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https://www.readbyqxmd.com/read/28872389/training-related-changes-in-force-power-profiles-implications-for-the-skeleton-start
#1
Steffi L Colyer, Keith A Stokes, James L J Bilzon, Danny Holdcroft, Aki I T Salo
PURPOSE: Athletes' force-power characteristics influence sled velocity during the skeleton start, which is a crucial determinant of performance. This study characterised force-power profile changes across an 18-month period and investigated the associations between these changes and start performance. METHODS: Seven elite- and five talent-squad skeleton athletes' (representing 80% of registered athletes in the country) force-power profiles and dry-land push-track performances were assessed at multiple time-points over two 6-month training periods and one 5-month competition season...
September 5, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28716692/the-fatigue-of-a-full-body-resistance-exercise-session-in-trained-men
#2
Paul W M Marshall, Rebecca Cross, Michael Haynes
OBJECTIVES: We examined the fatigue and recovery for 48h following a full-body resistance exercise session in trained men. DESIGN: Experimental cross-sectional study. METHODS: Eight resistance trained men volunteered to participate (mean±SD; age 27.0±6.0 years, height 1.79±0.05m, weight 81.8±6.8kg, training experience 7.8±5.0 years). Fatigue and pain was measured before, after, 1h post, 24h and 48h post the full-body resistance exercise session, which was based on in-season models used in contact team sports (e...
July 4, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28682862/evidence-of-direct-cardiac-damage-following-high-intensity-exercise-in-chronic-energy-restriction-a-case-report-and-literature-review
#3
REVIEW
Marianne F Baird, Fergal Grace, Nicholas Sculthorpe, Scott M Graham, Audrey Fleming, Julien S Baker
RATIONALE: Following prolonged endurance events such as marathons, elevated levels of cardiospecific biomarkers are commonly reported. Although transiently raised levels are generally not considered to indicate clinical myocardial damage, comprehension of this phenomenon remains incomplete. The popularity of high-intensity interval training highlights a paucity of research measuring cardiac biomarker response to this type of exercise. This a posteriori case report discusses the elevation of cardiac troponins (cTn) associated with short interval, high-intensity exercise...
July 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28657791/selective-changes-on-the-mechanical-capacities-of-lower-body-muscles-after-a-cycle-ergometer-sprint-training-against-heavy-and-light-resistances
#4
Amador García-Ramos, Alejandro Torrejón, Alejandro Pérez-Castilla, Antonio J Morales-Artacho, Slobodan Jaric
PURPOSE: This study explored the feasibility of the linear force-velocity (F-V) modelling approach to detect selective changes of the F-V parameters (i.e., maximum force [F0], maximum velocity [V0], F-V slope [a], and maximum power [P0]) following a sprint training program. METHODS: Twenty-seven men were randomly assigned to a heavy load group (HLG), light load group (LLG), or control group (CG). The training sessions (6 weeks × 2 sessions per week) comprised performing eight maximal effort sprints against either heavy (HLG) or light (LLG) resistances in the leg cycle ergometer exercise...
June 28, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28474865/implication-of-dynamic-balance-in-change-of-direction-performance-in-young-elite-soccer-players-is-angle-dependent
#5
Mehdi Rouissi, Monoem Haddad, Nicola L Bragazzi, Adam L Owen, Wassim Moalla, Moktar Chtara, Karim Chamari
BACKGROUND: Team sports require rapid whole body change of direction (COD) in order to regain, maintain possession of the ball or to avoid opponent. These actions are often performed through unilateral process, with the contralateral leg incurring no ground contact. As a result, maintaining unilateral dynamic balance remains important. The aim of this study was to examine the relationship between dynamic balance (DB) and (COD) performance in young elite soccer players. METHODS: 20 right-footed young elite soccer players (age=16...
