Search results for "power"
showing 10 items of 5099 documents
Caffeine Increases Strength and Power Performance in Resistance-trained Females During Early Follicular Phase
2020
The effects of 4 mg·kg−1caffeine ingestion on strength and power were investigated for the first time, in resistance-trained females during the early follicular phase utilizing a randomized, double-blind, placebo-controlled, crossover design. Fifteen females (29.8 ± 4.0 years, 63.8 ± 5.5 kg [mean ± SD]) ingested caffeine or placebo 60 minutes before completing a test battery separated by 72 hours. One-repetition maximum (1RM), repetitions to failure (RTF) at 60% of 1RM, was assessed in the squat and bench press. Maximal voluntary contraction torque (MVC) and rate of force development (RFD) were measured during isometric knee extensions, while utilizing interpolated twitch technique to measu…
Extending a model of precarious employment: A qualitative study of immigrant workers in Spain.
2010
Background Since the 1980s, changes in the labor market have modified power relations between capital and labor, leading to greater levels of precarious employment among workers. Globalization has led to a growth in migration, as people leave their countries in search of work. We aimed to describe the dimensions of precarious employment for immigrant workers in Spain. Methods Qualitative study using analytic induction. Criterion sampling was used to recruit 129 immigrant workers in Spain with documented and undocumented administrative status. Data quality was ensured by triangulation. Results Immigrant workers reported that precarious employment is characterized by high job instability, a l…
Linking empowering leadership to safety participation in nuclear power plants: a structural equation model.
2012
Abstract Introduction Safety participation is of paramount importance in guaranteeing the safe running of nuclear power plants. Method The present study examined the effects of empowering leadership on safety participation. Results Based on a sample of 495 employees from two Spanish nuclear power plants, structural equation modeling showed that empowering leadership has a significant relationship with safety participation, which is mediated by collaborative team learning. In addition, the results revealed that the relationship between empowering leadership and collaborative learning is partially mediated by the promotion of dialogue and open communication. Conclusions The implications of th…
Clinical practices to promote sleep in the ICU: A multinational survey
2018
PURPOSE: To describe sleep assessment and strategies to promote sleep in adult ICUs in ten countries.METHODS: Multicenter, self-administered survey sent to nurse managers.RESULTS: Response rate was 66% with 522 ICUs providing data. 'Lying quietly with closed eyes' was the characteristic most frequently perceived as indicative of sleep by >60% of responding ICUs in all countries except Italy. Few ICUs (9%) had a protocol for sleep management or used sleep questionnaires (1%). Compared to ICUs in Northern Europe, those in central Europe were more likely to have a sleep promoting protocol (p < 0.001), and to want to implement a protocol (p < 0.001). In >80% of responding ICUs, the …
Runners in their forties dominate ultra-marathons from 50 to 3,100 miles
2014
International audience; OBJECTIVES: This study investigated performance trends and the age of peak running speed in ultra-marathons from 50 to 3,100 miles. METHODS: The running speed and age of the fastest competitors in 50-, 100-, 200-, 1,000- and 3,100-mile events held worldwide from 1971 to 2012 were analyzed using single- and multi-level regression analyses. RESULTS: The number of events and competitors increased exponentially in 50- and 100-mile events. For the annual fastest runners, women improved in 50-mile events, but not men. In 100-mile events, both women and men improved their performance. In 1,000-mile events, men became slower. For the annual top ten runners, women improved in…
Nurse-patient power relationship: preliminary evidence of patients' power messages.
2002
The interactive relationship that is based on sharing power and control is the goal of health counseling practice. This research examined the nurse-patient power relationship and emphasized the patient's perspective. Health counseling sessions, 38 in number, were videotaped, transcribed verbatim, and analyzed by using an adaptation of conversation analysis (CA). The purpose of this research was to describe in detail how patients' minimized power asymmetry during hospital counseling. The results indicate that power is a complex and polysemic phenomenon that can be created jointly. Nurses' power is associated with their medical knowledge, which also patients construct. However, patients have …
Burnout Clinical Subtypes Questionnaire (BCSQ-36): reliability and validity study in Latvia
2020
The study aimed to test the validity of the burnout subtypes hierarchic model operationalized by the 'Burnout Clinical Subtypes Questionnaire' (BCSQ-36) and its applicability in other cultures. To that aim psychometric properties, factorial and convergent validity regarding the Maslach Burnout Inventory - General Survey (MBI-GS), and correlation with demographic factors were reviewed. A voluntary internet-based approach was used on a multi-occupational sample of adult Latvians (n = 394). The results of the internal consistency of the Latvian version of the BCSQ-36 exceeded .89 for all three subtypes. The CFA was used to test a hierarchical factorial model, and the analysis revealed an accep…
Influence of aging on the mechanical behavior of leg extensor muscles.
1980
Age dependence of the mechanical behavior of leg extensor muscle was investigated using vertical jumps with and without a stretch-shortening cycle on the force-platform. A total 226 subjects (113 females and 113 males) ranging in age from 4--73 years were examined. The results indicated in general that performance in males was better than that in females. This difference was reduced when body weight was taken into consideration. The peak performance of the various parameters, such as average force, height of rise of center of gravity, net impulse, and also the average power output, was reached in both sexes between the ages of 20 and 30 years. For example, the average vertical force in squa…
Age-associated changes in skeletal muscles and their effect on mobility: an operational diagnosis of sarcopenia.
2003
Sarcopenia, the reduction of muscle mass and strength that occurs with aging, is widely considered one of the major causes of disability in older persons. Surprisingly, criteria that may help a clinician to identify persons with impaired muscle function are still lacking. Using data from a large representative sample of the general population, we examined how muscle function and calf muscle area change with aging and affect mobility in men and women free of neurological conditions. We tested several putative indicators of sarcopenia, including knee extension isometric torque, handgrip, lower extremity muscle power, and calf muscle area. For each indicator, sarcopenia was considered to be p…
Histological and fine structural features of pancreatic ductal adenocarcinomas in relation to growth and prognosis: studies in xenografted tumours an…
1985
Histology and fine structure of pancreatic ductal adenocarcinomas were assessed with respect to their significance for tumour growth and prognosis. The histological parameters included glandular differentiation, nuclear anaplasia, nuclear size, and mitotic activity (number of mitoses per high power field). Using these criteria three grades of malignancy were distinguished. They correlated well with the growth kinetics of seven human pancreatic ductal adenocarcinomas transplanted into nude mice. The tumour doubling time of a G 3 carcinoma was about half that of a G 1 carcinoma. On electron microscopy the tumour grade was reflected in the degree of functional differentiation of the neoplastic…