Muscle Force Patterns in Lower Extremity Muscles for Elite Discus Throwers, Javelin Throwers and Shot-Putters - A Case Study.

Optimal release variables, as well as the kinematics and kinetics of athletes, are crucial for the maximization of throwing distance in athletics. Mathematical models and simulations allow throwing techniques to be studied. However, muscle force patterns and the contribution of specific muscle groups in athletics throwing events are not well understood and require detailed research.

Non-specific low back pain: cross-sectional study of 11,423 children and youth and the association with the perception of heaviness in carrying of schoolbags.

Background: Carrying a schoolbag is a daily activity for most children and adolescents.The perception of a schoolbag's weight depends upon the individual and is a relevant theme in schoolchildren. Describing the association between the perception of heaviness in carrying a schoolbag and NLBP can facilitate the planning of preventive programs, quite different from those based on specific weight limits for schoolbags in children and youth.

Bone mineral density and body composition in Polish girls with Myelomeningocele: effects of adapted physical activity and past fractures.

The aim of this cross-sectional study was to evaluate the relationship between the condition of bone mineral density and body composition and the adapted physical activity, the number of past fractures and selected somatic characteristics of girls with myelomeningocele (MMC). The study examined 37 girls with myelomeningocele (MMC) at the age of 11.9 ± 1.

Distance Motor Learning during the COVID-19 Induced Confinement: Video Feedback with a Pedagogical Activity Improves the Snatch Technique in Young Athletes.

The purpose of the present study was to investigate which of two strategies, Video Feedback with Pedagogical Activity (VF-PA) or Video Feedback (VF), would be more beneficial for the remote error correction of the snatch weightlifting technique during the confinement period. Thirty-five school aged children with at least three months of weightlifting experience were randomized to one of three training conditions: VF-PA, VF or the Control group (CONT). Subjects underwent test sessions one week before (T0) and one day after (T1) a six-session training period and a retention test session a week later (T2).

The Impact of Visual Input and Support Area Manipulation on Postural Control in Subjects after Osteoporotic Vertebral Fracture.

Osteoporosis is a prevalent health concern among older adults and is associated with an increased risk of falls that may result in fracture, injury, or even death. Identifying the risk factors for falls and assessing the complexity of postural control within this population is essential for developing effective regimes for fall prevention. The aim of this study was to assess postural control in individuals recovering from osteoporotic vertebral fractures while performing various stability tasks.

To Be a Champion of the 24-h Ultramarathon Race. If Not the Heart ... Mosaic Theory?

This comprehensive case analysis aimed to identify the features enabling a runner to achieve championship in 24-h ultramarathon (UM) races. A 36-year-old, multiple medalist of the World Championships in 24-h running, was assessed before, one and 10 days after a 24-h run. Results of his extensive laboratory and cardiological diagnostics with transthoracic echocardiography (TTE) and a one-time cardiopulmonary exercise test (CPET) were analyzed.

Epicardial Adipose Tissue and Cardiovascular Risk Assessment in Ultra-Marathon Runners: A Pilot Study.

Epicardial adipose tissue (EAT) volume is associated with cardiovascular disease (CVD). Data regarding the influence of extremely intensive training on CVD are scarce. We compared EAT volume among ultra-marathon runners and in the sedentary control group, and assessed the correlations between EAT and risk factors of coronary artery disease (CAD).

Effects of Aquatic Therapy for Children with Autism Spectrum Disorder on Social Competence and Quality of Life: A Mixed Methods Study.

Autism Spectrum Disorder (ASD) is a constellation of social deficits and repetitive sensory-motor behaviours. Aquatic therapy (AT) may be effective in improving the social interactions and behaviours in children with ASD. The objective of this study was to evaluate the effects of an AT program on social competence and quality of life and to understand participant's experiences related to the intervention by obtaining qualitative data.

The effect of unilateral training on contralateral limb power in young women and men.

The purpose of this study was to determine the effect of training of one side of the body on the muscle torques and power output on the trained and untrained side. Seventeen female and twenty-two male students were subject to a four-week knee joint power training regimen on a specially designed stand. The subjects were divided into two groups: a training group (female - N = 11 and male - N = 16) and a control group (female - N = 6 and male - N = 6).

Unseeded, spontaneous nucleation of spherulitic magnesium calcite.

Most of the sedimentary carbonates deposited in the marine environments are composed of calcium carbonate minerals with varying amounts of incorporated Mg. However, understanding how interactions of impurities with carbonate and their incorporation affect sediments behavior remains a challenge. Here, a new insight is obtained by monitoring solution composition, morphology, and electrokinetic potential of carbonate particles formed in a spontaneous unseeded batch precipitation experiment using electrochemical and scanning electron microscopy methods.

Strategies for Coping With Stress in Athletes During the COVID-19 Pandemic and Their Predictors.

The aim of the study was to compare the strategies of coping with stress during the COVID-19 epidemic in athletes involved in Olympic preparations (57 potential Olympians) and students of physical education (54 extramural students), and to determine their depending on the variable gender. The research was conducted in the form of an on-line survey in the period of April 7-28 during the COVID-19 pandemic. Four standard psychological questionnaires were used.

Somatic determinants of changes in selected body posture parameters in younger school-age children.

Background: The aim of this study was to describe changes in selected parameters of body posture in children between 5 and 9 years old with diversified somatic structures.

Methods: The study was carried out in 2015 and then repeated in 2018 among 67 participants who had previously been observed to have scoliotic posture. Basic body weight and height measurements were taken, which were then used to calculate the body mass index.