April 26, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28451905/effects-of-altitude-hypoxia-on-single-and-multiple-sprint-performance-a-comprehensive-review
#6
REVIEW
Olivier Girard, Franck Brocherie, Grégoire P Millet
Many sport competitions, typically involving the completion of single- (e.g. track-and-field or track cycling events) and multiple-sprint exercises (e.g. team and racquet sports, cycling races), are staged at terrestrial altitudes ranging from 1000 to 2500 m. Our aim was to comprehensively review the current knowledge on the responses to either acute or chronic altitude exposure relevant to single and multiple sprints. Performance of a single sprint is generally not negatively affected by acute exposure to simulated altitude (i...
April 27, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28118678/effect-of-sex-on-the-acute-skeletal-muscle-response-to-sprint-interval-exercise
#7
Lauren E Skelly, Jenna B Gillen, Martin J MacInnis, Brian J Martin, Adeel Safdar, Mahmood Akhtar, Maureen J MacDonald, Mark A Tarnopolsky, Martin J Gibala
What is the central question of this study? Are there sex-based differences in the acute skeletal muscle response to sprint interval training (SIT)? What is the main finding and its importance? In response to a SIT protocol that involved three 20 s bouts of 'all-out' cycling, the expression of multiple genes associated with mitochondrial biogenesis, metabolic control and structural remodelling was largely similar between men and women matched for fitness. Our findings cannot explain previous reports of sex-based differences in the adaptive response to SIT and suggest that the mechanistic basis for these differences remains to be elucidated...
January 24, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/27893474/hypertrophy-and-explosive-reactive-functioning-in-sedentary-men-following-10-weeks-of-whole-body-vibration
#8
Jens Ebing, Ulf Gast, Christoph Hauptmann, Dieter Felsenberg, Daniel L Belavý
The objective of this study was to determine the impact of vertical (Power-plate; POW) and side-alternating (Galileo; GAL) whole-body vibration exercise on muscle mass and lower-limb neuromuscular function. Forty-three sedentary male subjects (18-30yr) randomized into three groups underwent two upper-body exercise sessions per week for 10 weeks. Two groups of subjects underwent additional squat exercises on the GAL (N=15) or POW (N=14) devices. The third group was control. On magnetic resonance imaging, volume of the thigh muscles was measured...
November 16, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27863188/the-use-of-2-conditioning-programs-and-the-fitness-characteristics-of-police-academy-cadets
#9
Charles Cocke, Jay Dawes, Robin Marc Orr
CONTEXT:  Police academy training must physically prepare cadets for the rigors of their occupational tasks to prevent injury and allow them to adequately perform their duties. OBJECTIVE:  To compare the effects of 2 physical training programs on multiple fitness measures in police cadets. DESIGN:  Cohort study. SETTING:  Police training academy. PATIENTS OR OTHER PARTICIPANTS:  We collected data from 70 male (age = 27...
November 2016: Journal of Athletic Training
https://www.readbyqxmd.com/read/27808004/interval-training-elicits-higher-enjoyment-versus-moderate-exercise-in-persons-with-spinal-cord-injury
#10
Todd A Astorino, Jacob S Thum
BACKGROUND: High intensity interval training (HIIT) is a robust and time-efficient approach to improve multiple health indices including maximal oxygen uptake (VO2max). Despite the intense nature of HIIT, data in untrained adults report greater enjoyment of HIIT versus continuous exercise (CEX). However, this has yet to be investigated in persons with spinal cord injury (SCI). OBJECTIVE: To examine differences in enjoyment in response to CEX and HIIT in persons with SCI...
November 3, 2016: Journal of Spinal Cord Medicine
https://www.readbyqxmd.com/read/27777094/dietary-nitrate-supplementation-improves-sprint-and-high-intensity-intermittent-running-performance
#11
Christopher Thompson, Anni Vanhatalo, Harry Jell, Jonathan Fulford, James Carter, Lara Nyman, Stephen J Bailey, Andrew M Jones
The influence of dietary nitrate (NO3(-)) supplementation on indices of maximal sprint and intermittent exercise performance is unclear. PURPOSE: To investigate the effects of NO3(-) supplementation on sprint running performance, and cognitive function and exercise performance during the sport-specific Yo-Yo Intermittent Recovery level 1 test (IR1). METHODS: In a double-blind, randomised, crossover study, 36 male team-sport players received NO3(-)-rich (BR; 70 mL·day(-1); 6...
