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https://www.readbyqxmd.com/read/28291764/delayed-effects-of-a-low-volume-power-type-resistance-exercise-session-on-explosive-performance
#1
Athanasios Tsoukos, Panagiotis Veligekas, Lee E Brown, Gerasimos Terzis, Gregory C Bogdanis
This study examined the delayed effects of a power type training session on explosive performance. Seventeen well-trained male power and team sport athletes (age: 22.7±5.5 y, height: 181±8 cm, body mass: 80.7±8.6 kg, body fat: 9.2±1.7 %, 1-RM half-squat: 163±29 kg) performed four sessions (2 experimental and 2 control) one week apart in a randomized and counterbalanced order. Explosive performance was assessed before, 24 and 48 h following a low-volume, power-type training session (5 x 4 jump squats at 40% 1RM with 3 min rest), as well as before and after 24 and 48 h of rest (control)...
January 24, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28277422/neuromuscular-adaptations-to-short-term-high-intensity-interval-training-in-female-ice-hockey-players
#2
Juho-Ville Kinnunen, Harri Piitulainen, Jarmo M Piirainen
High-intensity interval training (HIIT) related neuromuscular adaptations, changes in force production and on-ice performance were investigated in female ice-hockey players during pre-season. Fourteen Finnish championship level ice hockey players (average age 22 ± 3 years) participated in 2½-week HIIT. Both spinal (H-reflex) and supraspinal (V-wave) neuromuscular responses of the soleus muscle were recorded before and after the training period. Static jump (SJ) and countermovement jump (CMJ) heights, plantar flexor maximal voluntary contraction (MVC) and rate of force development (RFD) were measured...
March 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28269975/effects-of-detraining-on-neuromuscular-performance-in-a-selected-group-of-elite-women-pole-vaulters-a-case-study
#3
Irineu Loturco, Lucas A Pereira, Ronaldo Kobal, Henrique C Martins, Katia Kitamura, Cesar C Abad, Fabio Y Nakamura
The aim of this paper was to determine the effects of 28 days of inactivity on neuromuscular performance of elite women pole-vaulters. Four athletes undertook measurements of rate of force development (RFD), unloaded and loaded vertical jump tests, drop jumps and a 45 m sprint test before and after a transition period of planned inactivity. The RFD, the ability to accelerate over very short distances (5 m) and sprinting capacity improved after training cessation. Acceleration over longer distances (5-45 m) was impaired, while unloaded and loaded vertical jump tests suffered trivial to small changes...
April 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28240708/movement-patterns-and-muscle-damage-during-simulated-rugby-sevens-matches-in-national-team-players
#4
Lucas A Pereira, Fábio Y Nakamura, José E Moraes, Katia Kitamura, Solange P Ramos, Irineu Loturco
The aim of this study was to analyze the match performance (i.e., distance covered in different intensities), signs of muscle damage (assessed by means of creatine kinase [CK] activity and rate of force development [RFD]), and neuromuscular fatigue (using linear sprint and vertical jump performances) following three single-day simulated matches performed by rugby sevens players from the Brazilian National Team. Ten male rugby sevens players (25.2 ± 3.6 years; 88.7 ± 7.1 kg; 182.2 ± 6.3 cm) participated in this study...
February 23, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28190611/legacy-and-alternative-flame-retardants-in-norwegian-and-uk-indoor-environment-implications-of-human-exposure-via-dust-ingestion
#5
Katerina Kademoglou, Fuchao Xu, Juan Antonio Padilla-Sanchez, Line Småstuen Haug, Adrian Covaci, Chris D Collins
Indoor dust has been acknowledged as a major source of flame retardants (FRs) and dust ingestion is considered a major route of exposure for humans. In the present study, we investigated the presence of PBDEs and alternative FRs such as emerging halogenated FRs (EHFRs) and organophosphate flame retardants (PFRs) in indoor dust samples from British and Norwegian houses as well as British stores and offices. BDE209 was the most abundant PBDE congener with median concentrations of 4700ngg(-1) and 3400ngg(-1) in UK occupational and house dust, respectively, 30 and 20 fold higher than in Norwegian house dust...
