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Multiple sprint exercise

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
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
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
Manon At Bloemen, Tim Takken, Frank Jg Backx, Marleen Vos, Cas Ljj Kruitwagen, Janke F de Groot
OBJECTIVE: To determine content validity of the Muscle Power Sprint Test (MPST) and construct validity and reliability of the MPST, 10x5 Meter Sprint Test (10x5MST), 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, private practices PARTICIPANTS: A convenience sample of 53 children (5-19 years, 32 boys / 21 girls) with SB who use a manual wheelchair...
September 12, 2016: Archives of Physical Medicine and Rehabilitation
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
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 yr; 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, as well as the 30-15 Intermittent Fitness Test to determine the velocity of intermittent fitness (VIFT)...
July 16, 2016: Journal of Strength and Conditioning Research
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
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
Dean Kontic, Natasa Zenic, Ognjen Uljevic, Damir Sekulic, Blaz Lesnik
BACKGROUND: Swimming capacities are hypothesised 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)...
April 13, 2016: Journal of Sports Medicine and Physical Fitness
Nicolas Wirtz, Christoph Zinner, Ulrike Doermann, Heinz Kleinoeder, Joachim Mester
The aim of the present study was to investigate the effects of a multiple set squat exercise training intervention with superimposed electromyostimulation (EMS) on strength and power, sprint and jump performance. Twenty athletes from different disciplines participated and were divided into two groups: strength training (S) or strength training with superimposed EMS (S+E). Both groups completed the same training program twice a week over a six week period consisting of four sets of the 10 repetition maximum of back squats...
March 2016: Journal of Sports Science & Medicine
Irineu Loturco, Ciro Winckler, Ronaldo Kobal, Cesar C Cal Abad, Katia Kitamura, Amaury W Veríssimo, Lucas A Pereira, Fábio Y Nakamura
The aims of this study were to estimate the magnitude of variability and progression in actual competitive and field vertical jump test performances in elite Paralympic sprinters with visual impairment in the year leading up to the 2015 Parapan American Games, and to investigate the relationships between loaded and unloaded vertical jumping test results and actual competitive sprinting performance. Fifteen Brazilian Paralympic sprinters with visual impairment attended seven official competitions (four national, two international and the Parapan American Games 2015) between April 2014 and August 2015, in the 100- and 200-m dash...
2015: Frontiers in Physiology
Clyde Williams, Ian Rollo
The common pattern of play in 'team sports' is 'stop and go', i.e. where players perform repeated bouts of brief high-intensity exercise punctuated by lower intensity activity. Sprints are generally 2-4 s long and recovery between sprints is of variable length. Energy production during brief sprints is derived from the degradation of intra-muscular phosphocreatine and glycogen (anaerobic metabolism). Prolonged periods of multiple sprints drain muscle glycogen stores, leading to a decrease in power output and a reduction in general work rate during training and competition...
November 2015: Sports Medicine
Laurent B Seitz, G Gregory Haff
BACKGROUND: Although post-activation potentiation (PAP) has been extensively examined following the completion of a conditioning activity (CA), the precise effects on subsequent jump, sprint, throw, and upper-body ballistic performances and the factors modulating these effects have yet to be determined. Moreover, weaker and stronger individuals seem to exhibit different PAP responses; however, how they respond to the different components of a strength-power-potentiation complex remains to be elucidated...
February 2016: Sports Medicine
Brian M Williams, Robert R Kraemer
The purpose of this study was to determine the effectiveness of a novel exercise protocol we developed for kettlebell high-intensity interval training (KB-HIIT) by comparing the cardiorespiratory and metabolic responses to a standard sprint interval cycling (SIC) exercise protocol. Eight men volunteered for the study and completed 2 preliminary sessions, followed by two 12-minute sessions of KB-HIIT and SIC in a counterbalanced fashion. In the KB-HITT session, 3 circuits of 4 exercises were performed using a Tabata regimen...
December 2015: Journal of Strength and Conditioning Research
Nathan Elsworthy, Darren Burke, Ben J Dascombe
The onset of exercise facilitates an improvement in psychomotor performance until the second ventilatory threshold, after which performance is reduced. This inverted-U relationship appears valid for incremental and steady-state exercise, however, not for intermittent exercise. This study examined changes in psychomotor performance of team sport officials during a laboratory-based match simulation. Twelve elite Australian football (n = 5) and rugby league (n = 7) officials (32.5 ± 5.5 years; 180.0 ± 6...
