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International Journal of Sports Medicine

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https://www.readbyqxmd.com/read/29986346/accelerometry-derived-relative-exercise-intensities-in-elite-women-s-basketball
#1
Craig Staunton, Daniel Wundersitz, Brett Gordon, Michael Kingsley
This study assessed accelerometry-derived relative exercise intensity during elite women's basketball match play. The influence of player position/role and match period on relative exercise intensities was evaluated. Ten basketballers wore accelerometers during a Yo-Yo intermittent recovery test (Yo-Yo-IR1) and 18 competitive matches. Relative exercise intensity was quantified using predicted oxygen consumption reserve determined using correlations from Yo-Yo-IR1. Total time, bout frequency and bout duration were calculated in seven intensity zones and compared between quarters, positions (back-court vs...
July 9, 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29945272/effects-of-modified-pyramid-system-on-muscular-strength-and-hypertrophy-in-older-women
#2
Leandro Dos Santos, Alex S Ribeiro, Edilaine F Cavalcante, Hellen C Nabuco, Melissa Antunes, Brad J Schoenfeld, Edilson S Cyrino
This study aimed to analyze the effects of a pyramid system performed with two repetition zones on muscular strength and skeletal muscle mass (SMM) in older women. Thirty-nine physically independent older women (67.8±5.4 years) were randomly assigned into one of two of groups that performed an 8-week resistance training program in an ascending pyramid fashion. Both groups performed 3 sets: a narrow repetition zone (NPR, n=20) with 12/10/8 repetitions, and a wide repetition zone (WPR, n=19) with 15/10/5 repetitions...
June 26, 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29945271/training-performed-above-lactate-threshold-decreases-p53-and-shelterin-expression-in-mice
#3
Verusca Najara de Carvalho Cunha, Thiago Dos Santos Rosa, Marcelo Magalhães Sales, Caio Victor Sousa, Samuel da Silva Aguiar, Lysleine Alves Deus, Herbert Gustavo Simoes, Rosangela Vieira de Andrade
Telomere shortening is associated to sarcopenia leading to functional impairment during aging. There are mechanisms associated with telomere attrition, as well to its protection and repair. Physical training is a factor that attenuates telomere shortening, but little is known about the effects of different exercise intensities on telomere biology. Thus, we evaluated the effects of exercise intensity (moderate vs. high-intensity domain) on gene expression of senescence markers Checkpoint kinase 2 and tumor suppressor ( Chk2 and p53 , respectively), shelterin telomere repeat binding 1 and 2 ( Trf1 / Trf2 ), DNA repair ( Xrcc5 ), telomerase reverse transcriptase ( mTERT ) and telomere length in middle aged mice...
June 26, 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29940671/influence-of-the-lower-body-on-seated-arm-cranking-performance
#4
Ashley L VanSumeren, Thomas K Bye, Matthew A Kilgas, Matthew M Hartvigsen, Steven J Elmer
During upper-body tasks, use of the lower body is important for minimizing physiological strain and maximizing performance. The lower body has an integral role during standing upper-body tasks, however, it is less clear if it is also important during seated upper-body tasks. We determined the extent to which the lower body influenced seated arm cranking performance. Eleven males performed incremental (40+20 W·3 min-1 ) and short-duration maximal effort (5 s, 120 rpm) arm cranking trials with and without lower-body restriction...
June 25, 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29940670/exercise-training-plus-sildenafil-treatment-role-on-autonomic-and-inflammatory-markers
#5
Luis Antonio B Leoni, Andre R Fukushima, Leandro Y Rocha, Daniele J Feriani, Hélio José Coelho Júnior, Bruno B Gambassi, Cristiano T Mostarda, Laura Beatriz Mesiano Maifrino, Bruno Rodrigues
The current study aimed to determine the effects of sildenafil-associated aerobic exercise training (ET) on the physical performance, hemodynamic, autonomic and inflammatory parameters of rats. Male Wistar rats were randomly assigned to: sedentary rats placebo-treated (SP); sedentary rats sildenafil-treated (SS); trained rats placebo-treated (TP); and trained rats sildenafil-treated (TS). Sildenafil treatment consisted of 8 weeks of daily oral gavage (1.5 mg/kg), one hour before the session of ET (60-75% of maximal running speed, 5 days/week, for 8 weeks)...
