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Reactive strength index

Susannah L Woodd, Paul Kelly, John R Koethe, George Praygod, Andrea M Rehman, Molly Chisenga, Joshua Siame, Douglas C Heimburger, Henrik Friis, Suzanne Filteau
BACKGROUND: A substantial proportion of HIV-infected adults starting antiretroviral therapy (ART) in sub-Saharan Africa are malnourished. We aimed to increase understanding of the factors affecting their high mortality, particularly in the high-risk period before ART initiation. METHODS: We analysed potential risk factors for mortality of Zambian and Tanzanian participants enrolled in the NUSTART clinical trial. Malnourished adults (n = 1815; body mass index [BMI] <18...
October 12, 2016: BMC Infectious Diseases
Konstantina Dipla, Areti Triantafyllou, Iris Grigoriadou, Evangelia Kintiraki, Georgios A Triantafyllou, Pavlos Poulios, Ioannis S Vrabas, Andreas Zafeiridis, Stella Douma, Dimitrios G Goulis
AIMS/HYPOTHESIS: Gestational diabetes mellitus (GDM) is a risk factor for the development of endothelial dysfunction and cardiovascular disease. However, in vivo microvascular endothelial function in GDM has not been investigated. This study aimed to examine, using near-infrared spectroscopy (NIRS), whether: (1) there are differences in microvascular reactivity and skeletal muscle oxygen consumption (m[Formula: see text]) at rest and during exercise between GDM and uncomplicated pregnancies; and (2) there is an association of NIRS indices with macrovascular function and cardiovascular disease risk factors...
October 8, 2016: Diabetologia
Liséte Celina Lange, Alison Frederico Medeiros Ferreira
This study assessed the effects of adding plastics and waste vegetable oil on the quality of coke in the coking process, on a pilot scale. A typical composition of the main plastics found in municipal solid waste was prepared using 33% HDPE, 5% LDPE, 10% PP, 21% PET, 24.8% PS, 5.2% PVC, 1% cellulose and also a 0.5% waste vegetable oil was added. The wastes were added to the coal blends in the proportions of 1%, 2% and 3% for plastics and 0.5% for vegetable oil. Two types of experiments were performed. The first was carried out in a hearth heating furnace (HHF) at temperatures of up to 900°C for a 7 h period...
September 19, 2016: Waste Management
Kris Beattie, Brian P Carson, Mark Lyons, Ian C Kenny
Maximum- and reactive-strength qualities both have important roles in athletic movements and sporting performance. Very little research has investigated the relationship between maximum-strength and reactive-strength. The aim of this study was to investigate the relationship between maximum-strength (isometric mid-thigh pull peak force; IMTP PF) and reactive-strength (drop-jump reactive-strength index; DJ-RSI) variables at 0.3 m, 0.4 m, 0.5 m and 0.6 m box heights. A secondary aim investigated the between- and within-group differences in reactive-strength characteristics between relatively 'strong' and 'weak' athletes...
September 6, 2016: International Journal of Sports Physiology and Performance
Busra Can, Ozgur Kara, Muhammet Cemal Kizilarslanoglu, Gunes Arik, Gozde Sengul Aycicek, Fatih Sumer, Ramazan Civelek, Canan Demirtas, Zekeriya Ulger
BACKGROUND: Sarcopenia is a geriatric syndrome characterized by the presence of low muscle mass and function. Possible mechanisms underlying sarcopenia include oxidative stress and elevation of inflammatory cytokines. AIMS: The aim of the study was to evaluate the relationship between sarcopenia and biomarkers that may be involved in its pathogenesis and hence early detection. METHODS: A total of 72 patients (36 sarcopenic and 36 non-sarcopenic) were included in the study...
August 29, 2016: Aging Clinical and Experimental Research
F Rosas, R Ramirez-Campillo, D Diaz, F Abad-Colil, C Martinez-Salazar, A Caniuqueo, R Cañas-Jamet, I Loturco, F Y Nakamura, C McKenzie, J Gonzalez-Rivera, J Sanchez-Sanchez, M Izquierdo
The aim of this study was to compare the effects of a jump training program, with or without haltere type handheld loading, on maximal intensity exercise performance. Youth soccer players (12.1±2.2 y) were assigned to either a jump training group (JG, n=21), a jump training group plus haltere type handheld loading (LJG, n=21), or a control group following only soccer training (CG, n=21). Athletes were evaluated for maximal-intensity performance measures before and after 6 weeks of training, during an in-season training period...
