scholarly journals Ép és mozgásukban korlátozott kajakos sportolók biomechanikai mozgáselemzése és összehasonlító vizsgálata

2019 ◽  
Vol 160 (52) ◽  
pp. 2061-2066
Author(s):  
Bernadett Kertészné Német ◽  
Tamás Terebessy ◽  
Zoltán Bejek
Keyword(s):  
Body Mass ◽  
Mass Range ◽  
Lower Limbs ◽  
Whole Body ◽  
Special Focus ◽  
Upper Limbs ◽  
Height Range ◽  
Flexion Extension ◽  
The Disabled ◽  
Age Range

Abstract: Introduction: During kayaking, the whole body works in a perfect harmony. While the trunk is doing a rotation, flexion-extension helps to the upper limb to create a special cyclic paddle. The purpose of this study was to gain a better understanding of the physical disabled (later disabled) person’s kayaking motions and to probe whether there were any significant differences between disabled and non-disabled kayakers with special focus on the use of footrest. We hypothesised significantly different ranges of motion and muscle activity in lower limbs but no significant differences in those of the upper limbs. Aim: Our goal was to know more about the abled and disbled kayaking and compare the athlete’s kayaking movements. Method: Thirteen (n = 13) elite disabled athletes (age range: 18–40 years, height range: 164–194 cm, body mass range:74–93 kg), eleven (n = 11) elite non-disabled athletes (age range: 18–40 years, height range:172–197 cm, body mass range: 72–96 kg) and nine (n = 9) athletes whose movements were artificially limited to imitate disabled conditions(“imitation disabled” group) (age range: 18–40 years, height range: 172–197 cm, body mass range: 72–96 kg) were measured. Weba sport kayak ergometer, surface electromyography (EMG), and a 3-dimensional Vicon (MX T40) camera system were used to record the data, and a combined Matlab and MS Excel system was used to analyse the results. Results: In line with our basic assumption, range of motion of the upper limbs was not significantly different between disabled athletes and non-disabled athletes (p ≥ 0.05). However, muscle activities were significantly different in the disabled group compared to the non-disabled group (p ≤ 0.05). In the disabled group the knee joint and trunk motions and muscle activities were also significantly different compared to those in the non-disabled group (p ≤ 0.05). The differences in performance force applied to both footrests and force were significant (p ≤ 0.05). Discussion: The assumption that shoulder and elbow ranges of motion were not significantly different in disabled athletes compared to non-disabled athletes was proven. However, muscle activities were significantly different in the disabled group. In the disabled group, knee and trunk motions and muscle activities were also significantly different compared to the non-disabled group. Significant differences were found in performance, force and footrest use. Our results proved our assumption that motions and muscle activities of disabled and non-disabled athletes were significantly different. Orv Hetil. 2019; 160(52): 2061–2066.

scholarly journals Stride-Phase Kinematic Parameters That Predict Peak Elbow Varus Torque

2020 ◽  
Vol 8 (12) ◽  
pp. 232596712096806
Author(s):  
Hiroshi Tanaka ◽  
Toyohiko Hayashi ◽  
Hiroaki Inui ◽  
Tomoyuki Muto ◽  
Kohnan Tsuchiyama ◽  
...  
Keyword(s):  
Center Of Mass ◽  
Knee Extension ◽  
Lower Limbs ◽  
Whole Body ◽  
Kinematic Parameters ◽  
Acceleration Phase ◽  
3 Dimensional ◽  
Dimensional Measurements ◽  
Upward Displacement ◽  
Age Range

