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https://www.readbyqxmd.com/read/28642437/human-in-the-loop-optimization-of-exoskeleton-assistance-during-walking
#1
Juanjuan Zhang, Pieter Fiers, Kirby A Witte, Rachel W Jackson, Katherine L Poggensee, Christopher G Atkeson, Steven H Collins
Exoskeletons and active prostheses promise to enhance human mobility, but few have succeeded. Optimizing device characteristics on the basis of measured human performance could lead to improved designs. We have developed a method for identifying the exoskeleton assistance that minimizes human energy cost during walking. Optimized torque patterns from an exoskeleton worn on one ankle reduced metabolic energy consumption by 24.2 ± 7.4% compared to no torque. The approach was effective with exoskeletons worn on one or both ankles, during a variety of walking conditions, during running, and when optimizing muscle activity...
June 23, 2017: Science
https://www.readbyqxmd.com/read/28633035/economy-and-endurance-in-human-evolution
#2
REVIEW
Herman Pontzer
The evolutionary pressures shaping humans' unique bipedal locomotion have been a focus of research since Darwin, but the origins of humans' economical walking gait and endurance running capabilities remain unclear. Here, I review the anatomical and physiological determinants of locomotor economy (e.g., limb length and posture) and endurance (e.g., muscle volume and fiber type) and investigate their development in the hominin fossil record. The earliest hominins were bipedal but retained ape-like features in the hind limb that would have limited their walking economy compared to living humans...
June 19, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28613067/the-american-health-care-act-economic-and-employment-consequences-for-states
#3
Leighton Ku, Erika Steinmetz, Erin Brantley, Nikhil Holla, Brian K Bruen
ISSUE: The American Health Care Act (AHCA), passed by the U.S. House of Representatives, would repeal and replace the Affordable Care Act. The Congressional Budget Office indicates that the AHCA could increase the number of uninsured by 23 million by 2026. GOAL: To determine the consequences of the AHCA on employment and economic activity in every state. METHODS: We compute changes in federal spending and revenue from 2018 to 2026 for each state and use the PI+ model to project the effects on states’ employment and economies...
June 2017: Issue Brief of the Commonwealth Fund
https://www.readbyqxmd.com/read/28593509/health-expenditure-and-economic-growth-a-review-of-the-literature-and-an-analysis-between-the-economic-community-for-central-african-states-cemac-and-selected-african-countries
#4
Serge Mandiefe Piabuo, Julius Chupezi Tieguhong
African leaders accepted in the year 2001 through the Abuja Declaration to allocate 15% of their government expenditure on health but by 2013 only five (5) African countries achieved this target. In this paper, a comparative analysis on the impact of health expenditure between countries in the CEMAC sub-region and five other African countries that achieved the Abuja declaration is provided. Data for this study was extracted from the World Development Indicators (2016) database, panel ordinary least square (OLS), fully modified ordinary least square (FMOLS) and dynamic ordinary least square (DOLS) were used as econometric technic of analysis...
December 2017: Health Economics Review
https://www.readbyqxmd.com/read/28556613/scale-up-scale-down-of-microbial-bioprocesses-a-modern-light-on-an-old-issue
#5
Frank Delvigne, Henk Noorman
The bio-economy is in transit from innovation to commercialization. The bioprocess industry is expected to increasingly deliver bio-products to the market, in large amounts, at high quality and at competitive cost levels. This requires flawless start-up of new large-scale bioprocesses and continuous improvement of running processes. Fermentation scale-up and operation can benefit from recent advances in three areas: 1. computation-driven design of scale-down simulators, 2. omics-driven metabolic engineering and 3...
July 2017: Microbial Biotechnology
https://www.readbyqxmd.com/read/28544858/effects-of-resistance-training-on-performance-in-previously-trained-endurance-runners-a-systematic-review
#6
Manuel Alcaraz-Ibañez, Manuel Rodríguez-Pérez
The aim of this work was to identify, synthesize and evaluate the results of randomized controlled trials examining the effects of resistance training on performance indicators in previously trained endurance runners. A database search was carried out in PubMed, Science Direct, OvidSPMedLine, Wiley, Web of Science, ProQuest and Google Scholar. In accordance with the PRISMA checklist, 18 published articles dated prior to May 2016 involving 321 endurance runners were reviewed using the PEDro scale. Resistance training led to general improvements in muscular strength, running economy, muscle power factors, and direct performance in distances between 1,500 and 10,000 m...
