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Critical velocity exercise

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https://www.readbyqxmd.com/read/28596738/intensity-and-duration-based-options-to-regulate-endurance-training
#1
Peter Hofmann, Gerhard Tschakert
The regulation of endurance training is usually based on the prescription of exercise intensity. Exercise duration, another important variable of training load, is rarely prescribed by individual measures and mostly set from experience. As the specific exercise duration for any intensity plays a substantial role regarding the different kind of cellular stressors, degree, and kind of fatigue as well as training effects, concepts integrating the prescription of both intensity and duration within one model are needed...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28542091/normative-data-for-critical-speed-and-d-for-high-level-male-rugby-players
#2
Mark Kramer, Ida E Clark, Nick Jamnick, Cody Strom, Robert W Pettitt
The critical speed (CS) concept helps characterize the aerobic and anaerobic fitness of an athlete. Rugby players should hypothetically have modest CS values but extremely high curvature constant (D') values, yet, normative data are currently unavailable. To develop normative data of CS and D' for high-level male rugby players, a total of 30 male rugby players, were recruited from the Eastern Cape of South Africa. All subjects performed the running 3-min all-out exercise test (3 MT) using global positioning system (GPS) technology to determine CS and D'...
March 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28474195/effects-of-temperature-and-fatigue-on-the-metabolism-and-swimming-capacity-of-juvenile-chinese-sturgeon-acipenser-sinensis
#3
Xi Yuan, Yi-Hong Zhou, Ying-Ping Huang, Wen-Tao Guo, David Johnson, Qing Jiang, Jin-Jie Jing, Zhi-Ying Tu
Chinese sturgeon (Acipenser sinensis) is a critically endangered species. A flume-type respirometer, with video, was used to conduct two consecutive stepped velocity tests at 10, 15, 20, and 25 °C. Extent of recovery was measured after the 60-min recovery period between trials, and the recovery ratio for critical swimming speed (U crit) averaged 91.88% across temperatures. Temperature (T) effects were determined by comparing U crit, oxygen consumption rate (MO 2), and tail beat frequency (TBF) for each temperature...
May 4, 2017: Fish Physiology and Biochemistry
https://www.readbyqxmd.com/read/28445078/effects-of-high-intensity-interval-training-on-canoeing-performance
#4
Ming-Ta Yang, Mien-Mien Lee, Shu-Ching Hsu, Kuei-Hui Chan
The purpose of this study was to compare the effects of high-intensity interval training (HIIT) and moderate-intensity continuous training (MICT) utilizing a canoeing ergometer on endurance determinants, as well as aerobic and anaerobic performances among flat-water canoeists. Fourteen well-trained male flat-water canoeists were divided into an HIIT group or an MICT group. All subjects performed a continuous graded exercise test (GXT) and three fixed-distance (200, 500, and 1000 m) performance tests on a canoeing ergometer to determine canoeing economy, peak oxygen uptake (VO2peak), and power at VO2peak, and to calculate the critical velocity (CV) and anaerobic work capacity before and after the training programmes...
August 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28387692/the-role-of-sensory-augmentation-for-people-with-vestibular-deficits-real-time-balance-aid-and-or-rehabilitation-device
#5
K H Sienko, S L Whitney, W J Carender, C Wall
This narrative review highlights findings from the sensory augmentation field for people with vestibular deficits and addresses the outstanding questions that are critical to the translation of this technology into clinical and/or personal use. Prior research has demonstrated that the real-time use of visual, vibrotactile, auditory, and multimodal sensory augmentation technologies can improve balance during static and dynamic stance tasks within a laboratory setting. However, its application in improving gait requires additional investigation, as does its efficacy as a rehabilitation device for people with vestibular deficits...
2017: Journal of Vestibular Research: Equilibrium & Orientation
https://www.readbyqxmd.com/read/28057820/blood-flow-regulation-and-oxygen-uptake-during-high-intensity-forearm-exercise
#6
Stian Kwak Nyberg, Ole Kristian Berg, Jan Helgerud, Eivind Wang
The vascular strain is very high during heavy handgrip exercise, but the intensity and kinetics to reach peak blood flow, and peak oxygen uptake, are uncertain. We included 9 young (25±2yr) healthy males to evaluate blood flow and oxygen uptake responses during continuous dynamic handgrip exercise with increasing intensity. Blood flow was measured using Doppler-ultrasound and venous blood was drawn from a deep forearm vein to determine arteriovenous oxygen difference (a-vO2diff) during 6-minutes bouts of 60, 80 and 100% of maximal work rate (WRmax), respectively...
January 5, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28031762/effects-of-fatigue-on-throwing-performance-in-experienced-team-handball-players
#7
Alberto Nuño, Ignacio J Chirosa, Roland van den Tillaar, Rafael Guisado, Ignacio Martín, Isidoro Martinez, Luis J Chirosa
The purpose of this study was to investigate the effect of central and peripheral physiological fatigue on throwing accuracy and ball release velocity in team handball. Twenty male subjects (age 24.7 ± 3.9 yrs, body mass 88.5 ± 5.0 kg, body height 1.86 ± 0.05 m, training experience 12.7 ± 3.8 yrs) from one handball team participated in this study. The participants completed four sets of eight laps of a circuit that consisted of specific team handball drills/exercises, with decreasing recovery times between the laps in each set in order to induce physiological fatigue...
