Search Results
Results 51 - 100 of 627
1 2 3 4 5 6 7 8 9 10 >
Parker Simpson Len - - 2011
A single 3-min all-out cycling test can be used to estimate the power asymptote (critical power, CP) and the curvature constant (W') of the power-duration relationship for severe-intensity exercise. It was hypothesized that when exercise immediately preceding the 3-min all-out test was performed <CP, the CP and W' parameters would ...
Alcaraz Pedro E - - 2011
Alcaraz, PE, Romero-Arenas, S, Vila, H, and Ferragut, C. Power-load curve in trained sprinters. A preliminary study. J Strength Cond Res 25(11): 3045-3050, 2011-The levels of lower-limb strength and power can distinguish between athletes of different levels in a number of sports, specifically in sprinting. In this sense, the purposes ...
Biscarini Andrea - - 2011
We derived the exact analytical expression of the instantaneous joint power in exercises with single-joint, variable-resistance, selectorized strength-training equipment, taking into account all the relevant geometric, kinematic and dynamic variables of both the movable equipment elements (resistance input lever, cam-pulley system, weight stack) and of the user's exercising limb. A ...
Almudehki Fuad - - 2011
To investigate the effect of hot exposure on the ability to perform intermittent cycling sprints. Ten male volunteers performed 35min of intermittent cycling comprising of 8 maximal 6-s sprints interspersed by 1min of passive recovery followed by 4min of constant-load pedaling (1Wkg(-1) of body weight) on a cycle ergometer in ...
Jandacka Daniel - - 2011
Jandacka, D and Uchytil, J. Optimal load maximizes the mean mechanical power output during upper extremity exercise in highly trained soccer players. J Strength Cond Res 25(X): 000-000, 2011-The purpose of this study was to determine the optimal load for the maximal power output during the acceleration phase of a ...
Kox Matthijs - - 2011
HRV (heart rate variability) analysis is a widely employed method to assess cardiac autonomic nervous system activity. Accurate HRV measurement is critical to its value as a diagnostic and prognostic tool. Different breathing patterns may affect HRV, but results obtained under static conditions are conflicting. HRV indices decrease considerably during ...
Jacobs R A - - 2011
Human endurance performance can be predicted from maximal oxygen consumption (Vo(2max)), lactate threshold, and exercise efficiency. These physiological parameters, however, are not wholly exclusive from one another, and their interplay is complex. Accordingly, we sought to identify more specific measurements explaining the range of performance among athletes. Out of 150 ...
Morin Jean-Benoit - - 2011
We investigated the changes in constant velocity spring-mass behavior after high intensity sprint fatigue in order to better interpret the results recently reported after ultra-long distance (ULD) exercises. Our hypothesis was that after repeated sprints (RS), subjects may likely experience losses of force such as after ULD, but the necessity ...
Barker Alan R - - 2011
This study examined whether critical power (CP) in adolescents: (1) provides a landmark for maximal steady-state exercise; and (2) can be determined using 'all-out' exercise. Nine active 14-15 year olds (6 females, 3 males) performed five cycling tests: (1) a ramp test to determine [Formula: see text]; (2) up to four ...
Chtourou Hamdi - - 2011
The present study was designed to evaluate time-of-day effects on electromyographic (EMG) activity changes during a short-term intense cycling exercise. In a randomized order, 22 male subjects were asked to perform a 30-s Wingate test against a constant braking load of 0.087 kg·kg(-1) body mass during two experimental sessions, which were ...
McBride Jeffrey M - - 2011
Abstract Nine males (age 24.7 ± 2.1 years, height 175.3 ± 5.5 cm, body mass 80.8 ± 7.2 kg, power clean 1-RM 97.1 ± 6.36 kg, squat 1-RM = 138.3 ± 20.9 kg) participated in this study. On day 1, the participants performed a one-repetition maximum (1-RM) in the power clean and the squat. On days 2, 3, and 4, participants performed the power clean, squat ...
Castle Paul - - 2011
Abstract The aim of this study was to determine the effect of 10 days of heat acclimation with and without pre-cooling on intermittent sprint exercise performance in the heat. Eight males completed three intermittent cycling sprint protocols before and after 10 days of heat acclimation. Before acclimation, one sprint protocol ...
Boecker Henning - - 2011
Physical exercise contributes to maintenance of physical health. There is growing evidence, both from animal work and from human epidemiological and longitudinal intervention studies, that physical exercise also impacts directly on the brain, mediating structural integrity and improving cognitive functioning. Modern neuroimaging approaches, in particular magnetic resonance imaging (MRI) based ...