February 9, 2017: Environment International
https://www.readbyqxmd.com/read/28188053/exposure-of-portuguese-children-to-the-novel-non-phthalate-plasticizer-di-iso-nonyl-cyclohexane-1-2-dicarboxylate-dinch
#6
Luísa Correia-Sá, André Schütze, Sónia Norberto, Conceição Calhau, Valentina F Domingues, Holger M Koch
Di-(iso-nonyl)-cyclohexane-1,2-dicarboxylate (DINCH) is used as substitute for high molecular weight phthalate plasticizers such as di-(2-ethylhexyl) phthalate (DEHP) and di-(iso-nonyl) phthalate (DINP). Due to a rapid substitution process, we must assume omnipresent and increasing DINCH exposures. The aim of this study was to evaluate DINCH exposure in 112 children (4-18years old) from Portugal, divided in two groups: 1) normal-/underweight following the usual diet; and 2) obese/overweight but under strict nutritional guidance...
February 7, 2017: Environment International
https://www.readbyqxmd.com/read/28039869/effects-of-implicit-theories-of-ability-and-stereotype-inconsistent-information-on-handgrip-strength-in-older-adults-a-regulatory-fit-perspective
#7
Mélanie Emile, Aina Chalabaev, Serge S Colson, Jerome Vaulerin, Charlene Falzon, Fabienne D'Arripe-Longueville
This study examined whether stereotype-inconsistent information interacts with implicit theories of ability to affect handgrip strength in older adults. Eighty-two retired older adults (13 men and 69 women) from 61 to 89 years old (Mage = 75.8 years; SD = 6.9) performed maximum voluntary contractions (MVC) during a handgrip task in a design manipulating implicit theories of ability and stereotype-inconsistent information related to physical decline with aging. Participants were randomly assigned to one of three groups: incremental condition, entity condition, or control group...
December 31, 2016: Psychophysiology
https://www.readbyqxmd.com/read/28007419/child-and-adult-exposure-and-health-risk-evaluation-following-the-use-of-metal-and-metalloid-containing-costume-cosmetics-sold-in-the-united-states
#8
COMPARATIVE STUDY
Angela L Perez, Melanie Nembhard, Andrew Monnot, Daniel Bator, Elizabeth Madonick, Shannon H Gaffney
Costume cosmetics (lipstick, body paints, eyeshadow) were analyzed for metals using inductively coupled plasma mass spectrometry (ICP-MS). Sb was detected in all samples (range: 0.12-6.3 mg/kg; d.f. 100%), followed by Pb (<0.15-9.3 mg/kg), Ni (<0.20-6.3 mg/kg), Co (<0.5-2.0 mg/kg); with d.f. 80% each, Hg (<0.00015-0.0020 mg/kg; d.f. 50%) and As (0.53 mg/kg, d.f. 10%). Ingestion and dermal exposures were estimated for child- and adult-intermittent and adult-occupational users. Adult-occupational users exceeded the U...
March 2017: Regulatory Toxicology and Pharmacology: RTP
https://www.readbyqxmd.com/read/28002178/effect-of-different-onset-thresholds-on-isometric-mid-thigh-pull-force-time-variables
#9
Thomas Dos'Santos, Paul A Jones, Paul Comfort, Christopher Thomas
Various thresholds have been used to identify the onset of contraction during isometric mid-thigh pull (IMTP) however, no agreed onset threshold exists for this assessment. The purpose of this study was to compare relative body weight (BW) and arbitrary onset thresholds to a criterion onset threshold 5 SD of BW for IMTP force-time variables; force at each threshold, peak force (PF), time-specific force values (100, 150 and 200 ms) and rate of force development (RFD) during 0-100 ms, 0-150 ms, 0-200 ms. Academy rugby league players (n = 9, age: 18...
December 8, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28000685/update-on-dietary-intake-of-perchlorate-and-iodine-from-u-s-food-and-drug-administration-s-total-diet-study-2008-2012
#10
Eileen Abt, Judith Spungen, Régis Pouillot, Margaret Gamalo-Siebers, Mark Wirtz
The U.S. Food and Drug Administration's (FDA) Total Diet Study (TDS) monitors the US food supply for pesticide residues, industrial chemicals, radionuclides, nutrients, and toxic elements. Perchlorate and iodine intakes based on concentrations in TDS samples collected between 2008 and 2012 were estimated in order to update an earlier TDS dietary assessment. Perchlorate is used as an oxidizing agent in rocket and missile fuel, is formed naturally in the atmosphere, and occurs naturally in some soils. Because of perchlorate's presence in soil, and in irrigation, processing, and source water, it is widely found in food...
