No description available.

Aim: The purpose of this study was to evaluate the relationship between weightlifting performance (snatch, clean and jerk, and total) and variables obtained from the isometric mid-thigh pull (IMTP). Methods: Twelve weightlifters, ranging from novice to advanced, performed the IMTP 10 days after a competition. Correlations were used to evaluate relationships between variables of the IMTP and absolute and scaled competition results. Results: Unscaled competition results correlated strongly with IRFD (0-200ms: r=0.567-0.645, 0-250ms: r=0.722-0.781) while results correlated weakly with Peak IRFD (5ms window, r=0.360-0.426). Absolute peak force values correlated very strongly with absolute values for the competition performance (r=0.830-0.838). Force at 100ms, 150ms, 200ms and 250ms also correlated strongly with competition results (r=0.643-0.647, r=0.605-0.636, r=0.714-0.732, r=0.801-0.804). Similar findings were noted for allometrically scaled values. Conclusion: Measures of average IRFD probably represent a more relevant variable to dynamic performance than does Peak IRFD (5ms). Maximum isometric strength also is likely to have a strong role in weightlifting performance.

No description available.

Objectives: The purpose of the study was to identify the level of accuracy in velocity measurement from a newly developed inertia sensor.Design and Methods: Five subjects performed two dumbbell exercises for total of four sets of ten repetitions with a light intensity. Velocity data were taken and considered for analysis from two devices; the inertia sensor, wirelessly connected via Bluetooth™ to a smartphone, and a motion capture system. Both data were taken at the sampling frequency of 200 Hz. Identical data sets of peak and average velocity were analyzed with Pearson product-moment zero-order correlation using total 200 data points (5 subjects, 4 sets, and 10 repetitions) on both exercises with p value of 0.05. Data were also analyzed using the same statistical procedure for left and right side to ensure the device-device data consistency. Results: Results showed high correlations in both exercises between the two velocity measurement methods (0.80 - 0.92), indicating the accuracy of the data from the inertia sensor is supportive. Left and right side correlations were also high from the inertia sensor (0.90 - 0.93) indicating that the data were similar with relatively identical movements between the two limbs.Conclusions: With the accuracy of the velocity measurement, this would potentially replace currently used, wired devices to accommodate user-friendly, accessible to more exercises to measure velocity. (Journal of Trainology 2015;4:15-18)

abstract: Sedentary behavior and excessive weight gain have been proven to deteriorate many characteristics of muscle. Low muscular power and mass with excess fat mass are risk factors for a multitude of chronic conditions and functional disabilities. Resistance training (RT) has long been accepted as a rehabilitative method of maintaining or enhancing muscular performance and composition. There are various methods of determining lower extremity muscular power; however, isokinetic dynamometry has emerged as one of the most accurate and reliable methods in clinical and research settings. Likewise, various methods exist for determining muscle thickness; however, many of those methods are expensive and can expose individuals to radiation. Ultrasonography has emerged as an accurate and reliable alternative to measuring lower extremity muscle thickness. The objective of this study was to assess the effects of high-load/low-volume (HLLV) and low-load/high-volume (LLHV) RT on isokinetic knee extensor and flexor peak power in sedentary, RT naïve, overweight or obese men and women (Body Mass Index ≥ 25 kg/m2). Twenty-one subjects (n = 21) completed this study and were randomized into one of the following groups: control, a HLLV group that performed three sets of 5 repetitions for all exercises until volitional fatigue, and LLHV which performed three sets of 15 repetitions for all exercises until volitional fatigue. Subjects randomized to the RT groups performed full-body exercises routines on three non-consecutive days per week. Changes in isokinetic knee extensor and flexor peak power, quadriceps ultrasound muscle thickness, and right leg segment of dual-energy X-ray absorptiometry (DEXA) scans were measured before and after the 12-week RT intervention. There were no significant differences found in group, time or, group by time interactions for knee extensor and flexor peak power using isokinetic dynamometry. Other than a group interaction for vastus intermedius muscle thickness (P=0.008), no significant interactions or differences were observed for any of the other variables tested. Based on the results of this study, neither high- nor low-load RT resulted in significant differences between intervention groups in peak power of the knee extensors and flexor, muscle thickness changes of the vastus intermedius, and vastus lateralis and, in the right lower extremity segmented body composition measures using DEXA. / Dissertation/Thesis / Masters Thesis Exercise and Wellness 2020

The purpose of this study is to determine the effectiveness of an in-season resistance training program on improving measures of strength in female collegiate triathletes. Nine females (age = 19.2 ± 1.1 years, height = 166.5 ± 12.5 cm, body mass = 61.1 ± 9 kg) with limited resistance training experience were examined for this study. Formal RT intervention was monitored for 7 weeks with the athletes being assigned 6 weeks of independent RT prior to the pre-test. Athletes completed a standardized athlete monitoring program pre and post resistance training intervention. Paired sample t-tests were used to determine differences between conditions with Cohen’s d effect sizes describing the magnitude of change between pre and post-intervention. No significant changes were found between the two testing sessions (p > 0.05). A longer duration of utilizing resistance training adhering to a phase potentiated approach may be necessary for significant changes to occur.

