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Journal of Sports Medicine and Physical Fitness

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https://www.readbyqxmd.com/read/28409517/could-the-negative-effects-of-static-stretching-in-warm-up-be-restored-by-sport-specific-exercise
#1
Victor Bengtsson, Ji-Guo Yu, Kajsa Gilenstam
BACKGROUND: Static stretching (SS) is widely used in warm-up as it is generally believed to increase mobility and reduce the risk of injury; however, SS has been shown to induce transient negative effects on subsequent muscle performance. Interestingly, recent studies have shown that sport specific exercise could restore SS-induced negative effects on certain sports, especially of explosive muscular performance. Whether sport specific exercise could restore SS-induced negative effects on isokinetic muscle performance remains unclear...
April 13, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28409516/relationships-between-fitness-test-and-kicking-velocity-in-young-soccer-players
#2
Víctor Torreblanca-Martínez, José A González-Jurado, Fernando M Otero-Saborido
BACKGROUND: To study the relation between fitness test and kicking velocity in young soccer players, which has not been previously studied in this group of age. METHODS: Ninety eight Under-11 soccer players who belonged to two professional Spanish clubs and two amateur clubs were subjected to sprint test (15 and 30 meters), CMJ (Countermovement Jump), estimation of maximal oxygen intake (VO2max), kicking velocity test, fatigue index of jump height and anthropometrical measures...
April 13, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28409515/effects-of-stretching-and-fatigue-on-peak-torque-muscle-imbalance-and-stability
#3
Pablo B Costa, Cassio V Ruas, Cory M Smith
BACKGROUND: The present study examined the acute effects of hamstrings stretching and fatigue on knee extension and flexion peak torque (PT), hamstrings to quadriceps (H:Q) ratio, and postural stability. METHODS: Seventeen women (mean ± SD age = 21.8 ± 2.1 yrs; body mass = 63.0 ± 10.5 kg; height = 164.7 ± 6.2 cm) and eighteen men (25.8 ± 4.6 yrs; 83.6 ± 13.2 kg; 175.3 ± 6.0 cm) took part in three laboratory visits. The first visit was a familiarization session, and the subsequent two visits were randomly assigned as a control or stretching condition...
April 13, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28409514/neck-strength-and-self-reported-neck-dysfunction-what-is-the-impact-of-a-season-of-rugby-union
#4
Danielle M Salmon, S John Sullivan, Phil Handcock, Nancy J Rehrer, Brian Niven
BACKGROUND: Neck strength has been reported to reduce the incidence of concussions and neck injuries. However little is known about how neck strength changes over a playing season. AIM: To understand the impact a 20-week rugby season has on neck strength, neck pain (NP) and neck stiffness (NS) in a cohort of rugby players, relative to a non-contact control group. METHODS: This prospective cohort study employed a fixed-frame dynamometer to measure neck strength in a simulated contact posture in rugby players (n=32) and controls (n=15)...
April 13, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28409513/effects-of-arm-insulation-on-physiological-responses-during-running-in-the-cold
#5
Ryo Ito, Naoyuki Yamashita, Takaaki Matsumoto
BACKGROUND: Individuals who exercise outdoors in winter expose themselves to cold conditions, which have detrimental effects on physiological responses and exercise performance. Many runners wear arm warmers to protect against cold. However, the effects of these warmers remain unclear. This study aimed to determine the effect of arm insulation on physiological responses during running in a cold environment. METHODS: Twelve healthy men (mean ± SD age, 22.4 ± 3...
April 13, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28409512/immediate-effects-of-different-types-of-stretching-exercises-on-badminton-jump-smash
#6
Hwi S Jang, Daeho Kim, Jihong Park
BACKGOUND: Since different types of stretching exercises may alter athletic performance, we compared the effects of three types of stretching exercises on badminton jump smash. METHODS: Sixteen male collegiate badminton players performed one of three different stretching exercises in a counterbalanced order on different days. Static stretching had seven typical stretches, while dynamic stretching involved nine dynamic movements, and resistance dynamic stretching was performed with weighted vests and dumbbells...
April 13, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28409511/multimodal-assessment-of-sensorimotor-shoulder-function-in-patients-with-untreated-anterior-shoulder-instability-and-asymptomatic-handball-players
#7
Guillaume Mornieux, Anja Hirschmüller, Albert Gollhofer, Norbert P Südkamp, Dirk Maier
BACKGROUND: Functional evaluation of sensorimotor function of the shoulder joint is important for guidance of sports-specific training, prevention and rehabilitation of shoulder instability. Such assessment should be multimodal and comprise all qualities of sensorimotor shoulder function. This study evaluates feasibility of such multimodal assessment of glenohumeral sensorimotor function in patients with shoulder instability and handball players. METHODS: Nine patients with untreated anterior instability of their dominant shoulder and 15 asymptomatic recreational handball players performed proprioceptive joint position sense and dynamic stabilisation evaluations on an isokinetic device, as well as a functional throwing performance task...
