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https://www.readbyqxmd.com/read/29161094/the-effect-of-resistance-training-in-a-hypoxic-chamber-on-physical-performance-in-elite-rugby-athletes
#1
Brad Mayo, Cory Miles, Stacy Sims, Matthew Driller
Mayo, Brad, Cory Miles, Stacy Sims, and Matthew Driller. The effect of resistance training in a hypoxic chamber on physical performance in elite rugby athletes. High Alt Med Biol 00:000-000, 2017.-Limited research suggests that muscle adaptations may be enhanced through resistance training in a hypoxic environment. Seventeen professional rugby union athletes (age [mean ± SD], 24 ± 3 years; body mass, 98.7 ± 12.8 kg; and height, 188.9 ± 7.9 cm), performed 12 resistance training sessions over a 3-week period...
November 21, 2017: High Altitude Medicine & Biology
https://www.readbyqxmd.com/read/29160140/the-effects-of-weighted-skates-on-ice-skating-kinematics-kinetics-and-muscular-activity
#2
Matthew P Mavor, Dean C Hay, Ryan B Graham
Sport-specific resistance training, through limb loading, can be a complimentary training method to traditional resistance training by loading the working muscles during all phases of a specific movement. The purpose of this study was to examine the acute effects of skating with an additional load on the skate, using a skate weight prototype, on kinematics, kinetics, and muscle activation during the acceleration phase while skating on a synthetic ice surface. 10 male hockey skaters accelerated from rest (standing erect with knees slightly bent) under four non-randomized load conditions: baseline 1 (no weight), light (0...
November 21, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29140909/the-effects-of-load-on-peak-power-output-fatigue-during-the-bench-throw
#3
David Boffey, Bulent Sokmen, Kurt Sollanek, Wanda Boda, Steven Winter
The ability to create power is an important variable for athletic success. No study to date has compared peak power output (PPO) fatigue across multiple sets and with different loads with the bench throw. This study aimed to begin the process of establishing empirical upper body power training guidelines for moderately strong athletes by determining how load (30%, 45%, 60% 1RM) affects PPO (Watts) dropoff during 3 sets of 10 repetitions of the bench throw. 10 resistance-trained male volunteers ((mean ± SD): age 20...
November 14, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29140431/microvascular-adaptations-to-exercise-protective-effect-of-pgc-1-alpha
#4
Andrew O Kadlec, Chad Barnes, Matthew J Durand, David D Gutterman
BACKGROUND: Sedentary behavior and obesity are major risk factors for cardiovascular disease. Regular physical activity has independent protective effects on the cardiovascular system, but the mechanisms responsible remain elusive. Recent studies suggest that the protein peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC-1α) participates in the response to exercise training. We hypothesized that the arterioles of athletes maintain dilation to flow despite combined inhibition of multiple vasodilators, but loss of PGC-1α renders these vessels susceptible to inhibition of a single vasodilator pathway...
November 11, 2017: American Journal of Hypertension
https://www.readbyqxmd.com/read/29127601/interpreting-adaptation-to-concurrent-compared-with-single-mode-exercise-training-some-methodological-considerations
#5
REVIEW
Jackson J Fyfe, Jeremy P Loenneke
Incorporating both endurance and resistance training into an exercise regime is termed concurrent training. While there is evidence that concurrent training can attenuate resistance training-induced improvements in maximal strength and muscle hypertrophy, research findings are often equivocal, with some suggesting short-term concurrent training may instead further enhance muscle hypertrophy versus resistance training alone. These observations have questioned the validity of the purported 'interference effect' on muscle hypertrophy with concurrent versus single-mode resistance training...
