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Energy cost of running

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https://www.readbyqxmd.com/read/28331551/environmental-costs-and-benefits-of-growing-miscanthus-for-bioenergy-in-the-uk
#1
REVIEW
Jon P McCalmont, Astley Hastings, Niall P McNamara, Goetz M Richter, Paul Robson, Iain S Donnison, John Clifton-Brown
Planting the perennial biomass crop Miscanthus in the UK could offset 2-13 Mt oil eq. yr(-1), contributing up to 10% of current energy use. Policymakers need assurance that upscaling Miscanthus production can be performed sustainably without negatively impacting essential food production or the wider environment. This study reviews a large body of Miscanthus relevant literature into concise summary statements. Perennial Miscanthus has energy output/input ratios 10 times higher (47.3 ± 2.2) than annual crops used for energy (4...
March 2017: Global Change Biology. Bioenergy
https://www.readbyqxmd.com/read/28301525/muscle-activities-during-walking-and-running-at-energetically-optimal-transition-speed-under-normobaric-hypoxia-on-gradient-slopes
#2
Daijiro Abe, Yoshiyuki Fukuoka, Masahiro Horiuchi
Energy cost of transport per unit distance (CoT; J·kg-1·km-1) displays a U-shaped fashion in walking and a linear fashion in running as a function of gait speed (v; km·h-1). There exists an intersection between U-shaped and linear CoT-v relationships, being termed energetically optimal transition speed (EOTS; km·h-1). Combined effects of gradient and moderate normobaric hypoxia (15.0% O2) were investigated when walking and running at the EOTS in fifteen young males. The CoT values were determined at eight walking speeds (2...
2017: PloS One
https://www.readbyqxmd.com/read/28289370/energetic-constraints-produce-self-sustained-oscillatory-dynamics-in-neuronal-networks
#3
Javier Burroni, P Taylor, Cassian Corey, Tengiz Vachnadze, Hava T Siegelmann
Overview: We model energy constraints in a network of spiking neurons, while exploring general questions of resource limitation on network function abstractly. Background: Metabolic states like dietary ketosis or hypoglycemia have a large impact on brain function and disease outcomes. Glia provide metabolic support for neurons, among other functions. Yet, in computational models of glia-neuron cooperation, there have been no previous attempts to explore the effects of direct realistic energy costs on network activity in spiking neurons...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28274276/treatment-with-l-citrulline-in-patients-with-post-polio-syndrome-study-protocol-for-a-single-center-randomised-placebo-controlled-double-blind-trial
#4
Simone Schmidt, Vanya Gocheva, Thomas Zumbrunn, Daniela Rubino-Nacht, Ulrike Bonati, Dirk Fischer, Patricia Hafner
BACKGROUND: Post-polio syndrome (PPS) is a condition that affects polio survivors years after recovery from an initial acute infection by the Poliomyelitis virus. Most often, patients who suffered from polio start to experience gradual new weakening in muscles, a gradual decrease in the size of muscles (muscle atrophy) and fatigue years after the acute illness. L-citrulline is known to change muscular metabolism synthesis by raising nitric oxide (NO) levels and increasing protein synthesis...
March 9, 2017: Trials
https://www.readbyqxmd.com/read/28263283/running-technique-is-an-important-component-of-running-economy-and-performance
#5
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 employed by runners to achieve forward locomotion, the objective importance of overall technique and the key components therein remain to be elucidated. PURPOSE: To determine the relationship between individual and combined kinematic measures of technique with both RE and performance. METHODS: Ninety-seven endurance runners (47 female) of diverse competitive standards performed a discontinuous protocol of incremental treadmill running (4 min stages, 1 km...
March 3, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28242427/purification-and-characterization-of-a-collagenase-from-penicillium-sp-ucp-1286-by-polyethylene-glycol-phosphate-aqueous-two-phase-system
#6
Maria Carolina de Albuquerque Wanderley, José Manoel Wanderley Duarte Neto, Wendell Wagner Campos Albuquerque, Daniela de Araújo Viana Marques, Carolina de Albuquerque Lima, Sara Isabel da Cruz Silvério, José Luiz de Lima Filho, José António Couto Teixeira, Ana Lúcia Figueiredo Porto
Collagenases are proteolytic enzymes capable of degrading both native and denatured collagen, reported to be applied in industrial, medical and biotechnological sectors. Liquid-liquid extraction using aqueous two-phase system (ATPS) is one of the most promising bioseparation techniques, which can substitute difficult solid-liquid separation processes, offering many advantages over conventional methods including low-processing time, low-cost material and low-energy consumption. The collagenase produced by Penicillium sp...