May 25, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28543734/the-effect-of-repeated-periods-of-speed-endurance-training-on-performance-running-economy-and-muscle-adaptations-113-120-characters
#7
Casper Skovgaard, Nicki Winfield Almquist, Jens Bangsbo
The effect of repeated intense training interventions was investigated in eight trained male runners (maximum oxygen uptake (VO2 -max): 59.3±3.2 ml·kg(-1) ·min(-1) , mean±SD) who performed ten speed endurance training (SET; repeated 30-s 'all-out' bouts) and ten aerobic moderate-intensity training sessions during two 40-day periods (P1 and P2) separated by ~80 days of habitual training. Before and after both P1 and P2, subjects completed an incremental test to exhaustion to determine VO2 -max and a repeated running test at 90% vVO2 -max to exhaustion (RRT) to determine short-term endurance capacity...
May 19, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28530461/increase-in-leg-stiffness-reduces-joint-work-during-backpack-carriage-running-at-slow-velocities
#8
Bernard Liew, Kevin Netto, Susan Morris
Optimal tuning of leg stiffness has been associated with better running economy. Running with load is energetically expensive, which could have a significant impact on athletic performance where backpack carriage is involved. The purpose of this study was to investigate the impact of load magnitude and velocity on leg stiffness. We also explored the relationship between leg stiffness and running joint work. Thirty-one healthy participants ran overground at three velocities (3.0, 4.0, 5.0 m.s(-1)), whilst carrying three load magnitude (0%, 10%, 20% weight)...
May 22, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28515840/self-optimization-of-stride-length-among-experienced-and-inexperienced-runners
#9
Iain Hunter, Kelly Lee, Jared Ward, James Tracy
Experienced runners appear to naturally select a stride length which is optimal for minimizing oxygen uptake. However, whether this ability is naturally built into the human body or whether it is learned through experience has not been previously tested. This study investigated whether inexperienced runners are as capable as experienced runners of self-optimizing stride length to minimize oxygen uptake. Thirty-three subjects (nineteen experienced and fourteen inexperienced) ran for twenty-minutes while preferred and economical stride lengths were measured...
2017: International Journal of Exercise Science
https://www.readbyqxmd.com/read/28503379/a-public-dataset-of-running-biomechanics-and-the-effects-of-running-speed-on-lower-extremity-kinematics-and-kinetics
#10
Reginaldo K Fukuchi, Claudiane A Fukuchi, Marcos Duarte
BACKGROUND: The goals of this study were (1) to present the set of data evaluating running biomechanics (kinematics and kinetics), including data on running habits, demographics, and levels of muscle strength and flexibility made available at Figshare (DOI: 10.6084/m9.figshare.4543435); and (2) to examine the effect of running speed on selected gait-biomechanics variables related to both running injuries and running economy. METHODS: The lower-extremity kinematics and kinetics data of 28 regular runners were collected using a three-dimensional (3D) motion-capture system and an instrumented treadmill while the subjects ran at 2...
2017: PeerJ
https://www.readbyqxmd.com/read/28498143/the-crucible-simulation-behavioral-simulation-improves-clinical-leadership-skills-and-understanding-of-complex-health-policy-change
#11
Daniel Cohen, Ivo Vlaev, Laurie McMahon, Sarah Harvey, Andy Mitchell, Leah Borovoi, Ara Darzi
BACKGROUND: The Health and Social Care Act 2012 represents the most complex National Health Service reforms in history. High-quality clinical leadership is important for successful implementation of health service reform. However, little is known about the effectiveness of current leadership training. PURPOSE: This study describes the use of a behavioral simulation to improve the knowledge and leadership of a cohort of medical doctors expected to take leadership roles in the National Health Service...
May 11, 2017: Health Care Management Review
https://www.readbyqxmd.com/read/28483557/six-week-transition-to-minimalist-shoes-improves-running-economy-and-time-trial-performance
#12
Joel T Fuller, Dominic Thewlis, Margarita D Tsiros, Nicholas A T Brown, Jonathan D Buckley
OBJECTIVES: This study investigated if gradually introducing runners to minimalist shoes during training improved running economy and time-trial performance compared to training in conventional shoes. Changes in stride rate, stride length, footfall pattern and ankle plantar-flexor strength were also investigated. DESIGN: Randomised parallel intervention trial. METHODS: 61 trained runners gradually increased the amount of running performed in either minimalist (n=31) or conventional (n=30) shoes during a six-week standardised training program...
April 21, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28469761/lower-leg-length-is-associated-with-running-economy-in-high-level-caucasian-distance-runners
#13
Rauno Laumets, Karel Viigipuu, Kerli Mooses, Jarek Mäestu, Priit Purge, Ando Pehme, Priit Kaasik, Martin Mooses
The aim of the present study was to investigate lower limb anthropometric and composition variables related to running economy (RE) and running performance in a homogeneous group of high level European distance runners. RE at the speeds of 14, 16 and 18 km·h(-1) (189 ± 12; 188 ± 11; 187 ± 11 O2 ml·kg(-1)·km(-1)) and maximal oxygen uptake (VO2max) (67.3 ± 2.9 ml·kg(-1)·min(-1)) of 13 high level distance runners were determined on a motorised treadmill. Anthropometric variables and body composition were measured...