June 25, 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29940669/short-term-dehydroepiandrosterone-intake-and-supramaximal-exercise-in-young-recreationally-trained-women
#6
Nicolas Gravisse, Nancy Vibarel-Rebot, Zakaria Labsy, Manh-Cuong Do, Olivier Gagey, Céline Dubourg, Michel Audran, Katia Collomp
WADA has banned dehydroepiandrosterone (DHEA) but its ergogenic effect in female athletes has never been investigated. The aim of this study was to determine whether short-term DHEA intake would improve performance during a supramaximal field exercise in healthy young recreationally trained women. Its impact on body composition, metabolic responses was also measured. Eleven young female volunteers completed four running-based anaerobic sprint tests: just before and after treatment with either oral placebo or DHEA (100 mg/day/28days), following a double-blind and randomized protocol...
June 25, 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29940668/eccentric-overload-muscle-damage-is-attenuated-by-a-novel-angiotensin-1-7-treatment
#7
Lenice Kappes Becker, Nádia Totou, Samara Moura, Lucas Kangussu, Ruben Dario Sinisterra Millán, Maria Jose Campagnole-Santos, Daniel Coelho, Daisy Motta-Santos, Robson Augusto Souza Santos
The development of new strategies to attenuate exercise-induced muscle damage may be helpful for training regimens. The aim of this study was to determine whether a oral formulation of angiotensin Ang-(1-7)[HPβCD/Ang-(1-7)] is effective to reduce pain, and muscle damage markers after eccentric-overload exercise. HPβCD (Placebo) and HPβCD/Ang-(1-7) (Ang-(1-7) group were treated for 7 days (one capsule/day). The pain was measured by visual analogue scale, maximal strength (MS) using force platform. Blood samples were collected for cytokines and creatine kinase (CK) analysis...
June 25, 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29940667/incidence-of-achilles-and-patellar-tendinopathy-in-adolescent-elite-athletes
#8
Michael Cassel, Lucie Risch, Konstantina Intziegianni, Juliane Mueller, Josefine Stoll, Pia Brecht, Frank Mayer
The study investigated the incidence of Achilles and patellar tendinopathy in adolescent elite athletes and non-athletic controls. Furthermore, predictive and associated factors for tendinopathy development were analyzed. The prospective study consisted of two measurement days (M1/M2) with an interval of 3.2±0.9 years. 157 athletes (12.1±0.7 years) and 25 controls (13.3±0.6 years) without Achilles/patellar tendinopathy were included at M1. Clinical and ultrasound examinations of both Achilles (AT) and patellar tendons (PT) were performed...
June 25, 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29940666/immune-and-inflammatory-response-in-atopic-elite-endurance-athletes
#9
Renata Nakata Teixeira, Gerson Dos Santos Leite, Renata Gorjao, Patricia Palmeira, Cesar Miguel Momesso Santos, Raquel Zambonatto, Heloisa Helena de Oliveira, Adriana Cristina Levada, Iara Nely Fiks, Celso Ricardo Fernandes Carvalho
The present study aimed to compare the immune and inflammatory responses between atopic (n=20) and non-atopic (n=39) elite endurance athletes. Fifty-nine elite runners and triathletes were assessed for the following measurements: Th1 , Th2 and lymphocyte phenotyping and plasma levels of cortisol, chemokines, inflammatory cytokines and specific immunoglobulin E (IgE). Levels of salivary IgA, allergic symptoms and training data were also evaluated. No difference was observed in baseline lymphocyte levels. However, the Th1 lymphocytes of atopic athletes presented a lower response after activation...
