The purpose of this study was to investigate the effect of same-day strength training on bat swing velocity of male collegiate baseball players. Sixteen male baseball players engaged in a preseason strength training program designed by the team's strength and conditioning coach. All subjects were tested for bat swing peak velocity immediately prior to ball impact for a non lifting day (NLD) by recording 10 swings with 30 seconds of rest in between swings. The next day, a lifting day (LD), all subjects tested on the NLD were tested four to six hours after the morning lifting session with the same amount of swings and rest. Six Vicon MX13+ infrared cameras (Vicon-Colorado, Centennial, Colorado), running at 400 Hz, were placed around the swinging area using Nexus 1.2 imaging software to download and determine bat swing peak velocity immediately prior to ball impact. The average of the top six bat swing peak velocity test results, for each subject, was compared to measures taken on the NLD and LD. A matched t-test revealed a significant difference in bat swing peak velocity between a NLD and a LD. A mean bat swing difference between NLD (69.18) and LD (70.86) of 1.68 was statistically different at better than the .05 level [p =.021]. This study suggests that male collegiate baseball players should be able to engage in a designed strength training program with a positive effect, and without any negative effect, on bat swing peak velocity when a strength training session is scheduled on the same day as a baseball competition.

Inom kroppsbyggning anses ökning av skelettmuskulatur vara av primär betydelse.Flertalet styrketräningsmetoder för skelettmuskel-hypertrofi existerar, men ingenentydig bild över dessa metoders effekt på amplitud av skelettmuskel-hypertrofiexisterar.Denna litteraturstudie syftar till att undersöka om det finns en skillnad mellan olikastyrketräningsmodellers förmåga att generera en ökad skelettmuskulatur.För att besvara syftet har 10 stycken RCT-studier rörande olika tänkbara parametrarbakom skelettmuskel-hypertrofi analyserats och sammanställts. Ett flertalstyrketränings-parametrar och träningsmetoder har analyserats, liksom dess magnitud påskelettmuskel-hypertrofi. Litteraturstudiens resultat visar att trots att alternativaträningsmetoder uppvisar likvärdiga, och i vissa fall även bättre, resultat rörandeskelettmuskel-hypertrofi relativt traditionell styrketräning, saknas någon entydig metodsom är överlägsen övriga styrketräningsmetoder. Litteraturstudiens resultat indikerar attnågon på förhand given optimal kombination av set, repetitioner och intensitet förskelettmuskel-hypertrofi sannolikt inte existerar. Detta då litteraturstudiens resultat visaratt det är metabola och systemiska intracellulära processer som orsakar skelettmuskelhypertrofi.Att intracellulära metabola och systemiska signaler styr skelettmuskelhypertrofi,samt att dessa signaler är oberoende av produkten av set, repetitioner ochintensitet, medför att kombinationer av set, repetitioner och intensitet sannolikt endast ären konsekvens och inte en orsak bakom skelettmuskel-hypertrofi. / In bodybuilding, increasing skeletal muscle is considered to be of primary importance.Several strength training methods for skeletal muscle hypertrophy exist, but no clearpicture of the effect of these methods on the amplitude of skeletal muscle hypertrophyexists.This literature study aims to investigate whether there is a difference between differentstrength training model’s ability to generate increased skeletal muscle mass.To answer the purpose, 10 RCT studies concerning various conceivable parametersbehind skeletal muscle hypertrophy have been analyzed and compiled. Several strengthtraining parameters and training methods have been analyzed, as well as it’s magnitudeon skeletal muscle hypertrophy. The results of the literature study show that althoughalternative training methods show equivalent, and in some cases even better, resultsregarding skeletal muscle hypertrophy compared to traditional strength training, there isno clear method that is superior to other strength training methods. The results of theliterature study indicate that an optimal combination of sets, repetitions and intensity forskeletal muscle hypertrophy probably does not exist. This as the results of the literaturestudy show that it is metabolic and systemic intracellular processes that cause skeletalmuscle hypertrophy. That intracellular metabolic and systemic signals control skeletalmuscle hypertrophy, and that these signals are independent of the product of sets,repetitions and intensity, means that combinations of sets, repetitions and intensity arelikely only a consequence and not a cause behind skeletal muscle hypertrophy.

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