December 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/27922660/combined-vision-and-wearable-sensors-based-system-for-movement-analysis-in-rehabilitation
#8
Sofija Spasojević, Tihomir V Ilić, Slađan Milanović, Veljko Potkonjak, Aleksandar Rodić, José Santos-Victor
BACKGROUND: Traditional rehabilitation sessions are often a slow, tedious, disempowering and non-motivational process, supported by clinical assessment tools, i.e. evaluation scales that are prone to subjective rating and imprecise interpretation of patient's performance. Poor patient motivation and insufficient accuracy are thus critical factors that can be improved by new sensing / processing technologies. OBJECTIVES: We aim to develop a portable and affordable system, suitable for home rehabilitation, which combines vision-based and wearable sensors...
March 23, 2017: Methods of Information in Medicine
https://www.readbyqxmd.com/read/27890536/estimation-of-the-center-of-rotation-using-wearable-magneto-inertial-sensors
#9
M Crabolu, D Pani, L Raffo, A Cereatti
Determining the center of rotation (CoR) of joints is fundamental to the field of human movement analysis. CoR can be determined using a magneto-inertial measurement unit (MIMU) using a functional approach requiring a calibration exercise. We systematically investigated the influence of different experimental conditions that can affect precision and accuracy while estimating the CoR, such as (a) angular joint velocity, (b) distance between the MIMU and the CoR, (c) type of the joint motion implemented, (d) amplitude of the angular range of motion, (e) model of the MIMU used for data recording, (f) amplitude of additive noise on inertial signals, and (g) amplitude of the errors in the MIMU orientation...
December 8, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27638628/non-invasive-management-of-peripheral-arterial-disease
#10
K J Williams, A Babber, R Ravikumar, A H Davies
BACKGROUND: Peripheral arterial disease (PAD) is common and symptoms can be debilitating and lethal. Risk management, exercise, radiological and surgical intervention are all valuable therapies, but morbidity and mortality rates from this disease are increasing. Circulatory enhancement can be achieved using simple medical electronic devices, with claims of minimal adverse side effects. The evidence for these is variable, prompting a review of the available literature. METHODS: Embase and Medline were interrogated for full text articles in humans and written in English...
September 17, 2016: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/27550986/post-exercise-syncope-wingate-syncope-test-and-visual-cognitive-function
#11
Dylan C Sieck, Matthew R Ely, Steven A Romero, Meredith J Luttrell, Pedro M Abdala, John R Halliwill
Adequate cerebral perfusion is necessary to maintain consciousness in upright humans. Following maximal anaerobic exercise, cerebral perfusion can become compromised and result in syncope. It is unknown whether post-exercise reductions in cerebral perfusion can lead to visual-cognitive deficits prior to the onset of syncope, which would be of concern for emergency workers and warfighters, where critical decision making and intense physical activity are combined. Therefore, the purpose of this experiment was to determine if reductions in cerebral blood velocity, induced by maximal anaerobic exercise and head-up tilt, result in visual-cognitive deficits prior to the onset of syncope...
August 2016: Physiological Reports
https://www.readbyqxmd.com/read/27442329/modeling-of-running-performances-in-humans-comparison-of-power-laws-and-critical-speed
#12
Badrane Zinoubi, Henry Vandewalle, Tarak Driss
Zinoubi, B, Vandewalle, H, and Driss, T. Modeling of running performances in humans: comparison of power laws and critical speed. J Strength Cond Res 31(7): 1859-1867, 2017-The concepts of power law and critical speed (SCrit) have been applied to the analysis of individual running performances. We have analyzed the results of 2 exceptional runners (Nurmi and Gebrselassie) and 11 physical education students (PESs) who performed 3 exhausting running exercises. Power laws can accurately describe the relationships between exhaustion time (tlim) and distance (Dlim) or speed (S) (Equation is included in full-text article...
July 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27414074/light-load-maximal-lifting-velocity-full-squat-training-program-improves-important-physical-and-skill-characteristics-in-futsal-players
#13
Julio Torres-Torrelo, David Rodríguez-Rosell, Juan José González-Badillo
This study aimed to compare the effect of 6 weeks of resistance training or combined resistance training and change of direction exercises on physical performance and motor skills in futsal players. Thirty-four futsal players were divided into full squat group (SG, n = 12), combined full squat and change of direction exercises group (S+CDG, n = 12) and control group (CG, n = 10). The resistance training for SG consisted of full squat with low load (~45-58% 1RM) and low volume (4-6 repetitions), whereas the S+CDG performed the same resistance training program combined with loaded change of direction...