Assessment of the Effectiveness of Rehabilitation after Total Knee Replacement Surgery Using Sample Entropy and Classical Measures of Body Balance.

Exercises in virtual reality (VR) have recently become a popular form of rehabilitation and are reported to be more effective than a standard rehabilitation protocol alone. The aim of this study was to assess the efficacy of adjunct VR training in improving postural control in patients after total knee replacement surgery (TKR). Forty-two patients within 7-14 days of TKR were enrolled and divided into a VR group and a control group (C).

Women after Bilateral Surgical Correction of Hallux Valgus Do Not Show Improvement in Spatiotemporal Gait Parameters at 18 Weeks Postoperatively.

Background: Hallux valgus (HV) is a gait-altering orthopedic deformity, somewhat more prevalent in women, which often affects both limbs. Although surgery is a commonly applied treatment, there is no consensus in the literature on how invasive HV correction affects spatiotemporal gait parameters, or how quickly improvement can be expected. We investigated gait parameters in female HV patients who underwent bilateral surgical correction of hallux valgus, both preoperatively and 18 weeks following surgery (a timeframe relevant from the perspective of physical therapy), and also in relation to a non-HV control group.

Balance and functional disorders in geriatric patients after total hip prosthesis removal.

Background: One of the most difficult complications of total hip arthroplasty is an infection in the area of the implant with an incidence of 0.5% to 2.5% resulting in the most severe situation in prosthesis removal.

Cross-Cultural Adaptation and Validation of the Musculoskeletal Pain Intensity and Interference Questionnaire for Musicians of the Polish Population (MPIIQM-P).

BACKGROUND The aim of the study was the cross-cultural adaptation and validation of the Musculoskeletal Pain Intensity and Interference Questionnaire for Musicians. MATERIAL AND METHODS The process consisted of the following stages: forward translation, backward translation, analysis by committee of experts, pretest of Polish-language version of questionnaire, and cross-cultural validation: psychometric evaluation. In the last step, a convenience sample of 31 professional orchestra musicians (professional experience 16.

Subjective Rank of the Competition as a Factor Differentiating Between the Affective States of Swimmers and Their Sport Performance.

Purpose: The aim of the study was to establish the differences in affective states of swimmers depending on the subjective rank of the competition and the relationship between affective states and performance in sports competitions of low, medium and high subjectively perceived rank.

Methods: The respondents ( = 31) aged from 15 to 23 years (18.1 ± 2.

Bone Mineral Density in Adolescent Boys: Cross-Sectional Observational Study.

Physical inactivity of children can be a precursor of reduced bone mineral density, considered to be a typical problem only in old age. The aim of this study was to evaluate bone mineral density in 96 Polish boys aged 14-17 years with varied physical activity (swimmers, track and field athletes, non-athletes) and the effect of bone composition, birth weight and breastfeeding during infancy on bone parameters. Anthropometric and body composition measurements were performed according to the kinanthropometric standards.

Intervention for improvement the diet and physical activity of children and adolescents in Poland.

Background: The effects of a two-year educational Programme "Keep Balance" addressed to children and adolescents have been evaluated. Its purpose has been to implement the rules of proper nutrition and increasing the level of physical activity on the population level.

Objective: The main objective of the evaluation was an indication if, after two years of programme activities, outcome indicators have been achieved.

Does the Aquatic Breathing Program Improve Lung Function in Adolescents with Scoliosis?

To determine pulmonary parameters in adolescents with scoliosis after three weeks of intensive physiotherapeutic scoliosis-specific exercises based on the Aquatic Breathing Program (ABP) compared to corrective swimming (CS). A pretest-posttest control group design was used. The ABP group comprised 13 adolescents (age 14.

The Effect of Endurance Training on Brain-Derived Neurotrophic Factor and Inflammatory Markers in Healthy People and Parkinson's Disease. A Narrative Review.

One purpose of the training conducted by people is to lose bodyweight and improve their physical condition. It is well-known that endurance training provides many positive changes in the body, not only those associated with current beauty standards. It also promotes biochemical changes such as a decreased inflammatory status, memory improvements through increased brain-derived neurotrophic factor levels, and reduced stress hormone levels.

Influence of Attentional Manipulation on Jumping Performance: A Systematic Review and Meta-Analysis.

Enhancing jumping ability can lead to substantial benefits in sports performance and physical activity. Previous studies indicate that directing an individual's attention externally before the jump is an effective way to improve jumping performance, especially when the standing long jump (SLJ) and vertical jumps (VJs) are performed. To scrutinize reported findings, we systematically reviewed studies that compared the effects of attentional manipulations on jumping performance in adults.

Growth change in Polish women: Reduction of the secular trends?

The aim of the study was to analyse changes in the average height of adult Polish women born in 1931-2001 in the aspect of dynamically changing economic and socio-economic conditions of the living environment. An ethnically homogeneous group of 6,028 adult women from large Polish cities, born in 1931-2001, living between 1931 and 2020, were examined using the same research methods and research equipment. All women were divided into eight birth cohorts.

High-dose testosterone supplementation disturbs liver pro-oxidant/antioxidant balance and function in adolescent male Wistar rats undergoing moderate-intensity endurance training.

In some countries, anabolic-androgenic steroid abuse is rampant among adolescent boys and young men, including some of those seeking physical fitness and/or pleasing appearance through various exercise types. This tactic carries the risk of severe harmful health effects, including liver injury. Most anabolic-androgenic steroid stacking protocols employed are based on the use of the 'prototypic' anabolic-androgenic steroid testosterone and/or its esters.