Search results for "Strength"
showing 10 items of 2415 documents
Effect of low-load hamstring strength training on the H/Q ratio and electromyographic activity in various gymnastic actions in young aesthetic group …
2013
Muscle balance is an important factor for decreasing injury risks among sports, as weak ago-nist-antagonist strength ratio may predispose to injuries. Hamstring-to-quadriceps (H/Q) strength ratio has been studied in several sports in order to describe the muscular balance of thighs. During pubertal longitudinal growth, hamstrings may be weaker due to the mechanical stress of growth. As both hamstring flexibility and knee extension strength are important for aesthetic group gymnastics (AGG), the H/Q strength ratio might be expected to be low among this sport. Describing muscle activation patterns of hamstrings and quadriceps femoris in AGG actions is efficient for determining the H and Q act…
Serum hormone concentrations and physical performance during concurrent strength and endurance training in recreational male and female endurance run…
2011
To investigate the effects of concurrent strength and endurance training on physical performance and serum hormone levels a total of 32 recreational endurance runners were trained for 18 weeks. Subjects were divided into four training groups separated by the strength training mode and gender. The groups were women’s and men’s combined maximal and explosive strength training group (WME; n=9 and MME; n=9), and women’s and men’s muscle endurance strength training group (WE; n= 8 & ME; n=8). The training was executed in three consecutive periods (I; 10 weeks, II; 4 weeks and III; 4 weeks). The endurance training in all groups was low-intensity (below lactate threshold) running throughout the wh…
Psychosocial Factors and Chronic Illness as Predictors for Anxiety and Depression in Adolescence
2020
Adolescence is a challenging time when emotional difficulties often arise. Self-esteem, good relationships with peers, and emotional competences can buffer the effects of these difficulties. The difficulties can be even greater when coupled with the presence of a chronic physical illness (CD). Our goal is to analyze psychosocial factors and CD as predictors for anxiety and depression. It was compared the results of structural equation models (SEM) with models based on qualitative comparative analysis (QCA) to analyze the possible influence of these variables on levels of anxiety-depression in adolescents with and without CD. The sample consisted of 681 adolescents, between 12 and 16 years o…
A new mixed-mode fracture criterion for large-scale lattice models
2014
Abstract. Reasonable fracture criteria are crucial for the modeling of dynamic failure in computational lattice models. Successful criteria exist for experiments on the micro- and on the mesoscale, which are based on the stress that a bond experiences. In this paper, we test the applicability of these failure criteria to large-scale models, where gravity plays an important role in addition to the externally applied deformation. Brittle structures, resulting from these criteria, do not resemble the outcome predicted by fracture mechanics and by geological observations. For this reason we derive an elliptical fracture criterion, which is based on the strain energy stored in a bond. Simulation…
Well-being and functional abilities in nursing home and home living seniors in Latvia
2018
The society in developed countries is aging. 1.5% of seniors live in nursing homes in Latvia.Aim: to compare functional abilities and well-being between nursing home and home living Latvian seniors.Methods:280 home living seniors and 285 from nursing homes, age ≥ 65 years able to respond to questions and stand up were included in the study based on availability. They were asked to describe their well-being from very bad to very good. The functional abilities were assessed by hand grip strength, the ability to stand up without assistance, the dependence on caregivers (1 – independent, 2 – partly dependent, 3 – fully dependent), the use of walking device assistance devices.Results:The home li…
Could Low-Frequency Electromyostimulation Training be an Effective Alternative to Endurance Training? An Overview in One Adult
2014
This preliminary study aimed to investigate the effects of a six-week low-frequency electromyostimulation training (10Hz) on the cardiovascular, respiratory and muscular systems. To that purpose, aerobic capacity, knee extensor muscles strength and architecture, muscle sympathetic nervous activity, blood pressure and heart rate have been evaluated in one healthy male subject (33 year-old, 1.73 m, 73 kg). Results showed improvement of aerobic capacity (+4.5% and +11.5% for maximal oxygen uptake and ventilatory threshold) and muscle strength (+11% and +16% for voluntary and evoked force). Moreover, for the first time, this study demonstrated low-frequency training effects on muscle architectu…
Effects of between-set interventions on neuromuscular function during isokinetic maximal concentric contractions of the knee extensors
2011
The presents study investigated the effects of between-set interventions on neuromuscular function of the knee extensors during six sets of 10 isokinetic (120°·s(-1)) maximal concentric contractions separated by three minutes. Twelve healthy men (age: 23.9 ± 2.4 yrs) were tested for four different between-set recovery conditions applied during two minutes: passive recovery, active recovery (cycling), electromyostimulation and stretching, in a randomized, crossover design. Before, during and at the end of the isokinetic session, torque and thigh muscles electromyographic activity were measured during maximal voluntary contractions and electrically-evoked doublets. Activation level was calcul…
Development of Composites with a Self-Healing Function
2015
This research aimed to realize experimentally the facilevascular self-healing system in epoxy glass fibre reinforced composite. Using flexiblepolytetrafluoroethylene tubes as removable preforms, the channels were embeddedinto both neat epoxy resin and unidirectional glass-fibre reinforced epoxy laminate.Room temperature curable epoxy resin with a surfactant and an amine-basedhardener were the components of the binary healing agent. The specimens oftapered double cantilever beam geometry were subjected to Mode I fracture tests.Fracture of specimens released the healing agent from channels and triggeredself-healing process of the crack. Tested neat epoxy resin specimensdemonstrated recovery o…
"If I don’t enjoy it, how are my kids going to enjoy it?" : case study in English grammar teaching
2015
The question over how grammar should be taught has been discussed amongst s everal linguistics scholars. Different grammar teaching methods present different focus on the target language, grammar and learner’s role. All of the methods have their strengths and weaknesses and in order to know which method to pick, one must know all the strengths and weaknesses of these methods. In this case study, a teacher from Central Finland was interviewed on her grammar teaching methods and the reasons behind these methods for fifth-graders. Factors influencing her selection of methods were the grammatical topic to be taught, learners’ different learning styles, relevance of the topic and the most natura…
Damage accumulation and life prediction in carbon fibre composite pressure vessels
2009
Composites and nanostructures