ABSTRACT  Title of dissertation: Analysis and comparasion of squat exercise due to surface EMG  Objectives of dissertation: To measure and describe the structure involving specific muscles durring back squat, front squat and smith machine squat exercise.  Method: Surface EMG analysis and simple kinematic analysis.  Results: Activation of m. gluteus maximus was highest after the start of excentric movement. Main muscle working on the chase between the concentric and excentric movement was m. rectus femoris. Very similar timing and synergy were between m. erector spinae and m. biceps femoris. In this study was not higher activation of m. quadriceps femoris during front squat exercise, activation of m. gluteus maximus were also higher.  Key words: squat, strengthening, bar, front squat, back squat, Smith machine squat, bodybuilding, weightlifting, powerlifting, EMG analysis, kinematic analysis 6

Creatine is nitrogen-containing organic acid which naturally occurs in the human body. The aim of this work was to determine the optimal dose of creatine in combination with vitamin C and magnesium for male respondents aged 18-26 years. They were divided into two groups differing in the creatine dosage. Group 1 took smaller dose of creatine (3 g per day) and group 2 higher dose of creatine (10 g per day). Both groups took both magnesium and vitamin C at constant doses throughout the study. The effects of significantly different dose of creatine in the individual groups were compared with each other in terms of the performance of individuals in the powerlifting, the anthropological changes and the overal metabolism of the intakes. In all disciplines of powerlifting, group 1 recorded higher average weight gains, which were not found to be statistically significant at a significance level of alpha 0,05. Anthropological changes were measured using the InBody 160 and a diagnostic measuring tape. In both cases, group 1 recorded better results than group 2, but these results were not statistically significant at a significance level of alpha 0,05. The total metabolism of the accepted dietary supplements was investigated through analytical methods. The urine of each respondent was regularly collected and subsequently analyzed during the research. Determination of creatinine, a creatine waste product, was performed by UV-VIS spectrophotometry using the Jaffe reaction. Vitamin C was analyzed by RP-HPLC. Magnesium was determined by the ICP-OES method. After creatine suplemantion of 3 per day, group 1 showed a slight increase in creatinine in the urine, but still in the physiological range. At the significance level alpha 0,05 there was no statistically significant difference. Group 2 showed an increase above the physiological limit which was already a statistically significant difference. Overall, creatine supplementation of 3 g per day has been found as a sufficient intake of creatine needed to build up muscle mass, increase energy metabolism and overall physical performance. The metabolization itself works very well and within the physiological values.

Syftet med studien är att undersöka ifall det finns något samband mellan emotionell koppling till de sociala medieplattformarna Facebook, Instagram och TikTok och upplevdidrottsmotivation hos svenska styrkelyftare och bänkpressare. Samt ifall det finns några skillnader mellan könskategorier och tävlingsnivåer. Totalt deltog 93 personer (15-59 år) i studien varav 59 tävlande i kategori kvinna och 34 i kategori man. 32 deltagare tävlade på distriktsnivå, 38 på nationell nivå och 23 på internationell nivå. Data samlades in med hjälp av en webbenkät som i huvudsak baserades på de två befintliga frågeformulären Sport motivation scale-II (SMS-II) och The Multidimensional Facebook Intensity Scale (MFIS). Pearsons korrelationsanalys visade endast ett signifikant samband för TikTok ( p < .01) där en positiv korrelation fanns. Även bivariata regressionsanalyser visade endast ett signifikant resultat för TikTok (p < .01 & p < .001) som visade att en starkare koppling till plattformen kunde förutsäga en högre nivå av upplevd idrottsmotivation. Kovariansanalyser (ANCOVA) visade inga skillnader i emotionell koppling till plattformarna eller i upplevd idrottsmotivation mellan könskategorierna och tävlingsnivåerna. I denna studie upptäcktes positiva samband mellan emotionell koppling till sociala medier och upplevd idrottsmotivation och tidigare forskning har visat på både positiva och negativa effekter av sociala medier på idrottares motivation.Detta är något som kan vara relevant för idrottare, tränare och andra aktörer i idrottares närhet att vara medvetna om. / The aim of the study is to examine if there is a relation between the emotional connectednessto the social media platforms Facebook, Instagram and Tikok and the degree of perceived sports motivation in Swedish powerlifters and bench-press competitors. And if there are differences between gender categories and competition levels. In total the study had 93 participants (age 15-59) 59 competed in the women’s category and 34 in the men’s category. 32 participants competed at the regional level, 38 at the national level and 23 at the international level. Data was collected via an online questionnaire which was mainly based on the Sport motivation scale-II (SMS-II) and The Multidimensional Facebook Intensity Scale (MFIS). Pearson’s correlation test did only show a significant relation for TikTok ( p < .01) which showed a positive correlation. The same was the case for the bivariate regression analysis where also only a significant result for TikTok was found (p < .01 & p < .001) which showed that a strong emotional connectedness to TikTok could predict a high level of perceived sportsmotivation. Analysis of Covariance (ANCOVA) showed no differences in emotional connectedness to the social media platforms or in perceived sports motivation between the gender categories and competition levels. This study showed a positive relation between emotional connectedness to social media and perceived sports motivation and previous research has shown both positive and negative effects of social media on sports motivation. This can be of relevance for the athletes themselves but also for coaches and other actors close to the athletes to be aware of.