June 25, 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29929204/sport-participation-and-metabolic-risk-during-adolescent-years-a-structured-equation-model
#10
AndréOliveira Werneck, Danilo Rodrigues Pereira da Silva, Rômulo Araújo Fernandes, EnioRicardoVaz Ronque, Manuel J Coelho-E-Silva, Edilson Serpeloni Cyrino
Sports practice during childhood can influence health indicators in later ages through direct and indirect pathways. Thus, this study aimed to test direct and indirect pathways to the association between sports practice in childhood and metabolic risk in adolescence, adopting physical activity, adiposity, and cardiorespiratory fitness at adolescence as potential mediators. This cross-sectional study with retrospective information was conducted with 991 adolescents (579 girls, 412 boys) aged 10 to 16 y. Sports activity was self-reported in childhood (retrospective data) and physical activity evaluated in adolescence through questionnaires...
June 21, 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29929203/a-history-of-concussion-does-not-lead-to-an-increase-in-ocular-near-point-of-convergence
#11
Paul van Donkelaar, Jill Dierijck, Alexander Wright, Jonathan Smirl
Ocular near point of convergence (NPC) has been shown to be sensitive to the effects of concussion and subconcussive impacts. To determine if NPC is also sensitive to a previous history of concussion, male contact-sport athletes either with (n=26) or without (n=16) a history of at least one previous concussion had their NPC assessed. The results showed that participants with a history of concussion displayed NPC values (9.4±1.6 cm) indistinguishable from those with no history of concussion (8.4±2.1 cm, t-test, p=0...
June 21, 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29925107/high-intensity-interval-training-in-different-exercise-modes-lessons-from-time-to-exhaustion
#12
Ana Catarina Sousa, Ricardo J Fernandes, Joao Paulo Vilas Boas, Pedro Figueiredo
To provide information for high-intensity interval training (HIIT) load, we compared the temporal variables of VO2 response at, and after, a time sustained at the exercise intensity corresponding to VO2max (Tlim) in different exercise modes. Forty-five trained male swimmers (11), rowers (13), runners (10) and cyclists (11) completed an incremental protocol to determine the velocity (vVO2max ) or power (wVO2max ) at VO2max and a square wave exercise from rest to 100% of vVO2max /wVO2max . The temporal variables of VO2 response were examined using a breath-by-breath gas analyzer...
June 20, 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29925106/the-effect-of-increasing-jump-steps-on-stance-leg-joint-kinetics-in-bounding
#13
Yasushi Kariyama, Hiroaki Hobara, Koji Zushi
Jump distance per step in bounding exercises from the standing position increases with increasing number of steps. We examined the hypothesis that the joint kinetic variables of the stance leg would also increase accordingly. Eleven male athletes (sprinters and jumpers) performed bounding exercise, starting from the double-leg standing posture, and covered the longest distance possible by performing a series of seven forward alternating single-leg jumps. Kinematic and kinetic data were calculated using the data by a motion capture system and force platforms...
June 20, 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29925105/developmental-changes-in-isometric-strength-longitudinal-study-in-adolescent-soccer-players
#14
Joao P Duarte, João Valente-Dos-Santos, Manuel J Coelho-E-Silva, R M Malina, Dieter Deprez, Renaat Philippaerts, Matthieu Lenoir, Roel Vaeyens
This study aimed to examine longitudinal changes in isometric strength of the knee extensors (ImKE) and knee flexors (ImKF) at 30° and 60°. The sample was composed of 67 players aged 11.0-13.9 years at baseline over five years. Stature, body mass, skinfolds, and isometric strength (ImKE30°, ImKF30°, ImKE60° and ImKF60°) were measured. Fat mass and fat-free mass (FFM) were derived from skinfolds. Skeletal age was obtained using TW2 RUS. Multilevel random effects regression analyses extracted developmental polynomial models...
June 20, 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29906813/correction-functional-threshold-power-in-cyclists-validity-of-the-concept-and-physiological-responses
#15
Fernando Klitzke Borszcz, Artur Ferreira Tramontin, Arthur Henrique Bossi, Lorival José Carminatti, Vitor Pereira Costa
No abstract text is available yet for this article.
