was 1) to validate the 0.5 body-mass exponent for maximal oxygen uptake (V. O2max) as the optimal predictor of performance in a 15 km classical-technique skiing competition among elite male cross-country skiers and 2) to evaluate the influence of distance covered on the body-mass exponent for V. O2max among elite male skiers. Twenty-four elite male skiers (age: 21.4±3.3 years [mean ± standard deviation]) completed an incremental treadmill roller-skiing test to determine their V. O2max. Performance data were collected from a 15 km classicaltechnique cross-country skiing competition performed on a 5 km course. Power-function modeling (ie, an allometric scaling approach) was used to establish the optimal body-mass exponent for V . O2max to predict the skiing performance. The optimal power-function models were found to be race speed = 8.83⋅(V . O2max m-0.53) 0.66 and lap speed = 5.89⋅(V . O2max m-(0.49+0.018lap)) 0.43e0.010age, which explained 69% and 81% of the variance in skiing speed, respectively. All the variables contributed to the models. Based on the validation results, it may be recommended that V. O2max divided by the square root of body mass (mL⋅min−1 ⋅kg−0.5) should be used when elite male skiers’ performance capability in 15 km classical-technique races is evaluated. Moreover, the body-mass exponent for V . O2max was demonstrated to be influenced by the distance covered, indicating that heavier skiers have a more pronounced positive pacing profile (ie, race speed gradually decreasing throughout the race) compared to that of lighter skiers.

The influence of sex, age, and race experience on pacing profiles during the 90 km Vasaloppet ski race

The purpose of this study was to investigate pacing-profile differences during the 90 km Vasaloppet ski race related to the categories of sex, age, and race experience. Skiing times from eight sections (S1 to S8) were analyzed. For each of the three categories, 400 pairs of skiers were matched to have a finish time within 60 seconds, the same start group, and an assignment to the same group for the other two categories. Paired-samples Student’s t-tests were used to investigate sectional pacing-profile differences between the subgroups. Results showed that males skied faster in S2 (P=0.0042), S3 (P=0.0049), S4 (P=0.010), and S1–S4 (P<0.001), whereas females skied faster in S6 (P<0.001), S7 (P<0.001), S8 (P=0.0088), and S5–S8 (P<0.001). For the age category, old subjects (40 to 59 years) skied faster than young subjects (19 to 39 years) in S3 (P=0.0029), and for the other sections, there were no differences. Experienced subjects (≥4 Vasaloppet ski race completions) skied faster in S1 (P<0.001) and S1–S4 (P=0.0054); inexperienced skiers (<4 Vasaloppet ski race completions) had a shorter mean skiing time in S5–S8 (P=0.0063). In conclusion, females had a more even pacing profile than that of males with the same finish time, start group, age, and race experience. No clear age-related pacing-profile difference was identified for the matched subgroups. Moreover, experienced skiers skied faster in the first half whereas inexperienced skiers had higher skiing speeds during the second half of the race.

En teorispäckad sociologisk analys av fritid och sport – ett ambitiöst projekt : recension av boken Leisure, Sports & Society av Karl Spracklen

I september 2014 bytte Leeds Metropolitan University, trots studentprotester, namn till Leeds Beckett University; universitetets första colleges låg i Beckett Park, vilken i sin tur fått namn efter bankiren och konservative parlamentsledamoten Ernest Beckett, 2nd Baron Grimthorpe (1856–1917), vars alma mater faktiskt var Trinity College, Cambridge. Leeds-studenternas motstånd hade sin grund i att namnändringen beräknades kosta en kvarts miljon pund, alltmedan inte minst universitetets idrottsanläggningar tillåtits förfalla. Vi vet inte hur universitetets personal ställde sig till namnförändringen, och särskilt nyfikna är vi ju på vad professorn i Leisure Studies (fritidsforskning, fritidsvetenskap) vid Leeds Beckett University, Karl Spracklen, tyckte om förändringen. Detta är dock blott "idle curiosity"; Spracklen är aktuell av ett helt annat, och viktigare, skäl, nämligen för sin bok Leisure, Sports & Society (Palgrave Macmillan). Spracklen, som är sociolog och vars forskningsintresse också inkluderar "metal music" (som sekreterare för International Society for Metal Music Studies och redaktör för Metal Music Studies) och "whiskey tourism" (som drivande i British Sociological Associations Alcohol Study Group) är en centralfigur inom det brittiska fritidsforskningsetablissemanget – han har bland annat varit ordförande i viktiga LSA, Leisure Studies Association från 2009 till 2013. Han har därtill en lång rad publikationer bakom sig, böcker, antologibidrag och vetenskapliga artiklar inom idrotts- och fritidsforskning i vid mening. Den nya boken ges här en grundlig recension av Erik Backman, som ju vet ett och annat om fritidsforskning, Spracklen bottnar teoretiskt i Habermas, i sig ovanligt bland brittiska forskare, men också i Marx, Weber och Bourdieu, bland andra, i sin utforskning av sambandet mellan fritid, fysisk aktivitet och sport ur ett tvärvetenskapligt perspektiv som innefattar idrottsvetenskap, sociologi, cultural studies, historia, filosofi och psykologi. Och vår recensent är imponerad över bredden, djupet och ambitionsnivån – även om det kan bli lite tjatigt från och till.