October 21, 2016: Nitric Oxide: Biology and Chemistry
https://www.readbyqxmd.com/read/27754015/br-04-1management-of-treatment-resistant-hypertension
#12
David John Webb
Treatment-resistant hypertension (TRH) is defined as the failure to achieve an office BP target of <140/90 mmHg (<130/80 mmHg in patients with chronic kidney disease (CKD) or diabetes) in patients with hypertension (HT), despite adherence to at least 3 antihypertensive medications at optimal tolerated doses, ideally including a diuretic (Calhoun et al., Circulation 2008). TRH identifies patients with hard-to-treat HT, who might benefit from specialist investigation and treatment. Although some studies put the prevalence of TRH as >10%, these levels may be inflated by white-coat hypertension and poor adherence...
September 2016: Journal of Hypertension
https://www.readbyqxmd.com/read/27746738/the-physiological-mechanisms-of-performance-enhancement-with-sprint-interval-training-differ-between-the-upper-and-lower-extremities-in-humans
#13
Christoph Zinner, David Morales-Alamo, Niels Ørtenblad, Filip J Larsen, Tomas A Schiffer, Sarah J Willis, Miriam Gelabert-Rebato, Mario Perez-Valera, Robert Boushel, Jose A L Calbet, Hans-Christer Holmberg
To elucidate the mechanisms underlying the differences in adaptation of arm and leg muscles to sprint training, over a period of 11 days 16 untrained men performed six sessions of 4-6 × 30-s all-out sprints (SIT) with the legs and arms, separately, with a 1-h interval of recovery. Limb-specific VO2peak, sprint performance (two 30-s Wingate tests with 4-min recovery), muscle efficiency and time-trial performance (TT, 5-min all-out) were assessed and biopsies from the m. vastus lateralis and m. triceps brachii taken before and after training...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27642926/br-04-1management-of-treatment-resistant-hypertension
#14
David John Webb
Treatment-resistant hypertension (TRH) is defined as the failure to achieve an office BP target of <140/90 mmHg (<130/80 mmHg in patients with chronic kidney disease (CKD) or diabetes) in patients with hypertension (HT), despite adherence to at least 3 antihypertensive medications at optimal tolerated doses, ideally including a diuretic (Calhoun et al., Circulation 2008). TRH identifies patients with hard-to-treat HT, who might benefit from specialist investigation and treatment. Although some studies put the prevalence of TRH as >10%, these levels may be inflated by white-coat hypertension and poor adherence...
September 2016: Journal of Hypertension
https://www.readbyqxmd.com/read/27633940/validity-and-reliability-of-skill-related-fitness-tests-for-wheelchair-using-youth-with-spina-bifida
#15
Manon A Bloemen, Tim Takken, Frank J Backx, Marleen Vos, Cas L Kruitwagen, Janke F de Groot
OBJECTIVES: To determine content validity of the Muscle Power Sprint Test (MPST), and construct validity and reliability of the MPST, 10×5 Meter Sprint Test (10×5MST), slalom test, and One Stroke Push Test (1SPT) in wheelchair-using youth with spina bifida (SB). DESIGN: Clinimetric study. SETTING: Rehabilitation centers, SB outpatient services, and private practices. PARTICIPANTS: A convenience sample of children and adolescents (N=53; 32 boys, 21 girls; age range, 5-19y) with SB who use a manual wheelchair...