Muskelstyrka är av stort värde för att bibehålla god hållning och aktivitetsnivå i såväl dagliga livet som i idrottssammanhang. Styrketräning har visats vara ett utmärkt sätt att uppnå styrka. De gamla teorierna om hur man på bästa sätt bedriver styrketräning har på senare år utmanats av studier som visar att man kan uppnå likvärdiga resultat med lågintensiv styrketräning till utmattning som med högintensiv sådan. Dessa studier har dock begränsats till otränade individer. Syfte: Att belysa hur intensiteten påverkar muskelstyrkan hos tränade individer. Metod: Litteratursökning i PubMed, SportsDiscus and Cinahl. Sju artiklar inkluderades genom granskning enligt PEDro scale. Resultat: Resultaten av denna review är ofullständiga till följd av begränsad statistisk power för styrkeökning i de inkluderade artiklarna. Ingen artikel undersökte en låg-intensitets interventionsgrupp. Det tycks föreligga en liten fördel för träning med belastning motsvarande 2 – 5 RM jämfört med 8 – 12 RM vid bänkpress. Slutsats: Det går inte utifrån denna litteraturstudie att dra några egentliga slutsatser om intensitetens betydelse för tränade individer, det behövs fler studier av god kvalitet. / Muscle strength is important to maintain a good posture and activity-level in sport as well as in daily life. Resistance training has been shown to be a good way to achieve that strength. The old theories of how to perform resistance training in an optimal way have recently been challenged by studies concluding that resistance training with low intensity to exhaustion or fatigue can give almost the same results as training with high intensity. However, these studies have been made on untrained subjects. Aim: The purpose of this review was to highlight the influence of intensity on muscle strength on trained subjects. Method: Literature search in PubMed, SportsDiscus and Cinahl. Seven articles were selected for reviewing using PEDro scale. Results: The results of this study are inconclusive due to lack of high statistical power for strength gain in included articles. None of the included articles had a real low intensity intervention. A small advantage can be seen for training with loads of 2 - 5 RM compared to 8 – 12 RM in bench press training. Conclusions: There are no direct conclusions to be drawn from this review, more studies of god quality are needed.

Title: Effects of minimal dose of resistance training on body composition and running performance in female recreational runners Objective: The purpose of this study was to analyse the extent to which minimal dose resistance training would elicit improvements in running performance and body composition for female recreational runners. Methods: Forty-one female recreational runners were randomly assigned to one of three groups (endurance running [V] n=14; combined endurance running and resistance training program once [VR30] n=14 and twice a week [VR60] n=13, respectively). During the 10-week training program, the V group completed 3 hours of continuous endurance running per week; VR30 completed 2 ½ hours of continuous endurance running and 1 x 30 min of resistance training per week, while VR60 group completed 2 hours of continuous endurance running and 2x30 min of resistance training per week. Body composition (FM, FFM, ECM/BCM), standing long jump, running economy, ventilatory anaerobic threshold and maximal endurance performance characteristics were assessed using ANOVA with repeated measures. Body composition was assessed via whole-body bio impedance. Performance parameters were determined during running on a treadmill. Results: Thirty-one female recreational runners completed 10-week...