August 24, 2016: International Journal of Sports Medicine
Tom Clifford, Bram Berntzen, Gareth W Davison, Daniel J West, Glyn Howatson, Emma J Stevenson
This study examined the effects of beetroot juice (BTJ) on recovery between two repeated-sprint tests. In an independent groups design, 20 male, team-sports players were randomized to receive either BTJ or a placebo (PLA) (2 × 250 mL) for 3 days after an initial repeated sprint test (20 × 30 m; RST1) and after a second repeated sprint test (RST2), performed 72 h later. Maximal isometric voluntary contractions (MIVC), countermovement jumps (CMJ), reactive strength index (RI), pressure-pain threshold (PPT), creatine kinase (CK), C-reactive protein (hs-CRP), protein carbonyls (PC), lipid hydroperoxides (LOOH) and the ascorbyl free radical (A(•-)) were measured before, after, and at set times between RST1 and RST2...
August 18, 2016: Nutrients
Irene Jansen, Matthias Prager, Luzia Valentini, Carsten Büning
Malnutrition is a frequent feature in Crohn's disease (CD), affects patient outcome and must be recognised. For chronic inflammatory diseases, recent guidelines recommend the development of combined malnutrition and inflammation risk scores. We aimed to design and evaluate a new screening tool that combines both malnutrition and inflammation parameters that might help predict clinical outcome. In a prospective cohort study, we examined fifty-five patients with CD in remission (Crohn's disease activity index (CDAI) <200) at 0 and 6 months...
September 2016: British Journal of Nutrition
Hunkyung Kim, Miji Kim, Narumi Kojima, Ken Fujino, Erika Hosoi, Hisamine Kobayashi, Shinji Somekawa, Yoshifumi Niki, Yukari Yamashiro, Hideyo Yoshida
OBJECTIVES: To investigate the effects of exercise and/or nutritional supplementation on body composition, blood components, and physical function in community-dwelling elderly Japanese women with sarcopenic obesity. DESIGN: Randomized controlled trial. SETTING: Urban community in Tokyo, Japan. PARTICIPANTS: Among 1213 community-dwelling elderly women over 70 years of age, 307 were defined with sarcopenic obesity, and 139 women participated in the study...
August 17, 2016: Journal of the American Medical Directors Association
Etienne Joosten, Elke Detroyer, Koen Milisen
BACKGROUND: Anaemia is a common problem in hospitalized older patients and is recognized as a risk factor for a significant number of adverse outcomes. Data of the effect of anaemia on functional status during hospitalization and mortality after discharge are limited. Aim of the study is to examine whether there is an association between anaemia, hand grip strength, gait speed and basic activities of daily living (ADL) during hospitalization and mortality 1 year after discharge in geriatric patients...
2016: BMC Geriatrics
Erika Zemková, Oľga Kyselovičová, Michal Jeleň, Zuzana Kováčiková, Gábor Ollé, Gabriela Štefániková, Tomáš Vilman, Miroslav Baláž, Timea Kurdiová, Jozef Ukropec, Barbara Ukropcová
This study evaluates the effect of 3 months resistance and aerobic training on muscle strength and power in 17 male overweight and obese men. Subjects underwent either a resistance or aerobic training for a period of 3 months (three sessions per week). Peak isometric force, rate of force development, peak power and height of countermovement and squat jumps, reactive strength index, and mean power in the concentric phase of bench presses were all assessed prior to and after completing the training program. Results identified a significant increase of mean power during both countermovement bench presses at 30 kg (18...
August 15, 2016: American Journal of Men's Health
Melissa Mulraney, Nardia Zendarski, Fiona Mensah, Harriet Hiscock, Emma Sciberras
OBJECTIVE: Irritable mood is common in children with attention-deficit/hyperactivity disorder. Research to date has primarily comprised cross-sectional studies; thus, little is known about the antecedents of irritability. Furthermore, existing cross-sectional studies generally focus on the association between irritability and comorbidities and do not examine broader aspects of functioning. Finally, previous research has neglected to include child-report of irritability. This study aimed to address these gaps using data from a longitudinal study of children with attention-deficit/hyperactivity disorder...
August 11, 2016: Australian and New Zealand Journal of Psychiatry
Isabel Castrejón, Theodore Pincus, Daniel Wendling, Maxime Dougados
OBJECTIVE: To evaluate the responsiveness of a simple routine assessment of patient index data (RAPID3)-like index that includes only 3 patient self-report measures (physical function, pain and patient global estimate) compared to that of traditional composite indices to assess change in patients with axial spondyloarthritis (Ax-SpA). METHODS: Devenir des Spondylarthropathies Indifférenciées Récentes (DESIR) is a prospective cohort of patients with inflammatory back pain suggestive of Ax-SpA...
