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https://www.readbyqxmd.com/read/29102831/bilateral-deficit-in-explosive-force-related-to-sit-to-stand-performance-in-older-postmenopausal-women
#1
J D Ruiz-Cárdenas, J J Rodríguez-Juan, J M Jakobi, J Ríos-Díaz, E Marín-Cascales, J A Rubio-Arias
The purpose of this study was to determine whether the bilateral deficit (BLD) for maximal voluntary force (MVF) and rate of force development (RFD) influences sit-to-stand in older postmenopausal women. Fourteen women performed unilateral and bilateral maximal voluntary contractions during isometric leg-extension. The MVF and RFD over consecutive 50ms periods (0-50, 50-100 and 100-150ms) after force onset and the time to sit-to-stand test were calculated. There was only a BLD for RFD 0-50ms and 50-100ms. The time of sit-to-stand was moderately correlated to BLD for RFD 0-50ms (r=0...
October 31, 2017: Archives of Gerontology and Geriatrics
https://www.readbyqxmd.com/read/29073840/a-novel-apparatus-measuring-knee-flexor-strength-during-various-hamstring-exercises-a-reliability-and-retrospective-study
#2
Jack T Hickey, Peter F Hickey, Nirav Maniar, Ryan G Timmins, Morgan D Williams, Christian A Pitcher, David A Opar
Study Design Reliability and case-control injury study. Background Knee flexor strength is a key variable when dealing with hamstring strain injury (HSI) and methodologies of objective measurement are often limited to single exercises. Objectives To establish test re-test reliability of a novel apparatus measuring knee flexor strength during various hamstring exercises; to investigate whether these measures detect between-leg differences in males with and without history of unilateral HSI. Methods Twenty males without and ten males with previous unilateral HSI participated...
October 26, 2017: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/29065077/optimizing-half-squat-postactivation-potential-load-in-squat-jump-training-for-eliciting-relative-maximal-power-in-ski-jumpers
#3
Artur Gołaś, Michal Wilk, Petr Stastny, Adam Maszczyk, Katarzyna Pajerska, Adam Zając
Gołaś, A, Wilk, M, Stastny, P, Maszczyk, A, Pajerska, K, and Zając, A. Optimizing half squat postactivation potential load in squat jump training for eliciting relative maximal power in ski jumpers. J Strength Cond Res 31(11): 3010-3017, 2017-Training load manipulation in a single workout session can increase or decrease training effectiveness in terms of athletes' strength or power gains. In ski jumping, the complex training that elicits maximal power gains may take advantage of the postactivation potentiation (PAP) mechanism...
November 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29064740/organophosphorus-flame-retardants-pfrs-and-phthalates-in-floor-and-road-dust-from-a-manual-e-waste-dismantling-facility-and-adjacent-communities-in-thailand
#4
Dudsadee Muenhor, Hyo-Bang Moon, Sunggyu Lee, Emma Goosey
This study was undertaken to investigate levels of organophosphorus flame retardants (PFRs) and phthalates in floor and road dust from a manual e-waste dismantling facility and nearby communities in Thailand. Concentrations of Σ10 PFRs and Σ6 phthalates in floor dust from the facility were approximately 36-1,700 and 86,000-790,000 ng g(-1), whereas those from the communities were about 13-9,200 and 44,000-2,700,000 ng g(-1), respectively. The highest content of Σ10 PFRs (9,200 ng g(-1)) and Σ6 phthalates (2,700,000 ng g(-1)) in indoor dust was both detected in the dust sampled from a house with no prevailing winds located 350 m northeast of the facility...
October 24, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/29064106/integration-of-mechanistic-and-pharmacokinetic-information-to-derive-oral-reference-dose-and-margin-of-exposure-values-for-hexavalent-chromium
#5
Chad M Thompson, Christopher R Kirman, Sean M Hays, Mina Suh, Seneca E Harvey, Deborah M Proctor, Julia E Rager, Laurie C Haws, Mark A Harris
The current US Environmental Protection Agency (EPA) reference dose (RfD) for oral exposure to chromium, 0.003 mg kg(-1)  day(-1) , is based on a no-observable-adverse-effect-level from a 1958 bioassay of rats exposed to ≤25 ppm hexavalent chromium [Cr(VI)] in drinking water. EPA characterizes the confidence in this RfD as "low." A more recent cancer bioassay indicates that Cr(VI) in drinking water is carcinogenic to mice at ≥30 ppm. To assess whether the existing RfD is health protective, neoplastic and non-neoplastic lesions from the 2 year cancer bioassay were modeled in a three-step process...