Comstock Brett A - - 2011
Comstock, BA, Solomon-Hill, G, Flanagan, SD, Earp, JE, Luk, H-Y, Dobbins, KA, Dunn-Lewis, C, Fragala, MS, Ho, J-Y, Hatfield, DL, Vingren, JL, Denegar, CR, Volek, JS, Kupchak, BR, Maresh, CR, and Kraemer, WJ. Validity of the myotest® in measuring force and power production in the squat and bench press. J ...
Bouchard Claude C Human Genomics Laboratory, Pennington Biomedical Research Center, Baton Rouge, Louisiana, USA. - - 2011
This article is devoted to the role of genetic variation and gene-exercise interactions in the biology of adaptation to exercise. There is evidence from genetic epidemiology research that DNA sequence differences contribute to human variation in physical activity level, cardiorespiratory fitness in the untrained state, cardiovascular and metabolic response to ...
Johnson Tyler M - - 2011
The 3-min all-out exercise test (3 MT) is purported to estimate critical power (CP), anaerobic work capacity (W'), and serve as an exercise mode for measuring maximum oxygen uptake (VO2max). Reliability analysis of the 3 MT has been confined to CP not W' and verification of 'true' VO2max was exclusive ...
Valli G - - 2011
The relationship between work rate (WR) and its tolerable duration (t(LIM)) has not been investigated at high altitude (HA). At HA (5050m) and at sea level (SL), six subjects therefore performed symptom-limited cycle-ergometry: an incremental test (IET) and three constant-WR tests (% of IET WR(max), HA and SL respectively: WR(1) ...
Requena Bernardo - - 2011
Requena, B, García, I, Requena, F, Sáez-Sáez de Villarreal, E, and Cronin, JB. Relationship between traditional and ballistic squat exercise with vertical jumping and maximal sprinting. J Strength Cond Res 25(x): 000-000, 2011-The purpose of this study was to quantify the magnitude of the relationship between vertical jumping and maximal ...
Lima M C S - - 2011
We analyzed the usefulness of a semi-tethered field running test (STR) and the relationships between indices of anaerobic power, anaerobic capacity and running performance in 9 trained male sprinters (22.2±2.9 yrs, 176±1 cm, 68.0±9.4 kg). STR involved an all out 120 m run attached to an apparatus that enabled power calculation from force and ...
Ostojic Sergej M - - 2011
The main aim of the study was to investigate whether different levels of aerobic power influence heart rate (HR) responses during the first minute of recovery following maximal exercise in athletes. Thirty-two young male soccer players were recruited for the study during the final week of their training prior the ...
Psycharakis Stelios G - - 2011
The effects of breathing on body roll have been previously investigated for the roll of the whole trunk only. The purposes of this study were: to calculate separately the shoulder roll (SR) and hip roll (HR) of swimmers during front crawl for non-breathing and preferred-side breathing conditions; to assess the ...
McMorrow R C N - - 2011
We describe a unique ambulatory closed circuit for delivering high fractions of inspired oxygen to an exercising user who does not require isolation from their environment. We describe the major components and their function and suggest potential applications for such a circuit. This circuit may benefit patients who are chronically ...
Jette Shannon - - 2011
In this article I explore the production of medical knowledge about exercise during pregnancy in the latter half of the 20th century, illustrating how debates about the safe limits of maternal exercise were rooted in longstanding anxieties surrounding the female reproductive body as well as epistemological questions concerning what counts ...
Telles Shirley - - 2011
Pre and post comparison after one minute of high frequency yoga breathing (HFYB) suggested that the HFYB modifies the autonomic status by increasing sympathetic modulation, but its effect during the practice was not assessed. Thirty-eight male volunteers with group average age ± S.D., 23.3 ± 4.4 years were each assessed ...
Toft Anders Dyhr - - 2010
The objective of this study was to use a novel and non-invasive model to explore whether: (1) exercise-induced increases in systemic levels of interleukin-6 (IL-6) and other cytokines can be ascribed to local production in working muscle; and (2) how acute release of retained blood from an exercised limb impacts ...
Knoblauch Mark A - - 2010
Circulating creatine kinase (CK) levels are often monitored as an indirect biomarker of muscle damage after resistive exercise. The purpose of the present investigation was to evaluate whether capillary whole-blood sampling, a simpler and less invasive method for obtaining a venous blood sample, would allow for a reliable measurement of ...