November 10, 2017: Sports Medicine
https://www.readbyqxmd.com/read/29110300/dissociation-of-intramyocellular-lipid-storage-and-insulin-resistance-in-trained-athletes-and-type-2-diabetes-patients-involvement-of-perilipin-5
#6
Anne Gemmink, Sabine Daemen, Bram Brouwers, Peter R Huntjens, Gert Schaart, Esther Moonen-Kornips, Johanna Jörgensen, Joris Hoeks, Patrick Schrauwen, Matthijs K C Hesselink
Intramyocellular lipids (IMCL) hamper insulin sensitivity albeit not in endurance-trained athletes (Trained). Compared to type 2 diabetes patients (T2DM), Trained subjects have high levels of Perilipin 5 (PLIN5). Here, we tested if the fraction of PLIN5 coated LDs is a determinant of skeletal muscle insulin sensitivity and contributes to the athlete's paradox. Muscle biopsies were taken from 8 Trained, Lean sedentary, Obese and T2DM subjects. Trained, Obese and T2DM subjects were matched for total IMCL content...
November 7, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/29091016/a-critical-review-of-the-current-evidence-examining-whether-resistance-training-improves-time-trial-performance
#7
Scott J Dankel, Kevin T Mattocks, J Grant Mouser, Samuel L Buckner, Matthew B Jessee, Jeremy P Loenneke
A number of reviews have concluded that resistance training is beneficial for improving sports performance despite the inclusion of studies which do not actually measure a performance outcome (i.e. a timed trial). The purpose of this review was to examine only those studies which would allow us to infer the benefits of resistance training on improving time trial performance. Of the nine studies meeting all inclusion criteria only three demonstrated an additive effect of adding resistance training to the current activity-specific training being performed...
November 1, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29089292/tapering-practices-of-strongman-athletes-test-retest-reliability-study
#8
Paul W Winwood, Hayden J Pritchard, Justin Wl Keogh
BACKGROUND: Little is currently known about the tapering practices of strongman athletes. We have developed an Internet-based comprehensive self-report questionnaire examining the training and tapering practices of strongman athletes. OBJECTIVE: The objective of this study was to document the test-retest reliability of questions associated with the Internet-based comprehensive self-report questionnaire on the tapering practices of strongman athletes. The information will provide insight on the reliability and usefulness of the online questionnaire for use with strongman athletes...
October 31, 2017: JMIR Research Protocols
https://www.readbyqxmd.com/read/29059531/creatine-use-in-sports
#9
Jessica Butts, Bret Jacobs, Matthew Silvis
CONTEXT: The use of creatine as a dietary supplement has become increasingly popular over the past several decades. Despite the popularity of creatine, questions remain with regard to dosing, effects on sports performance, and safety. EVIDENCE ACQUISITION: PubMed was searched for articles published between 1980 and January 2017 using the terms creatine, creatine supplementation, sports performance, and dietary supplements. An additional Google search was performed to capture National Collegiate Athletic Association-specific creatine usage data and US dietary supplement and creatine sales...
October 1, 2017: Sports Health
https://www.readbyqxmd.com/read/29023328/strength-and-conditioning-habits-of-competitive-distance-runners
#10
Richard C Blagrove, Nicola Brown, Glyn Howatson, Philip R Hayes
Blagrove, RC, Brown, N, Howatson, G, and Hayes, PR. Strength and conditioning habits of competitive distance runners. J Strength Cond Res XX(X): 000-000, 2017-Targeted strength and conditioning (S&C) programs can potentially improve performance and reduce injury risk factors in competitive runners. However, S&C practices of distance runners are unknown. This study aimed to explore S&C practices of competitive middle- and long-distance runners and examined whether reported frequency of injuries was influenced by training behaviors...
October 10, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29017017/the-effect-of-resistance-training-set-configuration-on-strength-power-and-hormonal-adaptation-in-female-volleyball-players
#11
Hamid Arazi, Aida Khanmohammadi, Abbas Asadi, G Gregory Haff
The primary purpose of this investigation was to determine the impact of altering the set structure during an 8-week resistance training program on anthropometric, hormonal, and strength power characteristics. Thirty female volleyball players were recruited for participation and then randomly assigned to one of three resistance training groups: 1) cluster sets (CRT; n=10), 2) traditional sets (TRT: n=10), or 3) control (CON: n=10). All athletes were evaluated for thigh and arm circumference, vertical jump (VJ), 20-m sprint, 4x9-m shuttle-run, 1 repetition maximum (1RM) back squat, bench press, military press, and deadlift prior to and after an 8-week periodized training intervention...