October 24, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/29062193/application-of-radio-frequency-based-digital-thermometer-for-real-time-monitoring-of-dairy-cattle-rectal-temperature
#6
Tridib Debnath, Santanu Bera, Suman Deb, Prasenjit Pal, Nibash Debbarma, Avijit Haldar
AIM: Dairy cattle health monitoring program becomes vital for detecting the febrile conditions to prevent the outbreak of the animal diseases as well as ensuring the fitness of the animals that are directly affecting the health of the consumers. The aim of this study was to validate real-time rectal temperature (RT) data of radio frequency based digital (RFD) thermometer with RT data of mercury bulb (MB) thermometer in dairy cattle. MATERIALS AND METHODS: Two experiments were conducted...
September 2017: Veterinary World
https://www.readbyqxmd.com/read/29055583/risk-assessment-for-phthalate-exposures-in-the-elderly-a-repeated-biomonitoring-study
#7
Jin Hee Kim, Seungho Lee, Mi-Yeon Shin, Kyoung-Nam Kim, Yun-Chul Hong
Recent studies indicated that exposure to phthalates affects the development of a variety of diseases in the elderly population. However, limited information was available about the variability of phthalate daily intakes (DIs) and the proportion of the population that is highly exposed to phthalates. Therefore, we measured the levels of three phthalate metabolites, mono-(2-ethyl-5-hydroxyhexyl) phthalate (MEHHP), mono-(2-ethyl-5-oxohexyl) phthalate (MEOHP), and mono-n-butyl phthalate (MnBP) in 4014 urine samples repeatedly collected from 1646 elderly people...
October 18, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29017410/effects-of-knee-position-on-the-reliability-and-production-of-maximal-and-rapid-strength-characteristics-during-an-isometric-squat-test
#8
Ty B Palmer, Jose G Pineda, Rachel M Durham
This study aimed to examine the effects of knee position on the reliability and production of peak force (PF) and rate of force (RFD) development characteristics during an isometric squat. Fourteen resistance-trained females performed isometric squats at 90, 120, and 150° knee angles (corresponding to parallel, half, and quarter squat positions, respectively) on two different occasions, from which PF, peak RFD, and early (RFD30,RFD50,RFD100) and late (RFD200) phase RFD variables were extracted. PF and RFD200 were highly consistent across trials for all three squat positions, with intraclass correlation coefficients (ICCs) ranging between 0...
October 10, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/29017022/isometric-parameters-in-the-monitoring-of-maximal-strength-power-and-hypertrophic-resistance-training
#9
Heikki Peltonen, Simon Walker, Anuliisa Lähitie, Keijo Häkkinen, Janne Avela
This study monitored strength-training adaptations via isometric parameters throughout 2×10 weeks of hypertrophic (HYP I+II) or 10 weeks maximum strength (MS) followed by 10 weeks power (P) training with untrained controls. Previously untrained men performed bilateral isometric leg press tests analyzed for peak force (MVC) and rate of force development (RFD) every 3.5-week. These parameters were compared to dynamic performance, voluntary and electrically-induced isometric contractions, muscle activity and cross-sectional area (CSA) in the laboratory before and after 10 and 20 weeks...
October 10, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29016477/shod-versus-barefoot-effects-on-force-and-power-development-during-a-conventional-deadlift
#10
Mark E Hammer, Rudi A Meir, John W Whitting, Zachary J Crowley-McHattan
The kinetics of a conventional deadlift in shod (S) versus unshod (US) footwear conditions in 10 male participants (mean ± SD, age = 27.0 ± 5.8 years; weight = 78.7 ± 11.5 kg; height = 175.8 ± 8.2 cm; 1RM deadlift = 155.8 ± 25.8 kg) was assessed in two testing sessions. A counterbalanced, crossover experimental design was used with different loads (60% and 80% 1RM). Four sets of four repetitions were prescribed per session with two sets per shoe and with each shoe condition involving one set per load. Peak vertical force (PF), rate of force development (RFD), time to peak force (TPF), anterior-posterior (COP-AP) and medio-lateral (COP-ML) center of pressure excursion, and barbell peak power (PP) data were recorded during all repetitions...
