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https://www.readbyqxmd.com/read/27893479/complex-training-the-effect-of-exercise-selection-and-training-status-on-post-activation-potentiation-in-rugby-league-players
#1
David J Scott, Massimiliano Ditroilo, Phil Marshall
This study compared the post-activation potentiation (PAP) response of the hex bar deadlift (HBD) and back squat (BS) exercises. The PAP response between different levels of athletes was also compared. Ten professional and ten amateur rugby league players performed two experimental sessions. Participants performed a countermovement jump (CMJ) before and 2, 4, 6, 8, 10, 12, 14 and 16 minutes after a conditioning activity (CA) that contained 1 set of 3 repetitions at 93% 1RM of either HBD or BS. A force platform determined peak power output (PPO), force at PPO, velocity at PPO and jump height of each CMJ...
November 16, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27870696/strength-and-conditioning-and-concurrent-training-practices-in-elite-rugby-union
#2
Thomas W Jones, Andrew Smith, Lindsay S Macnaughton, Duncan N French
Jones, TW, Smith, A, Macnaughton, LS, and French, DN. Strength and Conditioning and Concurrent Training Practices in Elite Rugby Union. J Strength Cond Res 30(12): 3354-3366, 2016-There is limited published research on strength and conditioning (S&C) practices in elite rugby union (RU). Information regarding testing batteries and programme design would provide valuable information to both applied practitioners and researchers investigating the influence of training interventions or preperformance strategies...
December 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
#3
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 18, 2016: Journal of Athletic Training
https://www.readbyqxmd.com/read/27843418/effects-of-acute-carbohydrate-ingestion-on-anaerobic-exercise-performance
#4
Ben M Krings, Jaden A Rountree, Matthew J McAllister, Patrick M Cummings, Timothy J Peterson, Brent J Fountain, JohnEric W Smith
BACKGROUND: Carbohydrate (CHO) supplementation during endurance exercises has been shown to increase performance, but there is limited research with CHO supplementation during strength and conditioning exercises. Therefore, the purpose of this study was to examine the effects of various levels of CHO ingestion during acute testing sessions requiring participants to complete a strength and conditioning program designed for collegiate athletes. METHODS: Participants (n = 7) performed a series of exercises while ingesting an amino-acid electrolyte control (CON) or CON plus varying levels of CHO...
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/27822169/the-effect-of-six-days-of-dietary-nitrate-supplementation-on-performance-in-trained-crossfit-athletes
#5
Samuel J Kramer, Daniel A Baur, Maria T Spicer, Matthew D Vukovich, Michael J Ormsbee
BACKGROUND: While it is well established that dietary nitrate reduces the metabolic cost of exercise, recent evidence suggests this effect is maintained 24 h following the final nitrate dose when plasma nitrite levels have returned to baseline. In addition, acute dietary nitrate was recently reported to enhance peak power production. Our purpose was to examine whether chronic dietary nitrate supplementation enhanced peak power 24 h following the final dose and if this impacted performance in a heavily power-dependent sport...
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/27787464/the-effects-of-eccentric-contraction-duration-on-muscle-strength-power-production-vertical-jump-and-soreness
#6
Jonathan Mike, Nathan Cole, Chris Herrera, Trisha McLain, Len Kravitz, Chad Kerksick
Prior research has investigated the effects of either eccentric-only training or comparing eccentric and concentric exercise on changes related to strength and power expression, but no research to date has investigated the impact of altering the duration of either the concentric or eccentric component on these parameters. Therefore, the purpose of this study was to assess the duration of eccentric (i.e. 2-second, 4-second vs. 6-second) muscle contractions and their effect on muscle strength, power production, vertical jump and soreness using a plate-loaded barbell Smith squat exercise...
October 20, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27676877/the-acute-effects-of-dynamic-and-static-stretching-on-the-knee-isokinetic-muscle-strength-and-balance-control-in-athletes
#7
Imen Fekhfekh, Abdelmoneem Yahia, Mokhtar Chaabene, Salma Jribi, Nizar Suissi, Mohamed Habib Elleuch, Sameh Ghroubi
OBJECTIVE: To study the acute effect of static and dynamic stretching on the knee muscle strength and postural capacity in athletes. PATIENTS AND METHODS: Fifteen judokas performed 2 stretching protocols (static and dynamic) on the muscles of both lower limbs with an interval of 48hours in a random order. An evaluation of the dominant knee muscle strength with an isokinetic dynamometer CybexNormII was performed before and after each stretching protocol in a concentric mode at a speed of 60 and 180°/s...