April 13, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28409510/combined-osteopathy-and-exercise-management-of-achilles-tendinopathy-in-an-athlete-a-case-report
#8
Georgia Ross, Chris Macfarlane, Brett Vaughan
Mid-portion Achilles tendinopathy is a common injury in sporting populations. There is conflicting evidence about the best approach to conservative management. This report focuses on the rehabilitation of an Achilles tendinopathy utilising osteopathic manual therapy (OMT) and a structured exercise program in a semi-professional volleyballer. The patient presented with a 4-month history of right mid-portion Achilles tendon pain that begun after a lateral inversion sprain of the right ankle. The primary complaint was pain impacting the patients vertical jump performance...
April 13, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28409509/fitness-can-be-a-determinant-of-arterial-stiffness-in-healthy-adult-men-a-cross-sectional-study
#9
Jin-Wook Chung, Mi-Lyang Kim, Youngsoo Jin, Yonghwan Kim, Jeeyoung Hong
BACKGROUND: Fitness is known to influence arterial stiffness. This study aimed to assess differences in cardiorespiratory endurance, muscular strength, and flexibility according to arterial stiffness, based on sex and age. METHODS: We enrolled 1,590 healthy adults (men: 1,242, women: 348) who were free of metabolic syndrome. We measured cardiorespiratory endurance in an exercise stress test on a treadmill, muscular strength by a grip test, and flexibility by upper body forward-bends from a standing position...
April 13, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28409508/performance-of-muscle-strength-and-fatigue-tolerance-in-young-trained-women-supplemented-with-caffeine
#10
Carlos A Fett, Natalia Magalhães Aquino, Jairo Schantz, Camila F Brandão, Joás D de Araújo Cavalcanti, Waleria C Rezende Fett
BACKGROUND: Verify the effect of caffeine supplementation on the muscular strength and fatigue tolerance of young trained women. METHODS: Eight women of 25±5 years old, who had undergone a minimum of 12 months of continuous resisted training, body mass index 20-23 kg/m2 were submitted to four tests: one repetition maximum (1- RM, kg) to pull down (PD), hack squat (HS), bench press (BP), and; knee extension exhaustion (drop-set, 100/80/60 kg, repetitions) (DS). They perform the tests in four consecutive blocks one-week apart crossover system: basal without caffeine (B); first caffeine (C1); placebo with starch supplementation (P); second caffeine (C2)...
April 13, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28362075/association-between-the-number-of-daily-steps-and-the-cardiovascular-risk-factors-in-basic-education-teachers
#11
Renata A Rodrigues de Oliveira, Paulo R Dos Santos Amorim, Rômulo J Mota, Debora D Ferreira Tavares, Fernanda Rocha de Faria, Osvaldo Costa Moreira, Luciana Moreira Lima, Raquel Rodrigues Britto, João C Bouzas Marins
BACKGROUND: Regular physical activity is suggested as an important non pharmacological mechanism to prevent cardiovascular diseases. Thus, the objective the presente study was to verify the association of the number of daily steps with cardiovascular risk factors in basic education teachers and analyze the suitability of the cutoff of 10,000 steps/day as a predictor for the main risk factors in this sample. METHODS: 200 teachers (43.2 + 10.2 years) of basic education were assessed in Viçosa-MG, Brazil...
March 30, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28362074/validity-and-reliability-of-submaximal-fitness-tests-based-on-perceptual-variables
#12
Matteo Crotti, Andrea Bosio, Pietro L Invernizzi
BACKGROUND: Few studies examined the validity of fitness tests based on perception scales. The field-based fitness tests batteries are composed by maximal tests and currently, a battery of submaximal tests does not exist. METHODS: Seventeen physically active male participants (age 40,5 ± 10,7 years) performed the Multistage fitness test, the Crunch test, the Push-up test and a Trunk flexion test with a sub maximal protocol based on perceptual variables that were defined as non-validated submaximal...
March 30, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28249384/influence-of-a-mini-trampoline-rebound-exercise-program-on-insulin-resistance-lipid-profile-and-central-obesity-in-individuals-with-type-2-diabetes
#13
Jibril M Nuhu, Sonill S Maharaj
BACKGROUND: Exercises are important as an adjuvant for managing diabetes but due to fatigue and time constraints, individuals with diabetes may not engage in them. Jumping on a mini-trampoline referred to as rebound exercise is an aerobic activity used for exercise training benefits but only little research is available on its effects in diabetes. The purpose of this study was to determine the effect of mini-trampoline rebound exercise on insulin resistance and lipid profile in type 2 diabetics...