2016: RMD Open
Lara Grobler, Suzanne Ferreira, Benedicte Vanwanseele, Elmarie E Terblanche
BACKGROUND: The need for information regarding running-specific prosthetic properties has previously been voiced. Such information is necessary to assist in athletes' prostheses selection. OBJECTIVES: This study aimed to describe the characteristics of two commercially available running-specific prostheses. STUDY DESIGN: The running-specific prostheses were tested (in an experimental setup) without the external interference of athlete performance variations...
August 1, 2016: Prosthetics and Orthotics International
Dello Iacono Antonio, Domenico Martone, Mirjana Milic, Padulo Johnny
This study aimed to assess the chronic effects of vertical and horizontal drop-jump-based protocols on neuromuscular explosive abilities such as jumping, sprinting, and change of direction (COD). Eighteen elite male handball players (age 23.4 ± 4.6 years; height 192.5 ± 3.7 cm; weight 87.8 ± 7.4 kg) were assigned to either vertical drop jump (VDJ) or horizontal drop jump (HDJ) group training twice a week for 10 weeks. Participants performed 5-8 sets × 6-10 repetitions of vertical-alternate (VDJ) or horizontal-alternate (HDJ) one-leg drop-jumps, landing from the top of a platform 25 cm in height...
July 7, 2016: Journal of Strength and Conditioning Research
Chuanming Li, Xin Wei, Qinghua Zou, Yi Zhang, Xuntao Yin, Jun Zhao, Jian Wang
Neurological impairment plays an important role in the development of Ankylosing spondylitis (AS). Early diagnosis and detection of it may stop the progress of neurological complications and improve the quality of patients' lives greatly. Somatosensory evoked potential (SSEP) and magnetic motor evoked potentials (MEP) have been proved useful to detect neurological impairments of AS. This study aimed to investigate the cerebral function deficits of AS using functional MRI technology. Twenty seven patients with AS and 28 control subjects were included in this study...
July 9, 2016: Brain Imaging and Behavior
John M Radnor, Rhodri S Lloyd, Jon L Oliver
The aim of this study was to examine individual responses to different forms of resistance training on measures of jumping and sprinting performance in school-aged boys. Eighty boys were categorized into two maturity groups (pre- or post-PHV) and randomly assigned to a plyometric training, resistance training, combined training, or control group. Intervention groups participated in training twice weekly for six weeks, with measures of acceleration, maximal running velocity, squat jump height and reactive strength index collected pre and post intervention...
June 29, 2016: Journal of Strength and Conditioning Research
Damien J Byrne, Declan T Browne, Paul J Byrne, Noel Richardson
The purpose of this study was to investigate the inter-day reliability of the reactive strength index (RSI) and optimal drop height (ODH) identification from multiple drop heights. Nineteen male trained hurling players (23.1±2.9 years, 83.1±15.5kg, and 182.5±54.89cm) completed 2 maximal depth jumps from 4 incremental drop heights (30, 40, 50, 60cm), over two separate testing sessions 48 hours apart. The RSI and ODH were analysed for reliability using intraclass correlation coefficient (ICC) and coefficient of variation (CV)...
June 28, 2016: Journal of Strength and Conditioning Research
Valerie Carson, Mark S Tremblay, Jean-Philippe Chaput, Sebastien F M Chastin
The purpose of this study was to examine the relationships between movement behaviours (sleep duration, sedentary time, physical activity) and health indicators in a representative sample of children and youth using compositional analyses. Cross-sectional findings are based on 4169 children and youth (aged 6-17 years) from cycles 1 to 3 of the Canadian Health Measures Survey. Sedentary time (SB), light-intensity physical activity (LPA), and moderate- to vigorous-intensity physical activity (MVPA) were accelerometer-derived...
June 2016: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
An-Chun Hwang, Yu-Rui Zhan, Wei-Ju Lee, Li-Ning Peng, Liang-Yu Chen, Ming-Hsien Lin, Li-Kuo Liu, Liang-Kung Chen
The objective of this study is to explore the impact of aging and daily physical activities (PA) on muscle mass and muscle strength among community-dwelling people in Taiwan.The design is a cross-sectional study. Setting is a population-based community study.One thousand eight hundred thirty-nine community-dwelling people aged 50 years and older in Taiwan participated in the study.Measurements include demographic characteristics, Charlson Comorbidity Index (CCI) for multimorbidity, mini-nutritional assessment (MNA) for nutritional evaluation, functional autonomy measurement system (SMAF) for functional capacity, Chinese version mini mental state examination (MMSE), 5-item Taiwan Geriatric Depression Scale (TGDS-5), Chinese version of International Physical Activity Questionnaire (IPAQ), height-adjusted skeletal muscle index (SMI) by dual-energy X-ray absorptiometry, handgrip strength, timed 6-m walking test for usual gait speed...
May 2016: Medicine (Baltimore)
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