September 2016: Annals of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/27676874/athletic-injury-prevention-determinants-of-sprint-performance
#8
Pascal Edouard, Pierrick Arnal, Philippe Gimenez, Pierre Samozino, Pedro Jimenez-Reyes, Matt Brughelli, Jurdan Mendiguchia, Jean-Benoit Morin
OBJECTIVE: The hamstring muscles are the most injured muscles in athletes practicing sprints. However, they seem greatly contributing to the production of horizontal force, a key element in the sprint acceleration performance. The aim of our study was to experimentally analyse the link between the production of horizontal force and strength of the hamstrings at maximum sprints on a treadmill and in fatigue conditions. PATIENTS AND METHODS: Fourteen male subjects accustomed to sprint participated in the experiment consisting in 12 6-seconds sprints separated by 44seconds of recovery on an instrumented treadmill sprint for measuring the horizontal force, coupled with the simultaneous recording of the EMG activity of the vastus lateralis, rectus biceps femoris and gluteus muscles...
September 2016: Annals of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/27676816/hamstring-injury-prevention-contributions-of-biomechanics
#9
Pascal Edouard, Pierre Samozino, Romain Slotala, Jurdan Mendiguchia, Jean-Benoit Morin
Hamstring muscle injury is the main injury related to athletics, but also other sports including acceleration and sprints, with important consequences (time loss of sport and re-injury risk). In a prevention approach, a better knowledge of risk factors and mechanisms of these lesions seem relevant, and it can pass through a better understanding of the biomechanical and muscular determinants of performance in sprint and acceleration. The ability to produce a horizontal force on the ground [i.e. orienting the total push backward (or ground force reaction forward)], and to do so despite the increase in running speed, is an important determinant of sprint performance...
September 2016: Annals of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/27669181/the-effects-of-accentuated-eccentric-loading-on-the-drop-jump-exercise-and-the-subsequent-postactivation-potentiation-response
#10
Lee A Bridgeman, Michael R McGuigan, Nicholas D Gill, Deborah Dulson
The aims of this study were to (A) investigate the acute effects of different drop jump (DJ) accentuated eccentric loading (AEL) protocols and (B) to investigate the effect of these AEL DJ protocols on subsequent countermovement jump (CMJ) performance. The subjects were 12 strength-trained athletes, initially, baseline CMJ performance was assessed and individual optimal DJ drop height identified. In subsequent weeks subjects completed 1 set of 5 DJ's with no additional load or an AEL of 10, 20 or 30% of their individual body mass (BM) utilising dumbbells to provide the extra load...
September 16, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27661792/spinal-exercise-prescription-in-sport-classifying-physical-training-and-rehabilitation-by-intention-and-outcome
#11
Simon Spencer, Alex Wolf, Alison Rushton
CONTEXT: Identification of strategies to prevent spinal injury, optimize rehabilitation, and enhance performance is a priority for practitioners. Different exercises produce different effects on neuromuscular performance. Clarity of the purpose of a prescribed exercise is central to a successful outcome. Spinal exercises need to be classified according to the objective of the exercise and planned physical outcome. OBJECTIVE: To define the modifiable spinal abilities that underpin optimal function during skilled athletic performance, clarify the effect of spinal pain and pathologic conditions, and classify spinal exercises according to the objective of the exercise and intended physical outcomes to inform training and rehabilitation...
August 2016: Journal of Athletic Training
https://www.readbyqxmd.com/read/27632577/the-neuromuscular-qualities-of-higher-and-lower-level-mixed-martial-arts-competitors
#12
Lachlan P James, Emma M Beckman, Vincent G Kelly, G Gregory Haff
PURPOSE: To determine whether the maximal strength, impulse and power characteristics of competitive mixed martial arts (MMA) athletes differ according to competition level. METHODS: Twenty-nine male semi-professional and amateur MMA competitors were stratified into either higher-level (HL) or lower-level (LL) performers on the basis of competition grade and success. The one-repetition maximum (1RM) squat was used to assess lower body dynamic strength, while a spectrum of impulse, power, force and velocity variables were evaluated during an incremental load jump squat...
September 15, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27618471/contrast-loading-increases-upper-body-power-output-in-junior-volleyball-athletes
#13
Ilias Smilios, Konstantinos Sotiropoulos, Karolina Barzouka, Marios Christou, Savvas P Tokmakidis
PURPOSE: This study examined the acute effects of contrast loading on mechanical power output during bench-press throws in junior volleyball players. METHOD: Eleven males (age: 16.5±0.5 years) performed a contrast loading and a control protocol. The contrast protocol included the execution of 3 bench-throws with a 30% load of 1RM, after 3 min a conditioning set of 5 bench-throws with a 60% load of 1RM and after 3 and 5 min two more sets of 3 bench-throws with a 30% load of 1RM...
September 6, 2016: Pediatric Exercise Science
https://www.readbyqxmd.com/read/27610060/the-effects-of-below-knee-compression-garments-on-functional-performance-in-individuals-with-parkinson-disease
#14
Veronica Southard, Joanne DiFrancisco-Donoghue, James Mackay, Stephanie Idjadi, Neil Wright
BACKGROUND: Symptoms of Parkinson's disease (PD) include bradykinesia, gait abnormalities, balance deficits, restless leg syndrome, and muscular fatigue. Compression garments (CG) have been shown to improve performance in athletes by increasing venous return and reduce lactic acid. OBJECTIVE: Assess the effect of compression garments on the performance of 3 standardized functional tests in persons with PD. METHODOLOGY: The functional tests selected represented strength, endurance, and mobility measures in individuals with PD...