Background: During baseball pitching, a high amount of elbow varus torque in the arm cocking-to-acceleration phase is thought to be a biomechanical risk factor for medial elbow pain and injury. The biomechanics of the stride phase may provide preparation for the arm cocking-to-acceleration phase that follows it. Purpose: To determine the kinematic parameters that predict peak elbow varus torque during the stride phase of pitching. Study Design: Descriptive laboratory study. Methods: Participants were 107 high school baseball pitchers (age range, 15-18 years) without shoulder or elbow problems. Whole-body kinematics and kinetics during fastball pitching were analyzed using 3-dimensional measurements from 36 retroreflective markers. A total of 26 kinematic parameters of the upper and lower limbs during the stride phase leading up to the stride foot contact were extracted for multiple regression analysis to assess their combined effect on the magnitude of peak elbow varus torque. Results: Increased wrist extension, elbow pronation, knee flexion on the leading leg, knee extension on the trailing leg at stride foot contact, and upward displacement of the body’s center of mass in the stride phase were significantly correlated with decreased peak elbow varus torque (all P < .05). Moreover, 38% of the variance in peak elbow varus torque was explained by a combination of these 5 significant kinematic variables ( P < .001). Conclusion: We found that 5 kinematic parameters during the stride phase and the combination of these parameters were associated with peak elbow varus torque. The stride phase provides biomechanical preparation for pitching and plays a key role in peak elbow varus torque in subsequent pitching phases. Clinical Relevance: The present data can be used to screen pitching mechanics with motion capture assessment to reduce peak elbow varus torque. Decreased peak elbow varus torque is expected to reduce the risk of elbow medial pain and injury.

Body Composition and Bioelectrical Impedance Analysis-Derived Raw Variables in Pole Dancers

2020 ◽  
Author(s):  
Giada Ballarin ◽  
Luca Scalfi ◽  
Fabiana Monfrecola ◽  
Paola Alicante ◽  
Alessandro Bianco ◽  
...  
Keyword(s):  
Body Composition ◽  
Bioelectrical Impedance Analysis ◽  
Bioelectrical Impedance ◽  
Impedance Analysis ◽  
Lower Limbs ◽  
Muscle Quality ◽  
Whole Body ◽  
Training Level ◽  
Upper Limbs ◽  
High Frequencies

Abstract Background: Pole dance is a type of functional training whose effects on body composition have been only poorly explored. Bioelectrical impedance analysis (BIA)is a field method to estimate fat-free mass (FFM), fat mass (FM), etc. In addition, of particular interest for athletes, raw BIA variables such as impedance ratio =IR (between impedance-Z at high frequencies and Z at low frequencies) and phase angle=PhA may be considered as promising markers of muscle quality since they arerelated to body cell mass (BCM) and the ratio between extracellular water and intracellular water.The aim of the study was to evaluate the effect of pole dancing training on body composition and especially on IR and PhA of the whole body, upper limbs and lower limbs. Methods: Forty female pole dancers (age 27.4±5.1 years, body weight 57.0±6.9 kg, body mass index-BMI 22.2±2.3 kg/m²) and fifty-nine control young women (26.8±4.7 years, 58.6±6.4 kg, BMI 22.3±1.8 kg/m²) participated in the study.BIA was performed on the whole body, upper limbs and lower limbs at 5-50-100-250 kHz. FFM, FFM index, FMand percentage of FM were then predicted. Raw BIA variables were also considered: IR and PhA, and also bioelectrical impedance indexes (stature²/Z, related to body water compartments). Arm muscle area (AMA) and arm fat area (AFA) were calculated from triceps skinfold and arm circumference. Results: Compared to controls pole dancers exhibited higher FFM index and BI indexes at low and high frequencies as well as lower percentage of FM. Whole-body BI indexes correlated with AMA but not with AFA. PhA was greater and IRs were smaller in pole dancers than controls for the whole body and more markedly for upper limbs, whereas there were no differences for lower limbs. When considering training level, professional and amateur pole dancers did not differ with respect to body weight and BMI. After adjusting for weight, FFM and FFMI were greater in the more trained than in the less trained group, while FM and %FM were smaller. Whole-body PhA and IRs as well as BI indexes tended to be higher in the professionalsthan amateurs, with much more significant differences in upper limb PhA and IRs. Conclusions: Pole dance training has a significant effect, possibly depending also on training level, not only on FFM and FM, but also on those raw BIA variables that may be considered as markers of muscle quality.

scholarly journals Acute Hepatitis B Associated Neuromyopathy

2021 ◽  
Author(s):  
Boby Varkey Maramattom
Keyword(s):  
Hepatitis B ◽  
Liver Function ◽  
Acute Infection ◽  
Liver Function Tests ◽  
Lower Limbs ◽  
Whole Body ◽  
Upper Limbs ◽  
Leg Muscles ◽  
Function Tests ◽  
Coa Reductase