June 2017: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/27503717/acute-effects-of-a-dopamine-norepinephrine-reuptake-inhibitor-on-neuromuscular-performance-following-self-paced-exercise-in-cool-and-hot-environments
#16
Katrina Onus, Jack Cannon, Liz Liberts, Frank E Marino
Dopamine/norepinephrine (DA/NE) reuptake inhibitors have been used to manipulate the central mechanisms affecting arousal and motivation during exercise. Eight healthy, physically active males performed 30min fixed-intensity cycling at 50% Wmax followed by 30min of self paced time trial (TT) with each section interspersed with a 30 s maximal sprint at 9, 19 and 29min. The DA/NE re-uptake inhibitor administered was bupropion (BUP) versus a placebo (PLA) in either warm (32°C, BUP32 or PLA32) or moderate (20°C; BUP20, PLA20) ambient conditions...
August 2016: Journal of Thermal Biology
https://www.readbyqxmd.com/read/27442337/the-30-15-intermittent-fitness-test-can-it-predict-outcomes-in-field-tests-of-anaerobic-performance
#17
Brendan R Scott, Jacob A Hodson, Andrew D Govus, Ben J Dascombe
This study determined whether a composite assessment of intermittent fitness could be used to quantify performance in several anaerobic tasks. Fifty-two male recreational athletes (age: 24.3 ± 4.4 years; body mass: 85.1 ± 12.2 kg; height: 180.5 ± 7.0 cm) were recruited from various team sports. Participants completed a battery of field tests to assess sprinting speed (40-m sprint), acceleration ability (10-m sprint), change of direction speed (505 test), anaerobic capacity (300-m shuttle), lower-body power (vertical jump), and repeated-sprint ability and the 30-15 Intermittent Fitness Test to determine the velocity of intermittent fitness (VIFT)...
October 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27232555/sustainability-and-repeatability-of-post-activation-potentiation
#18
Tristan McLaren, Deborah L King, Gary Sforzo
BACKGROUND: This study investigated the duration and repeatability of post-activation potentiation (PAP) benefits within a single exercise session. Specifically examined were the recurring effects, over multiple sets, of heavy back squats on repeated sprint times. METHODS: A partially randomized, counterbalanced, repeated measures design was implemented using 29 college-aged male NCAA varsity field sport athletes participating in PAP and control conditions. Subjects performed four repetitions of back squats (PAP = 90% 1RM; control = 20% 1RM), rested 8 min, performed a set of four 40-m sprints (55 s inter-repetition active recovery) and rested for 8 min after the last sprint...
May 27, 2016: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/27112285/atriocaval-rupture-after-right-atrial-isthmus-ablation-for-atrial-flutter
#19
Caroline Vloka, Daniel W Nelson, Jule Wetherbee
A patient with symptomatic typical atrial flutter (AFL) underwent right atrial isthmus ablation with an 8-mm catheter. Eight months later, his typical AFL recurred. Ten months later, he underwent a repeat right atrial isthmus ablation with an irrigated tip catheter and an 8-mm tip catheter. Six weeks after his second procedure, while performing intense sprint intervals on a treadmill, he developed an abrupt onset of chest pain, hypotension, and cardiac tamponade. He underwent emergency surgery to repair an atriocaval rupture and has done well since...
June 1, 2016: American Journal of Cardiology
https://www.readbyqxmd.com/read/27074436/evidencing-the-association-between-swimming-capacities-and-performance-indicators-in-water-polo-a-multiple-regression-study
#20
Dean Kontic, Natasa Zenic, Ognjen Uljevic, Damir Sekulic, Blaz Lesnik
BACKGROUND: Swimming capacities are hypothesized to be important determinants of water polo performance but there is an evident lack of studies examining different swimming capacities in relation to specific offensive and defensive performance variables in this sport. The aim of this study was to determine the relationship between five swimming capacities and six performance determinants in water polo. METHODS: The sample comprised 79 high-level youth water polo players (all males, 17-18 years of age)...
June 2017: Journal of Sports Medicine and Physical Fitness
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