July 2016: International Journal of Health Sciences
https://www.readbyqxmd.com/read/27601779/hang-cleans-and-hang-snatches-produce-similar-improvements-in-female-collegiate-athletes
#15
J L Ayers, M DeBeliso, T G Sevene, K J Adams
Olympic weightlifting movements and their variations are believed to be among the most effective ways to improve power, strength, and speed in athletes. This study investigated the effects of two Olympic weightlifting variations (hang cleans and hang snatches), on power (vertical jump height), strength (1RM back squat), and speed (40-yard sprint) in female collegiate athletes. 23 NCAA Division I female athletes were randomly assigned to either a hang clean group or hang snatch group. Athletes participated in two workout sessions a week for six weeks, performing either hang cleans or hang snatches for five sets of three repetitions with a load of 80-85% 1RM, concurrent with their existing, season-specific, resistance training program...
September 2016: Biology of Sport
https://www.readbyqxmd.com/read/27543402/return-to-play-after-lumbar-spine-surgery
#16
REVIEW
Ralph W Cook, Wellington K Hsu
Surgical management of lumbar spine conditions can produce excellent outcomes in athletes. Microdiscectomy for lumbar disc herniation has favorable outcomes; most athletes return to play at preoperative performance levels. Direct pars repair is successful in younger athletes, with high rates of return to play for a variety of fixation techniques. Fusion in athletes with scoliosis is a negative predictor. There are few evidence-based return to play criteria. Athletes should demonstrate full resolution of symptoms and flexibility, endurance, and strength before returning to play...
October 2016: Clinics in Sports Medicine
https://www.readbyqxmd.com/read/27525185/chronic-ucl-injury-a-multimodal-approach-to-correcting-altered-mechanics-and-improving-healing-in-a-college-athlete-a-case-report
#17
Rachel Patrick, Josh McGinty, Ann Lucado, Beth Collier
BACKGROUND: Ulnar collateral ligament (UCL) tears and associated Tommy Johns surgical intervention from excessive and poor quality pitching has increased immensely-with more college and professional pitchers undergoing the surgery in 2014 alone than in the 1990s as a whole.(1) Faulty mechanics developed at young ages are often well-engrained by the late adolescent years and the minimal healing ability of the largely avascular UCL often leads to delayed safe return to sport.(2). PURPOSE: The purpose of this case study was to describe an innovative, multimodal approach to conservative management of a chronic UCL injury in a college-aged baseball pitcher...
August 2016: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/27525184/screening-for-referral-by-a-sports-physical-therapist-reveals-an-effort-thrombosis-in-a-collegiate-pitcher-a-case-report
#18
William R VanWye, Jase Pinerola, Karen Craig Ogle, Harvey W Wallmann
BACKGROUND AND PURPOSE: Screening for referral, regardless of setting, is the responsibility of all physical therapists. A serious condition that sports physical therapists may encounter is upper extremity (UE) deep venous thrombosis (DVT), which can result in the important and sometimes fatal complication of pulmonary embolism. CASE DESCRIPTION: A 22 year-old male right-hand dominant collegiate pitcher was referred for physical therapist evaluation and treatment secondary to acute right UE pain and swelling...
August 2016: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/27497636/protective-effects-of-the-roots-of-angelica-sinensis-on-strenuous-exercise-induced-sports-anemia-in-rats
#19
Chih-Wei Chang, Yi-Ming Chen, Yi-Ju Hsu, Chi-Chang Huang, Yu-Tse Wu, Mei-Chich Hsu
ETHNOPHARMACOLOGICAL RELEVANCE: Sports anemia is a persistent and severe problem in athletes owing to strenuous exercise-induced oxidative stress and hepcidin upregulation. The roots of Angelica sinensis (AS), a familiar traditional Chinese medicine, has been used for replenishing blood since antiquity. AIM OF THE STUDY: To evaluate the effects of ethanolic AS extract in a 4-week study on sports anemia in female Wistar rats. MATERIALS AND METHODS: To induce anemia, a strenuous exercise protocol consisting of running and swimming was employed with increasing intensity...
August 3, 2016: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/27486490/cardiac-imaging-in-athletes
#20
Asaad A Khan, Lucy Safi, Malissa Wood
Athletic heart syndrome refers to the physiological and morphological changes that occur in a human heart after repetitive strenuous physical exercise. Examples of exercise-induced changes in the heart include increases in heart cavity dimensions, augmentation of cardiac output, and increases in heart muscle mass. These cardiac adaptations vary based on the type of exercise performed and are often referred to as sport-specific cardiac remodeling. The hemodynamic effects of endurance and strength training exercise lead to these adaptations...
April 2016: Methodist DeBakey Cardiovascular Journal
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