December 21, 2016: Journal of Exposure Science & Environmental Epidemiology
https://www.readbyqxmd.com/read/27990224/the-relationship-between-aerobic-and-anaerobic-performance-in-recreational-runners
#11
Zachary M Gillen, Frank B Wyatt, Jason B Winchester, Dalton A Smith, Vidhi Ghetia
Research has indicated that combined aerobic and anaerobic training (concurrent training) may improve aerobic performance greater than aerobic training alone. The purpose of this investigation was to establish any associations between aerobic and anaerobic performance. Eleven participants (n = 11, age = 34.1 ± 13 years, VO2max = 58.4 ± 7.8) volunteered for this study. Participants were asked for endurance training experience (4.7 ± 3.7 years) and resistance training experience (4.1 ± 4.6 years). To meet training status, participants were to have a VO2max in the 80(th) percentile as per ACSM guidelines...
2016: International Journal of Exercise Science
https://www.readbyqxmd.com/read/27979682/evaluating-spatial-distribution-and-seasonal-variation-of-phthalates-using-passive-air-sampling-in-southern-india
#12
Srimurali Sampath, Krishna Kumar Selvaraj, Govindaraj Shanmugam, Vimalkumar Krishnamoorthy, Paromita Chakraborty, Babu Rajendran Ramaswamy
Usage of phthalates as plasticizers has resulted in worldwide occurrence and is becoming a serious concern to human health and environment. However, studies on phthalates in Indian atmosphere are lacking. Therefore, we studied the spatio-temporal trends of six major phthalates in Tamil Nadu, southern India, using passive air samplers. Phthalates were ubiquitously detected in all the samples and the average total phthalates found in decreasing order is pre-monsoon (61 ng m(-3)) > summer (52 ng m(-3)) > monsoon (17 ng m(-3))...
February 2017: Environmental Pollution
https://www.readbyqxmd.com/read/27976985/analysis-of-elbow-muscle-strength-parameters-in-brazilian-jiu-jitsu-practitioners
#13
Bruno Follmer, Rodolfo André Dellagrana, Luis Antonio Pereira de Lima, Walter Herzog, Fernando Diefenthaeler
Upper-body dynamic and isometric maximum strength are essential components for success in Brazilian jiu-jitsu (BJJ). This study was aimed at analysing strength parameters in the elbow flexor and extensor muscles of BJJ practitioners. Participants (n = 28) performed maximum isometric contractions of elbow flexors and extensors to determine peak torque (PT), rate of force development (RFD), and the torque-angle (T-A) relationship at elbow angles of 45°, 60°, 75°, 90°, 105°, and 120°. Additionally, concentric and eccentric PTs were measured at 1...
December 15, 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/27937970/effects-of-oncoming-target-velocities-on-rapid-force-production-and-accuracy-of-force-production-intensity-and-timing
#14
Yoichi Ohta
The present study aimed to clarify the effects of oncoming target velocities on the ability of rapid force production and accuracy and variability of simultaneous control of both force production intensity and timing. Twenty male participants (age: 21.0 ± 1.4 years) performed rapid gripping with a handgrip dynamometer to coincide with the arrival of an oncoming target by using a horizontal electronic trackway. The oncoming target velocities were 4, 8, and 12 m · s(-1), which were randomly produced. The grip force required was 30% of the maximal voluntary contraction...
December 12, 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/27919481/effect-of-slow-release-fampridine-on-muscle-strength-rate-of-force-development-functional-capacity-and-cognitive-function-in-an-enriched-population-of-ms-patients-a-randomized-double-blind-placebo-controlled-study
#15
RANDOMIZED CONTROLLED TRIAL
H B Jensen, J L Nielsen, M Ravnborg, U Dalgas, P Aagaard, E Stenager
DESIGN: This study was conducted as a randomized, double blind, placebo-controlled parallel group trial preceded by open label enrichment phase. OBJECTIVES: The objectives of this study were 1) to examine the effect of SR-Fampridine treatment on muscle strength in terms of maximal voluntary contraction (MVC) and rate of force development (RFD) of the lower extremities and 2) to replicate previously published data on the effect of slow release-Fampridine (SR-Fampridine) on the functional capacity of the lower limbs, the upper limb and cognitive function, in persons with multiple sclerosis (pwMS)...