February 24, 2017: Protein Expression and Purification
https://www.readbyqxmd.com/read/28215797/in-situ-evaluation-of-water-and-energy-consumptions-at-the-end-use-level-the-influence-of-flow-reducers-and-temperature-in-baths
#7
C Matos, A Briga-Sá, I Bentes, D Faria, S Pereira
Nowadays, water and energy consumption is intensifying every year in most of the countries. This perpetual increase will not be supportable in the long run, making urgently to manage these resources on a sustainable way. Domestic consumptions of water and electric energy usually are related and it's important to study that relation, identifying opportunities for use efficient improvement. In fact, without an understanding of water-energy relations, there are water efficiency measures that may lead to unintentional costs in the energy efficiency field...
May 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28195301/people-choose-to-run-at-their-optimal-speed
#8
Joseph K Rathkey, Cara M Wall-Scheffler
OBJECTIVES: The purpose of this article is to test whether people choose to behave in a manner that reduces the amount of energy they use to travel a given distance. While this has been shown consistently for walking, it has never been tested with human running. MATERIALS AND METHODS: We collected energetic data and lower limb anthropometrics on nine men running at six different running speeds. We collected on all six speeds on 3 different days and took the average of the energetic values for each speed...
February 14, 2017: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/28066524/bioenergetic-differences-during-walking-and-running-in-transfemoral-amputee-runners-using-articulating-and-non-articulating-knee-prostheses
#9
M Jason Highsmith, Jason T Kahle, Rebecca M Miro, Larry J Mengelkoch
Transfemoral amputation (TFA) patients require considerably more energy to walk and run than non-amputees. The purpose of this study was to examine potential bioenergetic differences (oxygen uptake (VO2), heart rate (HR), and ratings of perceived exertion (RPE)) for TFA patients utilizing a conventional running prosthesis with an articulating knee mechanism versus a running prosthesis with a non-articulating knee joint. Four trained TFA runners (n = 4) were accommodated to and tested with both conditions. VO2 and HR were significantly lower (p ≤ 0...
September 2016: Technology and Innovation
https://www.readbyqxmd.com/read/28018651/stability-in-skipping-gaits
#10
Emanuel Andrada, Roy Müller, Reinhard Blickhan
As an alternative to walking and running, humans are able to skip. However, adult humans avoid it. This fact seems to be related to the higher energetic costs associated with skipping. Still, children, some birds, lemurs and lizards use skipping gaits during daily locomotion. We combined experimental data on humans with numerical simulations to test whether stability and robustness motivate this choice. Parameters for modelling were obtained from 10 male subjects. They locomoted using unilateral skipping along a 12 m runway...
November 2016: Royal Society Open Science
https://www.readbyqxmd.com/read/28012036/no-influence-of-ischemic-preconditioning-on-running-economy
#11
Gungeet Kaur, Megan Binger, Claire Evans, Tiffany Trachte, Gary P Van Guilder
PURPOSE: Many of the potential performance-enhancing properties of ischemic preconditioning suggest that the oxygen cost for a given endurance exercise workload will be reduced, thereby improving the economy of locomotion. The aim of this study was to identify whether ischemic preconditioning improves exercise economy in recreational runners. METHODS: A randomized sham-controlled crossover study was employed in which 18 adults (age 27 ± 7 years; BMI 24.6 ± 3 kg/m(2)) completed two, incremental submaximal (65-85% VO2max) treadmill running protocols (3 × 5 min stages from 7...
December 23, 2016: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/27943326/technologies-for-prolonging-cardiac-implantable-electronic-device-longevity
#12
REVIEW
Ernest W Lau
Prolonged longevity of cardiac implantable electronic devices (CIEDs) is needed not only as a passive response to match the prolonging life expectancy of patient recipients, but will also actively prolong their life expectancy by avoiding/deferring the risks (and costs) associated with device replacement. CIEDs are still exclusively powered by nonrechargeable primary batteries, and energy exhaustion is the dominant and an inevitable cause of device replacement. The longevity of a CIED is thus determined by the attrition rate of its finite energy reserve...
January 2017: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/27922209/unconventional-pretreatment-of-lignocellulose-with-low-temperature-plasma
#13
REVIEW
Jens Vanneste, Thijs Ennaert, Annick Vanhulsel, Bert Sels
Lignocellulose represents a potential supply of sustainable feedstock for the production of biofuels and chemicals. There is, however, an important cost and efficiency challenge associated with the conversion of such lignocellulosics. Because its structure is complex and not prone to undergo chemical reactions very easily, chemical and mechanical pretreatments are usually necessary to be able to refine them into the compositional building blocks (carbohydrates and lignin) from which value-added platform molecules, such as glucose, ethylene glycol, 5-hydroxymethylfurfural, and levulinic acid, and biofuels, such as bioderived naphtha, kerosene, and diesel fractions, will be produced...
December 6, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27903628/the-role-of-plantigrady-and-heel-strike-in-the-mechanics-and-energetics-of-human-walking-with-implications-for-the-evolution-of-the-human-foot
#14
James T Webber, David A Raichlen
Human bipedal locomotion is characterized by a habitual heel-strike (HS) plantigrade gait, yet the significance of walking foot-posture is not well understood. To date, researchers have not fully investigated the costs of non-heel-strike (NHS) walking. Therefore, we examined walking speed, walk-to-run transition speed, estimated locomotor costs (lower limb muscle volume activated during walking), impact transient (rapid increase in ground force at touchdown) and effective limb length (ELL) in subjects (n=14) who walked at self-selected speeds using HS and NHS gaits...