March 1, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28249383/validation-of-three-short-physical-activity-questionnaires-with-accelerometers-among-university-students-in-spain
#14
Sheila Rodríguez-Muñoz, Cristina Corella, Alberto Abarca-Sos, Javier Zaragoza
BACKGROUND: Physical activity (PA) in university students has not been analyzed with specific questionnaires tailored to this population. Therefore, the purpose of this study was to analyse the validity of three PA questionnaires developed on other populations comparing with accelerometer values: counts and moderate to vigorous PA (MVPA) calculated with uniaxial and triaxial cut points. METHODS: 145 (92 women) university students from Spain wore an accelerometer GT3X or GTX+ to collect PA data of 7 full days...
March 1, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28229578/growth-and-pubertal-development-in-adolescent-male-wrestlers
#15
İbrahim E Pişkin, Mustafa Gümüş, Taner Bayraktaroğlu, Tevfik C Akalin, Faruk Yamaner
BACKGROUND: Adolescence is a crucial period for linear growth, and sports training during this time may have positive or negative effects on some physiological processes as growth. The purpose of this study was to evaluate the effects of intense training during somatic growth on the onset of puberty and growth development in adolescent wrestlers. METHODS: Fifty adolescent male wrestlers and twenty-one sedentary healthy male controls aged between 13-15 years were selected...
February 22, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28229577/maximal-aerobic-capacity-can-be-increased-by-enhancing-performers-expectancies
#16
Jeff Montes, Gabriele Wulf, James W Navalta
BACKGROUND: Maximum aerobic capacity (VO2max) is widely accepted as the best measure of cardiovascular fitness and aerobic power. The present study investigated whether enhancing participants' performance expectancies through positive social-comparative feedback would increase VO2max. METHODS: Participants were experienced runners who regularly ran for exercise or competitively. All participants completed two VO2max tests within a 2-week period at similar times of the day...
February 22, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28229576/hormonal-responses-during-two-different-concurrent-training-trials-in-youth-elite-soccer-players-does-changing-the-organisation-of-training-impact-the-hormonal-response-to-concurrent-exercise
#17
Kevin Enright, James Morton, John Iga, Barry Drust
BACKGROUND: There are no data describing the acute hormonal responses to concurrent- training programmes in youth elite soccer players. Therefore, the aim of this study was to describe the total testosterone (T), cortisol (C), and growth hormone (hGH) responses during two same-day concurrent-training (CT) trials in elite soccer players. METHODS: n=13 youth elite players (age: 17.0±0.2 yrs; height, 1.80±0.07 m; body mass, 73.1±5.7 kg; VO2 max, 64.4±4.8ml-1.kg-1...
February 22, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28229575/effects-of-a-low-volume-plyometric-training-in-anaerobic-performance-of-adolescent-athletes
#18
Ari R Assunção, Martim Bottaro, Euler A Cardoso, Daiane P Dantas da Silva, Marcelo Ferraz, Carlos A Vieira, Paulo Gentil
BACKGROUND: Parameters related to the anaerobic capacity and power may be important for the performance of many sports whose skills are related to high-intensity and short- duration efforts. Although plyometric training (PT) has been widely used in the regular strength and conditioning programs of young athletes, its effects on anaerobic performance are still controversial. Therefore, the purpose of the present study was to evaluate the effects of PT in anaerobic performance in young athletes...
February 22, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28229574/athlete-presentations-and-sports-injury-frequencies-by-sport-branches-at-a-university-sports-medicine-clinic
#19
Bernard Tahirbegolli, Şensu Dinçer, Ömer B Gözübüyük, Ufuk Değirmenci, Safinaz Yildiz, Suphi Vehid
BACKGROUND: We aimed to investigate the profile of athletes by determining the branch of sports, type, and area of sustained sports injury, and the frequencies through athletes' presentations to the largest university clinic in one of the most crowded and athletepopulated cities of Turkey, Istanbul. MATERIALS AND METHODS: THE study population comprised 1302 athletes who presented to the sports medicine clinic between the dates of July 1st, 2014, and June 30th, 2015...
February 22, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28229573/associations-between-functional-movement-screen-scores-and-performance-variables-in-surf-athletes
#20
Bruno A Ferreira da Silva, Filipe M Clemente, Fernando M Lourenço Martins
BACKGRAUND: Functional Movement Screen (FMS) have been used to assess the movement patterns in daily sports practice. Some associations between FMS scores and physical variables have been found in some sports. Nevertheless, no study was conducted in surf. METHODS: Eighteen surf athletes (11 male) participated in the study (18.3 ± 6.3 y; 60.0 ± 9.6 kg; 168.6 ± 8.1 cm). All participants completed anthropometrics, Knee to Wall test, Functional Movement Screen, Isometric Knee Extension, Handgrip, Squat and Countermovement Jump...
February 22, 2017: Journal of Sports Medicine and Physical Fitness
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