Bakgrund: Subacromiell smärta är vanligt hos idrottare med repetitivt arbete ovan axelhöjd, vilket kan orsakas av obalans i muskulatur, förändrad position eller inskränkt rörlighet av scapula. Nedsatt funktion av scapula och dess stabilitet kan leda till minskad axelledsrörlighet och försvagad muskultur i området. Träning är förstahandsalternativet för minskad smärta, förbättrad funktion och ökad rörlighet vid subacromiell smärta. Behandling med scapulafokuserad träning har i dagsläget otillräcklig evidens. Mer studier behövs för att avgöra vilken nedsättning av scapula som den typ av träning påverkar och hur olika scapula fokuserade interventioner påverkar subacromiell smärta. Syfte: Syftet med studien var att undersöka effekten av kombinationsövningen ”shoulder dislocations” vad gäller scapulakontroll, aktiv utåtrotation i axelled och smärta hos crossfitutövare med subacromiell smärta. Metod: Single-subject metod med AB design användes till studien. Tre baslinjemätningar och fyra mätningar under interventionsfasen gjordes, där scapulakontrollen och aktiv utåtrotation i axeln mättes samt smärtskattning utfördes. Deltagarna var sin egen kontroll. Populationen var personer som tränade crossfit vid minst tre tillfällen per vecka med subacromiell smärta. Under interventionen utför deltagarna ”shoulder dislocation” tre gånger per vecka med doseringen tio repetitioner i tre set. Resultatet presenterades i grafer och analyserades visuellt. Resultat: Fyra deltagare inkluderades i studien varav en med bilaterala besvär. Samtliga deltagare förbättrade scapulakontrollen, fyra av fem deltagare förbättrade den aktiva utåtrotationen i axelled. Tre av fem deltagare upplevde minskad smärta under träning och vid mättillfället. Slutsats: ”Shoulder dislocation” tycks förbättra scapulakontrollen, aktiv utåtrotation i axelleden hos crossfitutövare med subacromiell smärta och tendens till minskad smärta. / Background: Subacromial pain is common among overhead athletes, which can lead to muscular imbalance, changed position or decreased mobility of scapula. Reduced function and stability of scapula could lead to decreased shoulder mobility and weakened musculature in the area. Exercise is first hand choice to reduce pain, improve function and increase range of motion at subacromial pain. Treatment with scapular focused exercise is today limited. More studies are needed to determine what kind of reduction of scapula this exercise influences and how different scapular focused interventions affect subacromial pain. Aim: The purpose of the study was to examine the effect of the combination exercise ”shoulder dislocations” in terms of scapula control, active external rotation in the glenohumeral joint and pain in crossfit athletes with subacromial pain. Method: Single-subject method with AB design was used in the study. Three baseline measurements and four measurements during the intervention phase was collected, where control of scapula, active external rotation and pain was measured. Participants were their own control. The population was individuals who trained crossfit at least three times a week and had subacromial pain. During the intervention the participants performed ”shoulder dislocations”. Performing three sets of ten repetitions three times a week. The results were presented in graphs and visually analyzed. Results: Four participants were included in the study whereof one had bilateral disorders. All participants increased control of scapula, four out of five increased active external rotation of the glenohumeral joint. Three out of five participants experienced pain reduction during exercise and at the time of measurement. Conclusion: ”Shoulder dislocations” seems to improve control of scapula and active external range of motion of the glenohumeral joint in crossfit athletes with subacromial pain.

Bakgrund: Ländryggssmärta är en av de vanligaste typerna av muskuloskeletal smärta och den ledande formen av nedsatt funktion världen över. Styrketräning (ST) är en av de vanligaste formerna av konservativ behandling vid kronisk ospecifik ländryggssmärta (CNSLBP). Det saknas rekommendationer för dosering av ST och effekten av olika doseringar är oklar. Syfte: Syftet med denna systematiska litteraturstudie var att kartlägga rapporterade träningsdoseringar vid CNSLBP samt att jämföra effekten av olika doseringar. Metod: En systematisk granskning av randomiserade kontrollerade studier publicerade de fem senaste åren genomfördes efter sökningar i databaserna MEDLINE, CINAHL och PEDro. En kvalitetsbedömning av studierna genomfördes och träningsdosering av styrketräning som behandling vid CNSLBP kartlades och kategoriserades. I inkluderade studier där liknande träningsupplägg med olika dosering jämförts, utvärderades doseringarnas effekt avseende smärtintensitet och funktion. Resultat: Totalt inkluderades sex artiklar. Risken för systematiska fel bedömdes som genomgående låg till medelhög. Träningsdoseringarna kategoriserades som moderata till medelhöga. Enbart en av de sex inkluderade studierna jämförde olika träningsdosering där komponenten intensitet varierats i två grupper. Högintensiv styrketräning uppvisade signifikanta förbättringar avseende funktion och små ickesignifikanta förbättringar avseende smärtintensitet jämfört med den medelintensiva träningsgruppen. Slutsats: Den här litteraturstudien visade att få studier anger träningsdosering av styrketräning som behandling för patienter med CNSLBP. De kartlagda träningsdoseringarna var moderata till medelhöga och liknar doseringarna som rekommenderas för motionärer. Inga slutsatser kunde dras avseende doseringarnas effekt. Framtida kliniska studier med träning som intervention bör definiera styrketräningsdosering vilket anses relevant för såväl forskare som fysioterapeuter i praktiken. / Background: Low back pain is one of the most common musculoskeletal disorders and the leading cause of disability worldwide. Resistance training (RT) is an effective therapeutic modality for the treatment of patients with chronic non-specific low back pain (CNSLBP). However, recommendations of RT dosages is lacking and the effects of different dosages remains unclear. Objective: The objective of this review was to map and evaluate the effectiveness of reported RT dosages for the treatment of CNSLBP. Method: A systematic search for literature was conducted in the databases MEDLINE, CINAHL and PEDro. Dosages were mapped and categorized. Effect sizes of pain intensity and disability were extracted from articles with comparisons between dosages. The risk of bias was judged for the articles, respectively. Results: A total of six articles were included. The dosages were categorized as moderate to medium high. Comparison between dosages was made in one of the included articles. Significant improvements in pain intensity and non-significant improvements in disability in favour of a high intensity group compared to a low intensity training group was found. The risk of bias was consistently judged as low or moderate. Conclusion: This study showed a lack of correctly reported RT dosages. The mapped dosages where corresponding to the recommendations for a healthy population. No conclusions could be drawn upon the effect of different dosages. A clear definition of the RT dosage in future trials is of importance to further investigate the effect of RT as an intervention for the treatment of CNSLBP.