February 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28468871/a-disparity-between-locomotor-economy-and-territory-holding-ability-in-male-house-mice
#14
Jeremy S Morris, James S Ruff, Wayne K Potts, David R Carrier
Both economical locomotion and physical fighting are important performance traits to many species because of their direct influence on components of Darwinian fitness. Locomotion represents a substantial portion of the total daily energy budget of many animals. Fighting performance often determines individual reproductive fitness through the means of resource control, social dominance, and access to mates. However, phenotypic traits that improve either locomotor economy or fighting ability may diminish performance in the other...
May 3, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28462571/effects-of-minimal-dose-of-strength-training-on-running-performance-in-female-recreational-runners
#15
Michal Štohanzl, Jiri Baláš, Nick Draper
BACKGROUND: The purpose of this study was to analyse the extent to which minimal dose strength training would elicit improvements in running performance for female recreational runners. METHODS: Forty-one female recreational runners were randomly assigned to one of three groups (endurance running [E] n=14; combined endurance running and strength training program once [ES30] n=14 and twice a week [ES60] n=13, respectively). During the 10-week training program, the E group completed 3 hours of continuous endurance running per week; ES30 completed 2 ½ hours of continuous endurance running and 1 x 30 min of strength training per week, while ES60 group completed 2 hours of continuous endurance running and 2x30 min of strength training per week...
April 28, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28459289/is-there-an-optimum-speed-for-economical-running
#16
Matthew I Black, Joseph C Handsaker, Sam J Allen, Stephanie E Forrester, Jonathan P Folland
The influence of running speed and sex on running economy is unclear and may have been confounded by measurements of oxygen cost that do not account for known differences in substrate metabolism, across a limited range of speeds, and differences in performance standard. Therefore, this study assessed the energy cost of running over a wide-range of speeds in high-level and recreational runners to investigate the effect of speed (considered in absolute and relative terms) and sex (males vs. females of equivalent performance standard) on running economy...
May 1, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28391458/the-significance-of-renewable-energy-use-for-economic-output-and-environmental-protection-evidence-from-the-next-11-developing-economies
#17
Sudharshan Reddy Paramati, Avik Sinha, Eyup Dogan
Increasing economic activities in developing economies raise demand for energy mainly sourced from conventional sources. The consumption of more conventional energy will have a significant negative impact on the environment. Therefore, attention of policy makers has recently shifted towards the promotion of renewable energy generation and uses across economic activities to ensure low carbon economy. Given the recent scenario, in this paper, we aim to examine the role of renewable energy consumption on the economic output and CO2 emissions of the next fastest developing economies of the world...
May 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28338382/does-foot-anthropometry-predict-metabolic-cost-during-running
#18
Herman van Werkhoven, Stephen J Piazza
Several recent investigations have linked running economy to heel length, with shorter heels being associated with less metabolic energy consumption. It has been hypothesized that shorter heels require larger plantarflexor muscle forces, thus increasing tendon energy storage and reducing metabolic cost. The goal of this study was to investigate this possible mechanism for metabolic cost reduction. Fifteen male subjects ran at 16 km·h(-1) on a treadmill and subsequently on a force-plate instrumented runway...
March 24, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28290718/assessments-of-mechanical-stiffness-and-relationships-to-performance-determinants-in-middle-distance-runners
#19
Simon A Rogers, Chris S Whatman, Simon N Pearson, Andrew E Kilding
PURPOSE: This study aimed to examine relationships between methods of lower-limb stiffness and their associations with running economy (RE) and maximal velocity (vmax) in middle-distance (MD) runners. METHODS: Eleven highly-trained male MD runners performed a series of mechanical and physiological tests to determine maximal overground sprint speed, RE and V̇O2peak. Achilles tendon stiffness (kT) was estimated using ultrasonography during maximal isometric ankle plantarflexion...
March 14, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28263283/running-technique-is-an-important-component-of-running-economy-and-performance
#20
Jonathan P Folland, Sam J Allen, Matthew I Black, Joseph C Handsaker, Stephanie E Forrester
Despite an intuitive relationship between technique and both running economy (RE) and performance, and the diverse techniques used by runners to achieve forward locomotion, the objective importance of overall technique and the key components therein remain to be elucidated. PURPOSE: This study aimed to determine the relationship between individual and combined kinematic measures of technique with both RE and performance. METHODS: Ninety-seven endurance runners (47 females) of diverse competitive standards performed a discontinuous protocol of incremental treadmill running (4-min stages, 1-km·h increments)...
July 2017: Medicine and Science in Sports and Exercise
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