November 2016: Multiple Sclerosis and related Disorders
https://www.readbyqxmd.com/read/27914867/new-hbm-values-for-emerging-substances-inventory-of-reference-and-hbm-values-in-force-and-working-principles-of-the-german-human-biomonitoring-commission
#16
REVIEW
Petra Apel, Jürgen Angerer, Michael Wilhelm, Marike Kolossa-Gehring
The German Human Biomonitoring Commission (HBM Commission) derives health-related guidance values (Human Biomonitoring assessment values, HBM values) according to the procedures described in the HBM Commission's position papers. Since the last adaption of the methodology in 2014, the HBM Commission has established a series of new HBM values, mainly on the basis of internationally agreed TDI/RfD values, or of toxicologically well- founded points of departure observed in animal studies. The derivation of these new HBM values for HBCDD, triclosan, 2-MBT, PFOA and PFOS as well as for the metabolites of glycol ethers, of Hexamoll(®) DINCH(®), DPHP, DEHTP, NMP, NEP, and 4-MBC is specified, and the HBM values are presented together with already established HBM values for other substances...
September 17, 2016: International Journal of Hygiene and Environmental Health
https://www.readbyqxmd.com/read/27872654/chlorophyll-a-fluorescence-under-half-of-the-adaptive-growth-irradiance-for-high-throughput-sensing-of-leaf-water-deficit-in-arabidopsis-thaliana-accessions
#17
Kumud B Mishra, Anamika Mishra, Kateřina Novotná, Barbora Rapantová, Petra Hodaňová, Otmar Urban, Karel Klem
BACKGROUND: Non-invasive and high-throughput monitoring of drought in plants from its initiation to visible symptoms is essential to quest drought tolerant varieties. Among the existing methods, chlorophyll a fluorescence (ChlF) imaging has the potential to probe systematic changes in photosynthetic reactions; however, prerequisite of dark-adaptation limits its use for high-throughput screening. RESULTS: To improve the throughput monitoring of plants, we have exploited their light-adaptive strategy, and investigated possibilities of measuring ChlF transients under low ambient irradiance...
2016: Plant Methods
https://www.readbyqxmd.com/read/27867393/melatonin-application-to-pisum-sativum-l-seeds-positively-influences-the-function-of-the-photosynthetic-apparatus-in-growing-seedlings-during-paraquat-induced-oxidative-stress
#18
Katarzyna Szafrańska, Russel J Reiter, Małgorzata M Posmyk
Melatonin, due to its pleiotropic effects plays an important role improving tolerance to stresses. Plants increase endogenous melatonin synthesis when faced with harsh environments as well as exogenously applied melatonin limits stress injuries. Presented work demonstrated that single melatonin application into the seeds during pre-sowing priming improved oxidative stress tolerance of growing seedlings exposed to paraquat (PQ). PQ is a powerful herbicide which blocks the process of photosynthesis under light conditions due to free radicals excess production, when O2 is rapidly converted to [Formula: see text] and subsequently to other reactive oxygen species...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27857692/endurance-training-intensity-does-not-mediate-interference-to-maximal-lower-body-strength-gain-during-short-term-concurrent-training
#19
Jackson J Fyfe, Jonathan D Bartlett, Erik D Hanson, Nigel K Stepto, David J Bishop
We determined the effect of concurrent training incorporating either high-intensity interval training (HIT) or moderate-intensity continuous training (MICT) on maximal strength, counter-movement jump (CMJ) performance, and body composition adaptations, compared with single-mode resistance training (RT). Twenty-three recreationally-active males (mean ± SD: age, 29.6 ± 5.5 y; [Formula: see text], 44 ± 11 mL kg(-1)·min(-1)) underwent 8 weeks (3 sessions·wk(-1)) of either: (1) HIT combined with RT (HIT+RT group, n = 8), (2) work-matched MICT combined with RT (MICT+RT group, n = 7), or (3) RT performed alone (RT group, n = 8)...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27834827/mercury-exposure-in-children-of-the-wanshan-mercury-mining-area-guizhou-china
#20
Buyun Du, Ping Li, Xinbin Feng, Guangle Qiu, Jun Zhou, Laurence Maurice
To evaluate the mercury (Hg) exposure level of children located in a Hg mining area, total Hg concentrations and speciation were determined in hair and urine samples of children in the Wanshan Hg mining area, Guizhou Province, China. Rice samples consumed by these same children were also collected for total mercury (THg) and methyl-mercury (MeHg) analysis. The geometric mean concentrations of THg and MeHg in the hair samples were 1.4 (range 0.50-6.0) μg/g and 1.1 (range 0.35-4.2) μg/g, respectively, while the geometric mean concentration of urine Hg (UHg) was 1...
November 8, 2016: International Journal of Environmental Research and Public Health
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