Kroppsuppfattning påverkar vår livskvalitet. Utöver att prestera på tävling behöver tyngdlyftare och styrkelyftare delta på en invägning, där deras kroppsvikt avgör vilken viktklass de tävlar i. Syftet med studien var att undersöka om det fanns ett samband mellan lyftares kroppsuppfattning och upplevelse av att vara aktiv och tävlande inom tyngdlyftning och/eller styrkelyft. Metod: 210 svenska tyngdlyftare och styrkelyftare med tävlingserfarenhet i åldrarna 15–70 år deltog i studien. Deltagarna svarade på en digital enkät som inkluderade ett av författaren nyskapat instrument om förekomst av beteenden och upplevelser av att tävla i en viktklassidrott, samt Body Esteem Scale for Adolescents and Adults om kroppsuppfattning. Resultat: Signifikant positiva korrelationer av måttlig styrka påvisades mellan kroppsuppfattning och tävlingsupplevelse, samt mellan kroppsuppfattning och viktupplevelse. Svag positiv korrelation påvisades mellan kroppsuppfattning och invägningsupplevelse. 60 % av studiedeltagarna rapporterade positiv kroppsuppfattning och 40 % rapporterade blandad/splittrad eller negativ kroppsuppfattning. Slutsats: Studiens resultat indikerar att kroppsuppfattning och upplevelse av att tävla, upplevelse av sin kroppsvikt och att tävla i viktklass(er), samt upplevelse av invägning har ett samband. Då 40 % av populationen rapporterade blandad/splittrad eller negativ kroppsuppfattning tyder resultaten på praktiska förbättringsmöjligheter där idrottares kroppsuppfattning kan förbättras. / Body image affects our quality of life. In addition to performing in competition, weightlifters and powerlifters need to participate in a weigh-in, where their body weight determines which weight class they compete in. The purpose of the study was to investigate whether there was a relationship between lifters’ body image and experience of being active and competing in weightlifting and/or powerlifting. Method: 210 Swedish weightlifters and powerlifters with competition experience aged 15–70 years participated in the study. The participants responded to a digital questionnaire that included an instrument newly created by the author on the prevalence of behaviours and experiences of competing in a weight class sport, as well as the Body Esteem Scale for Adolescents and Adults. Results: Positive correlations of statistical significance and of moderate strength were found between body image and competition experience, as well as between body image and weight experience. Weak positive correlation was demonstrated between body image and weigh-in experience. 60 % of the participants reported positive body image and 40 % reported mixed/split or negative body image. Conclusion: The results of the study indicate a relationship between body image and experience of competing, experience of one's body weight and competing in weight class(es), as well as experience of weigh-ins. As 40 % of the population reported mixed/split or negative body image, the results indicate practical opportunities where athletes’ body image can be improved.