May 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/27320832/ballistic-strength-training-compared-with-usual-care-for-improving-mobility-following-traumatic-brain-injury-protocol-for-a-randomised-controlled-trial
#14
RANDOMIZED CONTROLLED TRIAL
Gavin Williams, Louise Ada, Leanne Hassett, Meg E Morris, Ross Clark, Adam L Bryant, John Olver
INTRODUCTION: Traumatic brain injury is the leading cause of disability in young adults aged 15 to 45 years. Mobility limitations are prevalent, and range in severity from interfering with basic day-to-day tasks to restricting participation in higher level social, leisure, employment and sporting activities. Despite the prevalence and severity of physical impairments, such as poor balance and spasticity, the main contributor to mobility limitations following traumatic brain injury is low muscle power generation...
July 2016: Journal of Physiotherapy
https://www.readbyqxmd.com/read/27259002/physical-therapy-interventions-for-gross-motor-skills-in-people-with-an-intellectual-disability-aged-6-years-and-over-a-systematic-review
#15
REVIEW
Judith Hocking, Julian McNeil, Jared Campbell
AIM: The systematic review was undertaken to investigate the effectiveness of physical therapy interventions for improving gross motor skills (GMSs) in people with an intellectual disability aged 6 years and older. There is a lack of physical therapy research for GMSs in this population, and no prior systematic review. People with an intellectual disability may require specific teaching approaches within therapy interventions to accommodate their cognitive and learning needs. People with an intellectual disability who suffer from GMS deficits can benefit from physical therapy to help improve their GMSs...
December 2016: International Journal of Evidence-based Healthcare
https://www.readbyqxmd.com/read/26849787/the-v-combining-dot-above-o2-kinetics-of-maximal-and-supramaximal-running-exercises-in-sprinters-and-middle-distance-runners
#16
COMPARATIVE STUDY
Paulo C do Nascimento Salvador, Juliano Dal Pupo, Ricardo D De Lucas, Rafael A de Aguiar, Francimara B Arins, Luiz G A Guglielmo
do Nascimento Salvador, PC, Dal Pupo, J, De Lucas, RD, de Aguiar, RA, Arins, FB, and Guglielmo, LGA. The V[Combining Dot Above]O2 kinetics of maximal and supramaximal running exercises in sprinters and middle-distance runners. J Strength Cond Res 30(10): 2857-2863, 2016-The aim of this study was to compare the V[Combining Dot Above]O2 kinetics parameters during maximal and supramaximal running exercises in sprinters (SPR) and middle-distance runners (MDR). Twelve SPR (age 20.6 ± 3.4 years; and body mass 74...
October 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/26733865/differential-effects-of-tango-versus-dance-for-pd-in-parkinson-disease
#17
Marie E McNeely, Marina M Mai, Ryan P Duncan, Gammon M Earhart
Over half of the general population does not achieve recommended daily levels of physical activity, and activity levels in people with Parkinson disease (PD) are lower than in healthy older adults. Dance can serve as an adjunct to traditional treatments to improve gait, balance, and quality of life in people with PD. This study directly compares a tango dance intervention and a dance intervention based on the Dance for PD model, which integrates multiple dance styles. Eleven people with PD participated in a community-based mixed styles dance intervention called Dance for Parkinson's (D4PD)...
2015: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/26603555/the-potential-impacts-of-migratory-difficulty-including-warmer-waters-and-altered-flow-conditions-on-the-reproductive-success-of-salmonid-fishes
#18
Miriam Fenkes, Holly A Shiels, John L Fitzpatrick, Robert L Nudds
Climate change and urbanisation of watercourses affect water temperatures and current flow velocities in river systems on a global scale. This represents a particularly critical issue for migratory fish species with complex life histories that use rivers to reproduce. Salmonids are migratory keystone species that provide substantial economical value to ecosystems and human societies. Consequently, a comprehensive understanding of the effects of environmental stressors on their reproductive success is critical in order to ensure their continued abundance during future climatic change...
March 2016: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/26592137/-float-first-and-kick-for-your-life-psychophysiological-basis-for-safety-behaviour-on-accidental-short-term-cold-water-immersion
#19
Martin J Barwood, Holly Burrows, Jess Cessford, Stuart Goodall
INTRODUCTION: Accidental cold-water immersion (CWI) evokes the life threatening cold shock response (CSR) which increases the risk of drowning. Consequently, the safety behaviour selected is critical in determining survival; the present advice is to 'float first' and remain stationary (i.e. rest). We examined whether leg only exercise (i.e., treading water; 'CWI-Kick') immediately on CWI could reduce the symptoms of the CSR, offset the reduction in cerebral blood flow that is known to occur and reduce the CSR's symptoms of breathlessness...
February 1, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/26589124/the-kenyan-runners
#20
REVIEW
H B Larsen, A W Sheel
Today the Kenyan dominance in middle- and long-distance running is so profound that it has no equivalence to any other sport in the world. Critical physiological factors for performance in running include maximal oxygen consumption (VO2max), fractional VO2max utilization and running economy (energetic cost of running). Kenyan and non-Kenyan elite runners seem to be able to reach very high, but similar maximal oxygen uptake levels just as there is some indication that untrained Kenyans and non-Kenyans have a similar VO2max...
December 2015: Scandinavian Journal of Medicine & Science in Sports
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