October 10, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29016476/effects-of-in-season-circuit-training-on-physical-abilities-in-male-handball-players
#12
Souhail Hermassi, Rainer Wollny, René Schwesig, Roy J Shephard, Mohamed Souhaiel Chelly
This study analyzed the effects of a resistance-type circuit training program (RCT) (30-35 minutes, performed twice a week for 10 weeks) on male handball players. Twenty-two males were divided into experimental (E; age 20.3 ± 0.5 years) and control groups (C; age 20.1± 0.5 years). Measures before and after RCT included squat (SJ) and countermovement jumps (CMJ), one repetition maximum (1-RM) ofbench press, pull-over and back half-squats, throwing velocity (a 3-step throw with run (RT), and a jump throw (JT)), repeated-sprint ability (six 2 x 15-m shuttle sprints with recording of best time for a single trial), anthropometric estimates of leg and thigh muscle volumes and mean thigh cross-sectional area (CSA), and a test of agility...
October 7, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28993146/exercise-training-reverses-the-negative-effects-of-chronic-l-arginine-supplementation-on-insulin-sensitivity
#13
Rafael Barrera Salgueiro, Frederico Gerlinger-Romero, Lucas Guimarães-Ferreira, Thais de Castro Barbosa, Maria Tereza Nunes
L-Arginine has emerged as an important supplement for athletes and non-athletes in order to improve performance. Arginine has been extensively used as substrate for nitric oxide synthesis, leading to increased vasodilatation and hormonal secretion. However, the chronic consumption of arginine has been shown to impair insulin sensitivity. In the present study, we aimed to evaluate whether chronic arginine supplementation associated with exercise training would have a beneficial impact on insulin sensitivity...
October 6, 2017: Life Sciences
https://www.readbyqxmd.com/read/28990148/athletes-and-the-aorta-normal-adaptations-and-the-diagnosis-and-management-of-pathology
#14
REVIEW
J Stephen Hedley, Dermot Phelan
Over a hundred years ago, physicians first recognized that participation in regular, vigorous training resulted in enlargement of the heart. Since that time, the term "athlete's heart" has entered the medical lexicon as a global expression encompassing the electrical, functional, and morphological adaptations that develop in response to physical training. Exercise-induced adaptations of the aorta, which is also exposed to large hemodynamic stresses during prolonged endurance exercise or resistance training, are less well recognized...
October 9, 2017: Current Treatment Options in Cardiovascular Medicine
https://www.readbyqxmd.com/read/28978544/intramuscular-triglyceride-synthesis-importance-in-partitioning-muscle-lipids-in-humans
#15
Bryan C Bergman, Leigh Perreault, Allison Strauss, Samantha D Bacon, Anna A Kerege, Kathleen Harrison, Joseph T Brozinick, Devon M Hunerdosse, Mary C Playdon, William Holmes, Hai Hoang Bui, Phil Sanders, Parker Siddall, Tao Wei, Melissa K Thomas, Ming Shang Kuo, Robert H Eckel
Intramuscular triglyceride (IMTG) concentration is elevated in insulin resistant individuals, and was once thought to promote insulin resistance. However, endurance trained athletes have equivalent concentration of IMTG compared to individuals with type 2 diabetes, and have very low risk of diabetes, termed the "athlete's paradox". We now know that IMTG synthesis is positively related to insulin sensitivity, but the exact mechanisms for this are unclear. To understand the relationship between IMTG synthesis and insulin sensitivity, we measured IMTG synthesis in obese control subjects, endurance trained athletes, and individuals with type 2 diabetes during rest, exercise, and recovery...