2016: Journal of Sports Sciences
Julio Tous-Fajardo, Oliver Gonzalo-Skok, José Luis Arjol-Serrano, Per Tesch
PURPOSE: To examine the effects of a novel isoinertial eccentric-overload and vibration training (EVT) paradigm on change-of-direction (COD) speed and multiple performance tests applicable to soccer. METHODS: Twenty-four young male players were assigned to an EVT (n = 12) or conventional combined (CONV, n = 12) group, once weekly for 11 wk. EVT consisted of 2 sets of 6-10 repetitions in 5 specific and 3 complementary exercises. CONV used comparable volume (2 sets of 6-10 reps in 3 sequences of 3 exercises) of conventional combined weight, plyometric, and linear speed exercises...
January 2016: International Journal of Sports Physiology and Performance
Mohamed Souhaiel Chelly, Souhail Hermassi, Roy J Shephard
We studied the effect of supplementing normal in-season training by a 10-week lower limb plyometric training program (hurdle and depth jumping), examining measures of competitive potential (peak power output [PP], sprint running velocity, squat jump [SJ], countermovement jump [CMJ], drop jump [DJ], and lower limb muscle volume). The subjects (27 male track athletes, aged 11.9 ± 1.0 years; body mass: 39.1 ± 6.1 kg; height: 1.56 ± 0.02 m; body fat: 12.8 ± 4.4%) were randomly assigned between a control (normal training) group (C; n = 13) and an experimental group (E; n = 14) who also performed plyometric training 3 times per week...
August 2015: Journal of Strength and Conditioning Research
Rodrigo Ramírez-Campillo, Francisco Gallardo, Carlos Henriquez-Olguín, Cesar M P Meylan, Cristian Martínez, Cristian Álvarez, Alexis Caniuqueo, Eduardo L Cadore, Mikel Izquierdo
The aim of this study was to compare the effects of 6 weeks of vertical, horizontal, or combined vertical and horizontal plyometric training on muscle explosive, endurance, and balance performance. Forty young soccer players aged between 10 and 14 years were randomly divided into control (CG; n = 10), vertical plyometric group (VG; n = 10), horizontal plyometric group (HG; n = 10), and combined vertical and horizontal plyometric group (VHG; n = 10). Players performance in the vertical and horizontal countermovement jump with arms, 5 multiple bounds test (MB5), 20-cm drop jump reactive strength index (RSI20), maximal kicking velocity (MKV), sprint, change of direction speed (CODS), Yo-Yo intermittent recovery level 1 test (Yo-Yo IR1), and balance was measured...
July 2015: Journal of Strength and Conditioning Research
Julie Y Kresta, Jonathan M Oliver, Andrew R Jagim, James Fluckey, Steven Riechman, Katherine Kelly, Cynthia Meininger, Susanne U Mertens-Talcott, Christopher Rasmussen, Richard B Kreider
BACKGROUND: The purpose of this study was to examine the short-term and chronic effects of β-ALA supplementation with and without creatine monohydrate on body composition, aerobic and anaerobic exercise performance, and muscle carnosine and creatine levels in college-aged recreationally active females. METHODS: Thirty-two females were randomized in a double-blind, placebo-controlled manner into one of four supplementation groups: β-ALA only (BA, n = 8), creatine only (CRE, n = 8), β-ALA and creatine combined (BAC, n = 9) and placebo (PLA, n = 7)...
2014: Journal of the International Society of Sports Nutrition
Keeron J Stone, Michael G Hughes, Michael R Stembridge, Robert W Meyers, Daniel J Newcombe, Jon L Oliver
The aim of this study was to investigate the effect of playing surface on physiological and performance responses during and in the 48 h after simulated soccer match play. Blood lactate, single-sprint, repeated-sprint and agility of eight amateur soccer players were assessed throughout a 90-min soccer-simulation protocol (SSP) completed on natural turf (NT) and artificial turf. Counter-movement jump, multiple-rebound jump, sprint (10 m, 60 m), L-agility run (L-AR), creatine kinase (CK) and perception of muscle soreness (PMS) were measured before, immediately after, 24 h and 48 h after exercise...
2016: European Journal of Sport Science
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