Abstract A 67 year old man presented with abdominal discomfort and jaundice for 1 month with difficulty in walking with severe pain in both thighs of 3 days duration. He was a diabetic and hypertensive on medications. There was no history of HMG CoA reductase inhibitor use. On examination he had icterus and grade 2 power in the proximal upper and lower limbs. Deep tendon reflexes were inelicitable. On day 1, CRP was 37mg/L and liver function tests were deranged [ Total Bilirubin 16 mg%, direct 14.3mg%, SGOT [920 U/L], SGPT [590 U/L], Alkaline Phosphatase 276.5 U/L. Serum CPK levels [9768 U/L], LDH [979 U/L] and Ferritin [7264 ng/ml] were elevated on day 2. ANA profile was negative. Leptospiral antibody, dengue serology and SARS-CoV2 RT-PCR were negative. Hepatitis B serology was compatible with an acute infection. On day 3, nerve conduction studies showed an axonal sensory-motor polyneuropathy predominantly involving the lower limbs. F waves were absent. Fibrillations and positive waves were picked up from the Tibialis anterior muscles bilaterally. He was started on IVIG 2gm/kg x 5 days. On day 4, his CPK levels increased to >42,000 U/L and he was shifted to the ICU and started on forced alkaline diuresis. Urine myoglobin was positive.. On day 6, MRI whole body muscle STIR imaging showed patchy ill-defined STIR hyperintensities involving the muscles of the gluteal, pelvic girdle muscles, both thighs and leg muscles with fascial edema. The muscles of the upper limbs and shoulder girdles also showed patchy STIR hyperintensities. Diffuse subcutaneous oedema was noted in the soft tissue of the thighs, legs and abdominal wall. Over the next few days, the weakness in the upper limbs worsened and he developed a weak cough. He did not consent to a lumbar puncture or muscle biopsy. Over the next 9 days, his liver function tests and CPK levels gradually normalised. He was also started on Entacavir. By day 10, his upper limb and distal lower limb had improved to grade 4/5 power and he was able to stand with support and he was discharged.

scholarly journals High 1RM Tests Reproducibility and Validity Are Not Dependent on Training Experience, Muscle Group Tested or Strength Level in Older Women

2018 ◽  
Author(s):  
Matheus Barbalho ◽  
Paulo Gentil ◽  
Rodolfo Raiol ◽  
Fabrício Boscolo Del Vecchio ◽  
Rodrigo Ramirez-Campillo ◽  
...  
Keyword(s):  
Body Mass ◽  
Elderly Women ◽  
High Reliability ◽  
Intraclass Correlation ◽  
Correlation Coefficients ◽  
The Elderly ◽  
Lower Limbs ◽  
Strength Level ◽  
Upper Limbs ◽  
Training Experience

Background: The maximal one-repetition test (1-RM) is widely used in scientific research; however, there are conflict results regarding its reproducibility in elderly population. The present study aimed to analyze the reproducibility the test both before and after a 12 week training period by using the bench press and leg press 45&deg; 1-RM tests in the elderly taking into consideration the training experience and strength level of the women. Methods: Elderly women (n = 376; age, 68.5 &plusmn; 14.1 years; height, 162.7 &plusmn; 5.5 cm; body mass, 71.2 &plusmn; 16.0 kg) who underwent &ge;3 months of resistance training performed an initial week of familiarization and a second week of testing and retest, with a 48&ndash;72 hour interval. Results: The results showed maximal and relative load strength of 39.3 kg and 0.59 kg/body mass for lower limbs and 20.9 kg and 0.31 kg/body mass for upper limbs. The Kappa indices were 0.93 and 0.95, and the intraclass correlation coefficients were 0.99 and 0.99 for the lower and upper limbs, respectively. Conclusion: Therefore, the present study confirms that the 1-RM test has high reliability and reproducibility in the elderly, for both upper and lower limbs.

scholarly journals LOCALIZED FAT-FREE MASS DOES NOT INFLUENCE MUSCLE STRENGTH IN OBESE AND NON-OBESE BOYS

2018 ◽  
Vol 24 (5) ◽  
pp. 361-365 ◽  
Author(s):  
Frederico Bento de Moraes Junior ◽  
Wendell Arthur Lopes ◽  
Larissa Rosa da Silva ◽  
Cristiane Tavares Araújo ◽  
Incare Correa de Jesus ◽  
...  
Keyword(s):  
Body Composition ◽  
Muscle Strength ◽  
Linear Regression ◽  
Body Mass ◽  
Eating Habits ◽  
Normal Weight ◽  
Fat Free Mass ◽  
Lower Limbs ◽  
Upper Limbs ◽  
Level Of Evidence