June 15, 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29902811/influence-of-training-load-and-altitude-on-hrv-fatigue-patterns-in-elite-nordic-skiers
#16
Laurent Schmitt, Jacques Regnard, Nicolas Coulmy, Gregoire P Millet
We aimed to analyse the relationship between training load/intensity and different heart rate variability (HRV) fatigue patterns in 57 elite Nordic-skiers. 1063 HRV tests were performed during 5 years. R-R intervals were recorded in resting supine (SU) and standing (ST) positions. Heart rate, low (LF), high (HF) frequency powers of HRV were determined. Training volume, training load (TL, a.u.) according to ventilatory threshold 1 (VT1) and VT2 were measured in zones I≤VT1; VT1<II≤VT2; III>VT2, IV for strength...
June 14, 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29902810/the-construct-validity-of-the-coda-and-repeated-sprint-ability-tests-in-football-referees
#17
Amund Riiser, Vidar Andersen, Carlo Castagna, Svein Arne Pettersen, Atle Saeterbakken, Christian Froyd, Einar Ylvisaker, Terje Naess Kjosnes, Vegard Fusche Moe
As of 2017, the international football federation introduced the change of direction ability test (CODA) and the 5×30 m sprint test for assistant referees (ARs) and continued the 6×40 m sprint test for field referees (FRs) as mandatory tests. The aim of this study was to evaluate the association between performance in these tests and running performance during matches at the top level in Norway. The study included 9 FRs refereeing 21 matches and 19 ARs observed 53 times by a local positioning system at three stadiums during the 2016 season...
June 14, 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29902806/effect-of-physical-exercise-on-platelet-reactivity-in-patients-with-dual-antiplatelet-therapy
#18
Stefan Brunner, Konstantinos Rizas, Wolfgang Hamm, Michael Mehr, Korbinian Lackermair
It is known that physical exercise may increase platelet activity. However, the effect of exercise on platelet reactivity in patients on dual antiplatelet therapy has not been investigated yet. In our study, 21 patients with coronary artery disease on dual antiplatelet therapy and 10 controls were enrolled. We performed an exercise test using a cycle ergometer and determined the adenosine diphosphate-induced platelet reactivity before and immediately after exercise testing. Additionally, we analysed maximal exercise capacity and an electrocardiogram...
June 14, 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29801189/functional-threshold-power-in-cyclists-validity-of-the-concept-and-physiological-responses
#19
Fernando Klitzke Borszcz, Artur Ferreira Tramontin, Arthur Henrique Bossi, Lorival José Carminatti, Vitor Pereira Costa
Functional threshold power is defined as the highest power output a cyclist can maintain in a quasi-steady state for approximately 60 min (FTP60 ). In order to improve practicality for regular evaluations, FTP60 could theoretically be determined as 95% of the mean power output in a 20-min time trial (FTP20 ). This study tested this assumption and the validity of FTP20 and FTP60 against the individual anaerobic threshold (IAT). Twenty-three trained male cyclists performed an incremental test to exhaustion, 20- and 60-min time trials, and a time to exhaustion at FTP20 ...
May 25, 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29775986/effects-of-two-training-programs-on-transcriptional-levels-of-neurotrophins-and-glial-cells-population-in-hippocampus-of-experimental-multiple-sclerosis
#20
Maryam Naghibzadeh, Rouhollah Ranjbar, Mohammad Reza Tabandeh, Abdolhamid Habibi
The aim of the present study was to investigate the effects of high-intensity interval training (HIIT) versus low-intensity continuous training (LICT) on transcriptional levels of neurotrophic factors and oligodendrocyte/microglia cell loss in a cuprizone (CP) induced animal model of demyelination. Male C57BL/6 mice were assigned to six groups: control (C), cuprizone-induced demyelination (CP), interval training (IT), continuous training (CT), IT plus CP (ITCP), and CT plus CP (CTCP). Training programs on the treadmill were performed for four weeks, and then demyelination was induced by feeding mice a diet containing 0...
May 18, 2018: International Journal of Sports Medicine
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