October 3, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28965198/time-course-of-recovery-following-resistance-training-leading-or-not-to-failure
#16
Ricardo Morán-Navarro, Carlos E Pérez, Ricardo Mora-Rodríguez, Ernesto de la Cruz-Sánchez, Juan José González-Badillo, Luis Sánchez-Medina, Jesús G Pallarés
PURPOSE: To describe the acute and delayed time course of recovery following resistance training (RT) protocols differing in the number of repetitions (R) performed in each set (S) out of the maximum possible number (P). METHODS: Ten resistance-trained men undertook three RT protocols [S × R(P)]: (1) 3 × 5(10), (2) 6 × 5(10), and (3) 3 × 10(10) in the bench press (BP) and full squat (SQ) exercises. Selected mechanical and biochemical variables were assessed at seven time points (from - 12 h to + 72 h post-exercise)...
December 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28952896/gastrointestinal-prophylaxis-in-sports-medicine
#17
Akash R Patel, Daniel Oheb, Tracy L Zaslow
CONTEXT: Because sports participation at all levels often requires international travel, coaches, athletic trainers, and team physicians must effectively protect athletes from gastrointestinal infections. Traveler's diarrhea is the most common travel-related illness and can significantly interfere with training and performance. EVIDENCE ACQUISITION: A review of relevant publications was completed using PubMed and Google Scholar. STUDY DESIGN: Clinical review...
September 1, 2017: Sports Health
https://www.readbyqxmd.com/read/28933713/adaptations-associated-with-an-after-school-strength-and-conditioning-program-in-middle-school-aged-boys-a-quasi-experimental-design
#18
Brennan J Thompson, Matt S Stock, Jacob A Mota, Alexander S Drusch, Ryan N DeFranco, Tyler R Cook, Matthew A Hamm
High-intensity strength and conditioning programs aimed at improving youth performance are becoming increasingly prevalent. The purpose of this study was to investigate the effects of a 16-week after-school strength and conditioning program on performance and body composition in middle-school-aged boys. Subjects in the training group (n = 16, mean age = 11.8 years) performed 90 minutes of supervised plyometric and resistance training twice weekly for 16 weeks. A group of control subjects (n = 9, age = 12.1 years) maintained their current activity levels...
October 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28933024/effects-of-rest-interval-duration-in-resistance-training-on-measures-of-muscular-strength-a-systematic-review
#19
REVIEW
Jozo Grgic, Brad J Schoenfeld, Mislav Skrepnik, Timothy B Davies, Pavle Mikulic
BACKGROUND: Rest interval (RI) duration is an important resistance-training variable underlying gain in muscular strength. Recommendations for optimal RI duration for gains in muscular strength are largely inferred from studies examining the acute resistance training effects, and the generalizability of such findings to chronic adaptations is uncertain. OBJECTIVE: The goals of this systematic literature review are: (i) to aggregate findings and interpret the studies that assessed chronic muscular strength adaptations to resistance training interventions involving different RI durations, and (ii) to provide evidence-based recommendations for exercise practitioners and athletes...
September 20, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28922211/acute-effects-of-ammonia-inhalants-on-strength-and-power-performance-in-trained-men
#20
Sandro Bartolomei, Federico Nigro, Gubellini Luca, Semprini Gabriele, Simone Ciacci, Jay R Hoffman, Franco Merni
The aim of the present study was to investigate the influence of ammonia inhalants on lower body power and maximal isometric strength in trained men. Twenty experienced resistance trained men (age = 26.7 ± 3.7 y; body weight = 80.59 ± 9.0 kg; body height = 179.5 ± 5.7 cm) were tested for counter movement jump power (CMJP), maximal force and rate of force development (pRFD20) expressed during an isometric mid-thigh pull (IMTP). Assessments were performed using either an ammonia salt inhalants (AI), a placebo (PL) or no inhalants (N)...
September 12, 2017: Journal of Strength and Conditioning Research
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