ABSTRACT Introduction: Obesity in adolescents has increased worldwide, and is generally associated with poor eating habits and physical inactivity. Objective: To compare absolute and relative muscle strength with body mass (BM), fat-free mass (FFM) and localized FFM of upper and lower limbs among obese and non-obese adolescents. Methods: BM, height and body mass index (BMI) were verified in 39 male adolescents (aged 13-17 years). Body composition was measured by dual-energy X-ray absorptiometry (DXA) and maximal strength of upper and lower limbs was estimated by a one-repetition maximum (1RM) test. Participants were divided into three groups: eutrophic (normal weight) (n=11), overweight (n=14), and obese (n=14). One-way ANOVA was used to compare the variables, followed by a Bonferroni post-hoc test for multiple comparisons. Pearson's correlation coefficient was used for relevant correlations and multiple linear regression to verify the influence of anthropometric variables, body composition and muscle strength of upper and lower limbs. Results: Obese and overweight adolescents had absolute muscle strength values similar to those of the eutrophic adolescents, which were lower when corrected by BM (p<0.001). However, muscle strength related to FFM and localized FFM were similar between groups in both upper and lower limbs. Linear regression showed that BMI explained 59% of the variation in absolute muscle strength of the lower limbs (β=0.59, p<0.05), FFM explained 84% of the variation in absolute muscle strength of the upper limbs (β=0.84, p<0.01) and 68% of the lower limbs (β=0.68; p<0.01), while localized FM was inversely associated in the lower limbs (β=−0.53, p<0.05). Conclusion: Muscle strength of lower and upper limbs, when corrected by localized FFM, does not distinguish between overweight and normal weight adolescents, indicating that obesity does not have a negative effect on generation of muscle strength in obese boys. Level of Evidence III; Case-control study.

scholarly journals Velocity, Oxygen Uptake, and Metabolic Cost of Pull, Kick, and Whole-Body Swimming

2017 ◽  
Vol 12 (8) ◽  
pp. 1046-1051 ◽  
Author(s):  
Kirstin S. Morris ◽  
Mark A. Osborne ◽  
Megan E. Shephard ◽  
David G. Jenkins ◽  
Tina L. Skinner
Keyword(s):  
Oxygen Uptake ◽  
Metabolic Cost ◽  
Lower Limbs ◽  
Whole Body ◽  
Upper Limbs ◽  
Front Crawl ◽  
Testing Protocol ◽  
Elite Swimmers ◽  
Before And After ◽  
Rate Controlled

Purpose:The contributions of the limbs to velocity and metabolic parameters in front-crawl swimming at different intensities have not been identified considering both stroke and kick rate. Consequently, velocity, oxygen uptake (V̇O2), and metabolic cost of swimming with the whole body (swim), the upper limbs only (pull), and lower limbs only (kick) were compared with stroke and kick rate controlled.Methods:Twenty elite swimmers completed six 200-m trials: 2 swim, 2 pull, and 2 kick. Swim trials were guided by underwater lights at paces equivalent to 65% ± 3% and 78% ± 3% of participants’ 200-m-freestyle personal-best pace; paces were described as low and moderate, respectively. In the pull and kick trials, swimmers aimed to match the stroke and kick rates, respectively, recorded during the swim trials. V̇O2 was measured continuously, with velocity and metabolic cost calculated for each 200-m effort.Results:The velocity contribution of the upper limbs (mean ± SD; low 63.9% ± 6.2%, moderate 59.6% ± 4.2%) was greater than that of the lower limbs to a large extent at both intensities (low ES = 4.40, moderate ES = 4.60). The V̇O2 used by the upper limbs differed between the intensities (low 55.5% ± 6.9%, moderate 51.4% ± 4.0%; ES = 0.74). The lower limbs were responsible for a greater percentage of the metabolic cost than the upper limbs at both intensities (low 56.1% ± 9.5%, ES = 1.30; moderate 55.1% ± 6.6%, ES = 1.55).Conclusions:Implementation of this testing protocol before and after a pull- or kick-training block will enable sport scientists to determine how the velocity contributions and/or metabolic cost of the upper- and lower-limb actions have responded to the training program.