October 7, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28986991/occurrence-and-distribution-of-organophosphate-ester-flame-retardants-in-indoor-dust-and-their-potential-health-exposure-risk
#11
Xiangying Zeng, Yang Wu, Zhiyang Liu, Shutao Gao, Zhiqiang Yu
The occurrence and distribution of ten organophosphate ester (OP) flame retardants/plasticizers were studied in indoor dust collected in two districts of Wuhan City. Total concentrations of the 10 OPs (ΣOPs) varied in the range of 86.5-6389 ng/g in 26 dust samples in Caidian District (CD), and 300-10186 ng/g and in 27 samples in Jiang'an District (JA), respectively. In most dust samples Tris(2-chloroethyl) phosphate (TCEP) was dominant over the other OPs, with a concentration of 9.14-2722 ng/g (mean value of 388 ng/g) in CD, and 57...
October 7, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28985601/a-risk-based-approach-for-developing-standards-for-irrigation-with-reclaimed-water
#12
Mads Troldborg, Dominic Duckett, Richard Allan, Emily Hastings, Rupert L Hough
A generalised quantitative risk assessment (QRA) is developed to assess the potential harm to human health resulting from irrigation with reclaimed water. The QRA is conducted as a backward calculation starting from a pre-defined acceptable risk level at the receptor point (defined as an annual infection risk of 10(-4) for pathogens and by reference doses (RfD) for chemical hazards) and results in an estimate of the corresponding acceptable concentration levels of the given hazards in the effluent. In this way the QRA is designed to inform the level of water treatment required to achieve an acceptable risk level and help establish reclaimed water quality standards...
December 1, 2017: Water Research
https://www.readbyqxmd.com/read/28972854/the-effect-of-milk-on-recovery-from-repeat-sprint-cycling-in-female-team-sport-athletes
#13
Paula Rankin, Michael J Lawlor, Frank A Hills, Phillip G Bell, Emma J Stevenson, Emma Cockburn
The consumption of milk post-eccentric exercise attenuates the effects of muscle damage in team-sport athletes. However, participation in team sport involves both concentric-eccentric loading and metabolic stress. Therefore, the aim of this study was to investigate the effects of post-exercise milk consumption on recovery from a cycling protocol designed to simulate the metabolic demands of team sport. Ten female team-sport athletes participated in a randomised cross-over investigation. Upon completion of the protocol participants consumed 500ml of milk (MILK) or 500ml of an energy-matched carbohydrate (CHO) drink...
October 3, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28956089/toxicokinetic-of-tris-2-butoxyethyl-phosphate-tboep-in-humans-following-single-oral-administration
#14
Wolfgang Völkel, Veronika Fuchs, Mandy Wöckner, Hermann Fromme
Tris(2-butoxyethyl) phosphate (TBOEP; 20 µg/kg b.w.) was orally administered to three female and three male volunteers. In urine samples collected for 39 h three metabolites of TBOEP were quantitated. bis(2-butoxyethyl) phosphate (BBOEP), tris(2-(3-hydroxy)butoxyethyl) phosphate (OH-TBOEP), bis(2-butoxyethyl)-(2-hydroxyethyl) phosphate (BBOEHEP) were observed in all urine samples within the first 7 h with highest concentration for BBOEHEP. C max of OH-TBOEP was in the range of 2-4 h and t 1/2 was between 1...
September 27, 2017: Archives of Toxicology
https://www.readbyqxmd.com/read/28949273/reliability-of-a-commercially-available-and-algorithm-based-kinetic-analysis-software-compared-to-manual-based-software
#15
Kevin M Carroll, John P Wagle, Kimitake Sato, Brad H DeWeese, Satoshi Mizuguchi, Michael H Stone
There is a need for reliable analysis techniques for kinetic data for coaches and sport scientists who employ athlete monitoring practices. The purpose of the study was: (1) to determine intra- and inter-rater reliability within a manual-based kinetic analysis program; and (2) to determine test-retest reliability of an algorithm-based kinetic analysis program. Five independent raters used a manual analysis program to analyse 100 isometric mid-thigh pull (IMTP) trials obtained from previously collected data...