December 1, 2016: Journal of Experimental Biology
https://www.readbyqxmd.com/read/27885098/energy-costs-and-performance-of-transfemoral-amputees-and-non-amputees-during-walking-and-running-a-pilot-study
#15
Larry J Mengelkoch, Jason T Kahle, M Jason Highsmith
BACKGROUND: Limited information is available concerning the effects of prosthetic foot components on energy costs and ambulatory performance for transfemoral amputees. OBJECTIVES: Compare energy costs (VO2; gait economy) and ambulatory performance (self-selected walking speeds, self-selected running speeds, peak running speeds) differences during walking and running for transfemoral amputees and matched, non-amputee runners. STUDY DESIGN: Repeated measures...
November 24, 2016: Prosthetics and Orthotics International
https://www.readbyqxmd.com/read/27877137/an-extreme-mountain-ultra-marathon-decreases-the-cost-of-uphill-walking-and-running
#16
Gianluca Vernillo, Aldo Savoldelli, Spyros Skafidas, Andrea Zignoli, Antonio La Torre, Barbara Pellegrini, Guido Giardini, Pietro Trabucchi, Grégoire P Millet, Federico Schena
Purpose: To examine the effects of the world's most challenging mountain ultramarathon (MUM, 330 km, cumulative elevation gain of +24,000 m) on the energy cost and kinematics of different uphill gaits. Methods: Before (PRE) and immediately after (POST) the competition, 19 male athletes performed three submaximal 5-min treadmill exercise trials in a randomized order: walking at 5 km·h(-1), +20%; running at 6 km·h(-1), +15%; and running at 8 km·h(-1), +10%. During the three trials, energy cost was assessed using an indirect calorimetry system and spatiotemporal gait parameters were acquired with a floor-level high-density photoelectric cells system...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27875261/the-apparently-contradictory-energetics-of-hopping-and-running-the-counter-intuitive-effect-of-constraints-resolves-the-paradox
#17
Anne K Gutmann, John E A Bertram
Metabolic rate appears to increase with the rate of force application for running. Leg function during ground contact is similar in hopping and running, so one might expect that this relationship would hold for hopping as well. Surprisingly, metabolic rate appeared to decrease with increasing force rate for hopping. However, this paradox is the result of comparing different cross-sections of the metabolic cost landscapes for hopping and running. The apparent relationship between metabolic rate and force rate observed in treadmill running is likely not a fundamental characteristic of muscle physiology, but a result of runners responding to speed constraints, i...
January 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/27860362/safe-and-ecological-refluxing-with-a-closed-loop-air-cooling-system
#18
Stefan Böhmdorfer, Gottfried Eilenberger, Thomas Zweckmair, Ivan Sumerskii, Antje Potthast, Thomas Rosenau
Off-the-shelf computer cooling hardware was used to construct a closed-loop air cooling system (CLACS) that is distinguished by scalability, low energy, and no tap water consumption. Constructed to be generally used with laboratory condensers, the system was tested with several common low and high boiling solvents and showed a condensation performance equivalent to conventional tap water cooling. Reaction yields were therefore unaffected. Also, long-lasting Soxhlet extractions showed no performance loss relative to conventional cooling...
November 8, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27802142/a-different-angle-comparative-analyses-of-whole-animal-transport-costs-when-running-uphill
#19
Lewis G Halsey, Craig R White
Comparative work on the cost of terrestrial locomotion in animals has focused on the underpinning physiology and biomechanics. Often, much of an animal's energy budget is spent on moving around; thus, there is also value in interpreting such data from an ecological perspective. When animals move through their environment, they encounter topographical variation, and this is a key factor that can dramatically affect their energy expenditure. We collated published data on the costs for birds and mammals to locomote terrestrially on inclines, and investigated the scaling relationships using a phylogenetically informed approach...
January 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/27782608/a-compact-low-cost-marx-bank-for-generating-capillary-discharge-plasmas
#20
A E Dyson, C Thornton, S M Hooker
We describe in detail a low power Compact Marx Bank (CMB) circuit that can provide 20 kV, 500 A pulses of approximately 100-200 ns duration. One application is the generation of capillary discharge plasmas of density ≈10(18) cm(-3) used in laser plasma accelerators. The CMB is triggered with a high speed solid state switch and gives a high voltage output pulse with a ns scale rise time into a 50 Ω load (coaxial cable) with <4 ns voltage jitter. Its small size (10 cm  ×  25 cm  ×  5 cm) means that it can be placed right next to the capillary discharge in the target chamber to avoid the need to impedance match...
September 2016: Review of Scientific Instruments
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