Taupin Philippe - - 2009
Background: The application is in the field of bioimaging and adult neurogenesis. Objective: It aims at correlating the volume of cerebral blood (CBV) in the dentate gyrus (DG) of the human hippocampus, determined by magnetic resonance imaging (MRI), with neurogenesis in the brain of adult rodents. Methods: Adult mice were ...
Altenburger Markus J - - 2009
Limited information is available on the time-dependent or dosage-dependent cariostatic efficacy of highly concentrated fluoride compounds. This good clinical practice-conforming, double-blind, placebo-controlled, crossover in situ study tested the hypothesis that a 1.0% amine fluoride fluid is superior to a 0.5% amine fluoride fluid regarding fluoride retention and mineral change in ...
Whang L M - - 2009
This study evaluated nitrification performance and microbial ecology of AOB in a full-scale biological process, powder activated carbon treatment (PACT), and a pilot-scale biological process, moving bed biofilm reactor (MBBR), treating wastewater collected from a petrochemical industry park. The petrochemical influent wastewater characteristics showed a relative low carbon to nitrogen ...
Deetae Pawinee - - 2009
The growth and aroma contribution of Microbacterium foliorum, Proteus vulgaris and Psychrobacter sp., some common but rarely mentioned cheese bacteria, were investigated in a cheese model deacidified by Debaryomyces hansenii during the ripening process. Our results show that these bacteria had distinct growth and cheese flavour production patterns during the ...
Chen Caixia - - 2008
NC0604, a new analogue of bleomycin, was isolated from fermentation broth of Streptomyces verticillus var. pingyangensis n.var. The structure of NC0604 was elucidated by spectroscopic analyses. NC0604 had the same kernel structure as bleomycin, but a different terminal amine moiety determined as amidepropyl spermidine. NC0604 exhibited antibacterial activity against a ...
Wang Yuan-Shan - - 2008
The R-amidase production by a newly isolated strain of Delftia tsuruhatensis ZJB-05174 was optimized in this paper. Effects of factors such as carbon sources, nitrogen sources, and inducers on amidase production were investigated. The medium composition was optimized using central composite designs and response surface analysis. The optimal medium components ...
Galli Jacopo - - 2008
OBJECTIVES: We assess the association between the presence of biofilms and cilial damage in patients with chronic rhinosinusitis (CRS), describe the microorganisms associated with samples that exhibited cilial loss and biofilms, and demonstrate the absence of ciliary injury and biofilms in similarly prepared "normal" controls. METHODS: We examined samples of ...
Yuan W J - - 2008
AIMS: To study fuel ethanol fermentation with Kluyveromyces marxianus ATCC8554 from Jerusalem artichoke (Helianthus tuberosus) grown in salina and irrigated with a mixture of seawater and freshwater. METHODS AND RESULTS: The growth and ethanol fermentation of K. marxianus ATCC8554 were studied using inulin as substrate. The activity of inulinase, which ...
Ali Maha Fadel Mohamed - - 2008
BACKGROUND: Because systemic treatment of psoriasis is associated with several adverse effects, methotrexate (MTX), either topically or as targeted delivery, has become a more-interesting alternative. MATERIAL/METHODS: Methotrexate liposomes (LMTX) were prepared from DPPC, soy PC, egg yolk PC, and cholesterol. We studied the characterization, formulation of hydrogel (MTX 0.25%), and ...
Jeison David - - 2009
Continuous flow experiments were performed to study the effects of acidogenic biomass development, induced by feeding with non-acidified substrate, on the operation and performance of an anaerobic membrane bioreactor (AnMBR). The AnMBR was operated at cross-flow velocities up to 1.5m/s and fed with a gelatine-starch-ethanol mixture. A significant fraction of ...
Cheng Ka Yu - - 2009
Electrochemically active bacteria in a microbial fuel cell (MFC) usually exist as a biofilm attached to an electrode surface. Conventional cyclic voltammetry using potentiostat is considered as a powerful and reliable method to study electrochemical behavior of MFC biofilm. In this paper, we introduce a new approach to evaluate redox ...
Habiba Lahdheb - - 2009
Anaerobic co-digestion of fruit and vegetable waste (FVW) and activated sludge (AS) was investigated using anaerobic sequencing batch reactors (ASBRs). The effects of AS:FVW ratio and the organic loading rate (OLR) on digesters performances were examined. The mixtures having AS:FVW ratios of 100:00, 65:35, 35:65, by a total solid (TS) ...