September 26, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28945641/four-weeks-of-finger-grip-training-increases-the-rate-of-force-development-and-the-maximal-force-in-elite-and-world-top-ranking-climbers
#16
Guillaume Levernier, Guillaume Laffaye
The goal of this study was to assess the impact of a specific four-week training program on finger grip in climbers; specifically, on the maximal force and the rate of force development (RFD) of finger muscles in isometric contraction. The participants were 14 French male rock climbers who took part in national and international bouldering competitions (at world-ranking and elite levels). They were divided into two samples. The experimental group performed a specific four-week training program that included such exercises as suspensions on small holds at the rate of three times a week...
September 19, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28942233/comparison-of-radiation-doses-imparted-during-128-256-384-multislice-ct-scanners-and-cone-beam-computed-tomography-for-intra-and-perioperative-cochlear-implant-assessment
#17
N Guberina, U Dietrich, D Arweiler-Harbeck, M Forsting, A Ringelstein
PURPOSE: To examine radiation-doses imparted during multislice (MSCT) and cone-beam computed-tomography (CBCT) for perioperative examination of cochlear-implant insertion. METHODS: Radiation-doses were assessed during standardized petrous-bone CT-protocols at different MSCT ((I) single-source CT-scanner Somatom-Definition-AS+, (II) 2nd generation of dual-source CT-scanner Somatom-Definition-Flash, (III) 3rd generation of dual-source CT-scanner Somatom-Force and at the CBCT Ziehm-Vision-RFD3D ((IV) (a) RFD-3D (Standard-modifier), (b) RFD-3D (Low-dose-modifier))...
September 19, 2017: American Journal of Otolaryngology
https://www.readbyqxmd.com/read/28933711/the-effect-of-hip-joint-angle-on-isometric-midthigh-pull-kinetics
#18
Thomas DosʼSantos, Christopher Thomas, Paul A Jones, John J McMahon, Paul Comfort
The aim of this study were to compare isometric midthigh pull (IMTP) peak force (PF), time-specific force values (100-, 150-, and 200 ms), rate of force development (RFD) at predetermined time bands (0-100, 0-150, and 0-200 ms) and net forces between 2 commonly adopted hip joint angles (145°[hip145] and 175°[hip175]) with a 145° standardized knee angle. Twenty-eight collegiate athletes (age: 21.7 ± 1.5 years, height: 1.75 ± 0.08 m, mass: 81.5 ± 8.4 kg) performed 2 IMTP trials at each hip joint angle in a randomized counterbalanced order...
October 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28912726/cardiovascular-and-muscular-consequences-of-work-matched-interval-type-of-concentric-and-eccentric-pedaling-exercise-on-a-soft-robot
#19
Martin Flück, Rebekka Bosshard, Max Lungarella
Eccentric types of endurance exercise are an acknowledged alternative to conventional concentric types of exercise rehabilitation for the cardiac patient, because they reduce cardiorespiratory strain due to a lower metabolic cost of producing an equivalent mechanical output. The former contention has not been tested in a power- and work-matched situation of interval-type exercise under identical conditions because concentric and eccentric types of exercise pose specific demands on the exercise machinery, which are not fulfilled in current practice...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28903490/estimating-methylmercury-intake-for-the-general-population-of-south-korea-using-physiologically-based-pharmacokinetic-modeling
#20
Seungho Lee, Yu-Mei Tan, Martin B Phillips, Jon R Sobus, Sungkyoon Kim
The Korean National Environmental Health Survey (KoNEHS 2009-2011) tracks levels of environmental pollutants in biological samples from the adult Korean population (age 19-88). Recent survey results for blood mercury (Hg) suggest some exceedance above existing blood Hg reference levels. Because total blood Hg represents both organic and inorganic forms, and methylmercury (MeHg) has been specifically linked to several adverse health outcomes, a need exists to quantify MeHg intake for this population. Gender, age, and frequency of fish consumption were first identified as important predictors of KoNEHS blood Hg levels using generalized linear models...
September 1, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
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