Running economy and blood lactate accumulation in elite football players with high and low maximal aerobic power

The purpose was to determine running economy and lactate threshold among a selection of male elite football players with high and low aerobic power. Forty male elite football players from the highest Swedish division (“Allsvenskan”) participated in the study. In a test of running economy (RE) and blood lactate accumulation the participants ran four minutes each at 10, 12, 14, and 16 km•h-1 at horizontal level with one minute rest in between each four minutes interval. After the last sub-maximal speed level the participants got two minutes of rest before test of maximal oxygen uptake (VO2max). Players that had a maximal oxygen uptake lower than the average for the total population of 57.0 mL O2•kg-1•minute-1 were assigned to the low aerobic power group (LAP) (n=17). The players that had a VO2max equal to or higher than 57.0 mL O2•kg-1•minute-1 were selected for the high aerobic power group (HAP) (n=23). The VO2max was significantly different between the HAP and LAP group. The average RE, measured as oxygen uptake at 12, 14 and 16km•h-1 was significantly lower but the blood lactate concentration was significantly higher at 14 and 16 km•h-1 for theLAP group compared with the HAP group.

What would physical educators know about movement education? A review of literature, 2006-2016

This review paper identifies the conceptual underpinnings of current movement research in Physical Education. Using a hermeneutic approach, four analogies for movement education are identified: the motor program analogy, the neurobiological systems analogy, the instinctive movement analogy, and the embodied exploration analogy. Three issues related to logical consistency and its relevance for movement education are raised. The first relates to tensions between the analogies and educational policy. The second concerns differences among the four analogies. The third issue relates to the appropriateness of specific analogies for dealing with certain movement contexts. In each case, strategies for improvement are considered. The paper is concluded with a brief summary along with reflections on issues that require further attention.

Aerobic power and lean mass are indicators of competitive sprint performance among elite female cross-country skiers

The purpose of this study was to establish the optimal allometric models to predict International Ski Federation’s ski-ranking points for sprint competitions (FISsprint) among elite female cross-country skiers based on maximal oxygen uptake (V̇O2max) and lean mass (LM). Ten elite female cross-country skiers (age: 24.5±2.8 years [mean ± SD]) completed a treadmill roller-skiing test to determine V̇O2max (ie, aerobic power) using the diagonal stride technique, whereas LM (ie, a surrogate indicator of anaerobic capacity) was determined by dual-emission X-ray anthropometry. The subjects’ FISsprint were used as competitive performance measures. Power function modeling was used to predict the skiers’ FISsprint based on V̇O2max, LM, and body mass. The subjects’ test and performance data were as follows: V̇O2max, 4.0±0.3 L min-1; LM, 48.9±4.4 kg; body mass, 64.0±5.2 kg; and FISsprint, 116.4±59.6 points. The following power function models were established for the prediction of FISsprint: 3.91×105 ∙ VO -6.002maxand 6.95×1010 ∙ LM-5.25; these models explained 66% (P=0.0043) and 52% (P=0.019), respectively, of the variance in the FISsprint. Body mass failed to contribute to both models; hence, the models are based on V̇O2max and LM expressed absolutely. The results demonstrate that the physiological variables that reflect aerobic power and anaerobic capacity are important indicators of competitive sprint performance among elite female skiers. To accurately indicate performance capability among elite female skiers, the presented power function models should be used. Skiers whose V̇O2max differs by 1% will differ in their FISsprint by 5.8%, whereas the corresponding 1% difference in LM is related to an FISsprint difference of 5.1%, where both differences are in favor of the skier with higher V̇O2max or LM. It is recommended that coaches use the absolute expression of these variables to monitor skiers’ performance-related training adaptations linked to changes in aerobic power and anaerobic capacity.