scholarly journals Effect of environmental and paragenetic factors on birth mass variability of Mis sheep populations

2009 ◽  
Vol 25 (3-4) ◽  
pp. 213-219
Author(s):  
M.P. Petrovic ◽  
Ruzic Muslic ◽  
N. Maksimovic ◽  
N. Memisi
Keyword(s):  
Body Mass ◽  
Animal Husbandry ◽  
Mass Range ◽  
The Body ◽  
Sheep Population ◽  
Average Body Mass ◽  
The Difference ◽  
Mother’S Age ◽  
Age Range ◽  
Average Body

The aim of the study was to determine effect of environmental and paragenetic factors on body mass of lambs at birth. Investigation was realized on experimental sheep farm of Institute for Animal Husbandry, Belgrade-Zemun. Animal included in this research were representatives of Mis sheep population. The results of the research confirm that values of the birth mass range from 4.43 kg to 4,58 kg observed by years and 4.48 kg to 4.55 kg depending on the lambing season. Statistical analysis showed that the existing differences still significant on the level (P <0.05). Variations of body mass in lambs depending on the mother's age range in the interval from 4.29 kg to 4.52 kg and statistically very significant(P<0.01). Type of birth has also expressed a significant effect on the body mass of lambs at birth and variations range from 4.31 kg (twins) to 4.59 kg (single). Existing differences was statistically very significant (P<0.01). Average body mass in lambs depending on sex of lamb were almost the same, 4.54 kg male and 4.52 kg female, and the difference is not statistically significant (P> 0.05).

scholarly journals Diagnostic Value of Whole-Body MRI Short Protocols in Bone Lesion Detection in Multiple Myeloma Patients

Diagnostics ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1053
Author(s):  
Davide Ippolito ◽  
Teresa Giandola ◽  
Cesare Maino ◽  
Davide Gandola ◽  
Maria Ragusi ◽  
...  
Keyword(s):  
Multiple Myeloma ◽  
Bone Marrow Involvement ◽  
Bone Lesion ◽  
Diagnostic Value ◽  
Lesion Detection ◽  
Lower Limbs ◽  
Whole Body ◽  
Bone Lesions ◽  
Whole Body Mri ◽  
Mri Protocol

The aim of the study is to evaluate the effectiveness of short whole-body magnetic resonance imaging (WBMRI) protocols for the overall assessment of bone marrow involvement in patients with multiple myeloma (MM), in comparison with standard whole-body MRI protocol. Patients with biopsy-proven MM, who underwent a WBMRI with full-body coverage (from vertex to feet) were retrospectively enrolled. WBMRI images were independently evaluated by two expert radiologists, in terms of infiltration patterns (normal, focal, diffuse, and combined), according to location (the whole skeleton was divided into six anatomic districts: skull, spine, sternum and ribs, upper limbs, pelvis and proximal two-thirds of the femur, remaining parts of lower limbs) and lytic lesions number (<5, 5–20, and >20). The majority of patients showed focal and combined infiltration patterns with bone lesions predominantly distributed in the spine and pelvis. As skull and lower limbs are less frequently involved by focal bone lesions, excluding them from the standard MRI protocol allows to obtain a shorter protocol, maintaining a good diagnostic value.

scholarly journals Insulin-mediated muscle microvascular perfusion and its phenotypic predictors in humans

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Kaitlin M. Love ◽  
Linda A. Jahn ◽  
Lee M. Hartline ◽  
James T. Patrie ◽  
Eugene J. Barrett ◽  
...  
Keyword(s):  
Body Mass ◽  
Hdl Cholesterol ◽  
Total Body Weight ◽  
Microvascular Perfusion ◽  
Whole Body ◽  
Glucose Disposal ◽  
Phenotypic Traits ◽  
Predictive Information ◽  
Class 1 ◽  
Insulin Responses