Slot D E - - 2008
The aim of the study was to asses the effect of the use of interdental brushes (IDB) in patients as an adjunct to toothbrushing compared with toothbrushing alone or other interdental oral hygiene devices on plaque and the clinical parameters of periodontal inflammation. MEDLINE-PubMed and the Cochrane Central register of ...
van Gastel Jan - - 2008
BACKGROUND: In the past few decades, more patients have been treated orthodontically, but no longitudinal study has compared orthodontic bands and brackets microbiologically and clinically. METHODS: This longitudinal trial (split-mouth design) included 24 patients. Microbiology (sub- and supragingival), probing depth (PD), bleeding on probing (BOP), and gingival crevicular fluid flow ...
Shah Nadeem W - - 2009
The potential for aerobic biodegradation of MTBE in a fractured chalk aquifer is assessed in microcosm experiments over 450 days, under in situ conditions for a groundwater temperature of 10 degrees C, MTBE concentration between 0.1 and 1.0 mg/L and dissolved O2 concentration between 2 and 10 mg/L. Following a ...
Ciğgin Asli S - - 2009
The study investigated effect of high influent nitrate concentration on poly-beta-hydroxybutyrate, (PHB), storage in a sequencing batch reactor, (SBR), under anoxic conditions. Acetate was fed as pulse during anoxic phase, sustained with external nitrate feeding. SBR operation involved three runs at steady state with COD/N ratios of 3.84, 2.93 and ...
Li Fa-Tang - - 2008
Photochemical oxidation of thiophene in an n-octane/acetonitrile extraction system using O(2) as oxidant was studied. Results obtained here can be used as a reference for desulfurization of gasoline, because thiophene is one of the main components containing sulfur in fluid catalytic cracking gasoline. A 500-W high-pressure mercury lamp was used ...
Novak M John - - 2008
BACKGROUND: Previous studies demonstrated significant variability in the histologic biologic width in periodontal health and mild periodontitis. The purpose of this study was to determine whether the previously established dimensions of the biologic width applied to subjects with severe, generalized, chronic periodontitis. METHODS: Twenty-eight subjects, aged 29 to 45 years, ...
Downing Leon S - - 2008
Membrane-aerated biofilms (MABs) are an effective means to achieve nitrification and denitrification of wastewater. In this research, microsensors, fluorescence in situ hybridization (FISH), and modeling were used to assess the impact of bulk liquid biological oxygen demand (BOD) concentrations on the activity and microbial community structure of nitrifying MABs. With ...
Rink Beate - - 2008
Tidal effects on the composition of free-living (FL) and particle-associated (PA) bacterial communities were studied in a tidal flat ecosystem in the southern North Sea. Denaturing gradient gel electrophoresis targeting the 16S rRNA gene and the 16S rRNA of Bacteria, Bacteroidetes, Alphaproteobacteria and the Roseobacter clade was applied. Despite strong ...
Poopal Ashwini C - - 2009
Microbial reduction of toxic Cr6+ to the less toxic Cr3+ is potentially a useful bioremediation process. Among the matrices tested for whole cell immobilization of an efficient chromate-reducing Streptomyces griseus strain, PVA-alginate was the most effective and was used for reduction of Cr(VI) in a bioreactor. Cr6+ reduction efficiency decreased ...
Naylor Andrew S - - 2008
Cranial radiation therapy is commonly used in the treatment of childhood cancers. It is associated with cognitive impairments tentatively linked to the hippocampus, a neurogenic region of the brain important in memory function and learning. Hippocampal neurogenesis is positively regulated by voluntary exercise, which is also known to improve hippocampal-dependent ...
Eganhouse Robert P - - 2008
Long-chain alkylbenzenes (LCABs) synthesized for production of alkylbenzene sulfonate surfactants have been used as molecular markers of anthropogenic waste for 25 years. Synthetic LCABs comprise two classes, the tetrapropylene-based alkylbenzenes (TABs) and the linear alkylbenzenes (LABs). LABs supplanted TABs in the mid-1960s because of improved biodegradability of their sulfonated analogs. ...
Burke C S - - 2008
The detection of oxygen in breath is of central importance to investigations of metabolism and respiration in both clinical and athletic performance monitoring applications. This paper reports the development of a portable, lightweight optical oxygen sensor that is intended to provide a breath oxygen monitoring solution that is deployable outside ...
1 2 3 4 5 6 7 8 9 10 >