AbstractInsulin increases muscle microvascular perfusion and enhances tissue insulin and nutrient delivery. Our aim was to determine phenotypic traits that foretell human muscle microvascular insulin responses. Hyperinsulinemic euglycemic clamps were performed in 97 adult humans who were lean and healthy, had class 1 obesity without comorbidities, or controlled type 1 diabetes without complications. Insulin-mediated whole-body glucose disposal rates (M-value) and insulin-induced changes in muscle microvascular blood volume (ΔMBV) were determined. Univariate and multivariate analyses were conducted to examine bivariate and multivariate relationships between outcomes, ΔMBV and M-value, and predictor variables, body mass index (BMI), total body weight (WT), percent body fat (BF), lean body mass, blood pressure, maximum consumption of oxygen (VO2max), plasma LDL (LDL-C) and HDL cholesterol, triglycerides (TG), and fasting insulin (INS) levels. Among all factors, only M-value (r = 0.23, p = 0.02) and VO2max (r = 0.20, p = 0.047) correlated with ΔMBV. Conversely, INS (r = − 0.48, p ≤ 0.0001), BF (r = − 0.54, p ≤ 0.001), VO2max (r = 0.5, p ≤ 0.001), BMI (r = − 0.40, p < 0.001), WT (r = − 0.33, p = 0.001), LDL-C (r = − 0.26, p = 0.009), TG (r = − 0.25, p = 0.012) correlated with M-value. While both ΔMBV (p = 0.045) and TG (p = 0.03) provided significant predictive information about M-value in the multivariate regression model, only M-value was uniquely predictive of ΔMBV (p = 0.045). Thus, both M-value and VO2max correlated with ΔMBV but only M-value provided unique predictive information about ΔMBV. This suggests that metabolic and microvascular insulin responses are important predictors of one another, but most metabolic insulin resistance predictors do not predict microvascular insulin responses.

scholarly journals Acute effect of high-definition and conventional tDCS on exercise performance and psychophysiological responses in endurance athletes: a randomized controlled trial

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Daniel Gomes da Silva Machado ◽  
Marom Bikson ◽  
Abhishek Datta ◽  
Egas Caparelli-Dáquer ◽  
Gozde Unal ◽  
...  
Keyword(s):  
Exercise Performance ◽  
Controlled Trial ◽  
Lower Limbs ◽  
Endurance Athletes ◽  
Test Reliability ◽  
Whole Body ◽  
Time To Exhaustion ◽  
Small Ring ◽  
High Definition ◽  
Psychophysiological Responses

AbstractTranscranial direct current stimulation (tDCS) has been used aiming to boost exercise performance and inconsistent findings have been reported. One possible explanation is related to the limitations of the so-called “conventional” tDCS, which uses large rectangular electrodes, resulting in a diffuse electric field. A new tDCS technique called high-definition tDCS (HD-tDCS) has been recently developed. HD-tDCS uses small ring electrodes and produces improved focality and greater magnitude of its aftereffects. This study tested whether HD-tDCS would improve exercise performance to a greater extent than conventional tDCS. Twelve endurance athletes (29.4 ± 7.3 years; 60.15 ± 5.09 ml kg−1 min−1) were enrolled in this single-center, randomized, crossover, and sham-controlled trial. To test reliability, participants performed two time to exhaustion (TTE) tests (control conditions) on a cycle simulator with 80% of peak power until volitional exhaustion. Next, they randomly received HD-tDCS (2.4 mA), conventional (2.0 mA), or active sham tDCS (2.0 mA) over the motor cortex for 20-min before performing the TTE test. TTE, heart rate (HR), associative thoughts, peripheral (lower limbs), and whole-body ratings of perceived exertion (RPE) were recorded every minute. Outcome measures were reliable. There was no difference in TTE between HD-tDCS (853.1 ± 288.6 s), simulated conventional (827.8 ± 278.7 s), sham (794.3 ± 271.2 s), or control conditions (TTE1 = 751.1 ± 261.6 s or TTE2 = 770.8 ± 250.6 s) [F(1.95; 21.4) = 1.537; P = 0.24; η2p = 0.123]. There was no effect on peripheral or whole-body RPE and associative thoughts (P > 0.05). No serious adverse effect was reported. A single session of neither HD-tDCS nor conventional tDCS changed exercise performance and psychophysiological responses in athletes, suggesting that a ceiling effect may exist.

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