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Periodization endurance

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https://www.readbyqxmd.com/read/28338358/a-mismatch-between-athlete-practice-and-current-sports-nutrition-guidelines-among-elite-female-and-male-middle-and-long-distance-athletes
#1
Ida Aliisa Heikura, Trent Stellingwerff, Antti A Mero, Arja Leena Tuulia Uusitalo, Louise Mary Burke
Contemporary nutrition guidelines promote a variety of periodized and time-sensitive recommendations, but current information regarding the knowledge and practice of these strategies among world-class athletes is limited. The aim of this study was to investigate this theme by implementing a questionnaire on dietary periodization practices in national/international level female (n=27) and male (n=21) middle- and long-distance runners/race-walkers. The questionnaire aimed to gain information on between and within-day dietary choices, as well as timing of pre- and post-training meals and practices of training with low or high carbohydrate (CHO) availability...
March 24, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28335426/elevated-serum-hepcidin-levels-during-an-intensified-training-period-in-well-trained-female-long-distance-runners
#2
Aya Ishibashi, Naho Maeda, Daichi Sumi, Kazushige Goto
Iron is essential for providing oxygen to working muscles during exercise, and iron deficiency leads to decreased exercise capacity during endurance events. However, the mechanism of iron deficiency among endurance athletes remains unclear. In this study, we compared iron status between two periods involving different training regimens. Sixteen female long-distance runners participated. Over a seven-month period, fasting blood samples were collected during their regular training period (LOW; middle of February) and during an intensified training period (INT; late of August) to determine blood hematological, iron, and inflammatory parameters...
March 14, 2017: Nutrients
https://www.readbyqxmd.com/read/28329224/a-clinically-relevant-frailty-index-for-aging-rats
#3
Marshall G Miller, Nopporn Thangthaeng, Barbara Shukitt-Hale
Frailty is a clinical syndrome that is increasingly prevalent during aging. Frailty involves the confluence of reduced strength, speed, physical activity, and endurance and is associated with adverse health outcomes. The present study adapts existing clinical and preclinical indices of frailty to the Fischer (F344) rat. Male F344 rats (n = 133; 17 mo) completed a battery of behavioral tasks, including forelimb wire suspension (strength), rotarod (speed), open field (physical activity), and inclined screen (endurance)...
January 21, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/28325109/feasibility-and-effects-of-a-combined-adjuvant-high-intensity-interval-strength-training-in-breast-cancer-patients-a-single-center-pilot-study
#4
Sebastian Viktor Waldemar Schulz, Roman Laszlo, Stephanie Otto, Dmytro Prokopchuk, Uwe Schumann, Florian Ebner, Jens Huober, Jürgen Michael Steinacker
PURPOSE: To evaluate feasibility of an exercise intervention consisting of high-intensity interval endurance and strength training in breast cancer patients. METHODS: Twenty-six women with nonmetastatic breast cancer were consecutively assigned to the exercise intervention- (n= 15, mean age 51.9 ± 9.8 years) and the control group (n = 11, mean age 56.9 ± 7.0 years). Cardiopulmonary exercise testing that included lactate sampling, one-repetition maximum tests and a HADS-D questionnaire were used to monitor patients both before and after a supervised six weeks period of either combined high-intensity interval endurance and strength training (intervention group, twice a week) or leisure training (control group)...
March 21, 2017: Disability and Rehabilitation
https://www.readbyqxmd.com/read/28323305/exercise-to-reduce-work-related-fatigue-among-employees-a-randomized-controlled-trial
#5
Juriena D de Vries, Madelon Lm van Hooff, Sabine Ae Guerts, Michiel Aj Kompier
Objectives The present study evaluated the efficacy of an exercise intervention to reduce work-related fatigue (emotional exhaustion, overall fatigue, and need for recovery). The effects of exercise on self-efficacy, sleep, work ability, cognitive functioning and aerobic fitness (secondary outcomes) were also investigated. Methods Employees with high levels of work-related fatigue were randomly assigned to either a 6-week exercise intervention (EI; N=49) or a wait-list control group (WLC; N=47). All participants were measured pre- (T0) and post-intervention (T1)...
March 21, 2017: Scandinavian Journal of Work, Environment & Health
https://www.readbyqxmd.com/read/28323240/the-impact-of-continuous-use-of-lumbosacral-orthoses-on-trunk-motor-performance-a-systematic-review-with-meta-analysis
#6
REVIEW
Hiroshi Takasaki, Takahiro Miki
BACKGROUND CONTEXT: The lumbosacral orthosis (LSO) is prescribed by general practitioners for the management of low back pain. It may be speculated that continuous use of the LSO for a prolonged period reduces mechanical loading to the trunk muscle in daily living and results in impairments of the trunk muscle. PURPOSE: To investigate whether the trunk motor performances are impaired by continuous use of the lumbosacral orthosis. STUDY DESIGN/SETTING: Systematic review with meta-analysis...
March 17, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28316769/etiological-influences-on-the-stability-of-autistic-traits-from-childhood-to-early-adulthood-evidence-from-a-twin-study
#7
Mark J Taylor, Christopher Gillberg, Paul Lichtenstein, Sebastian Lundström
BACKGROUND: Autism spectrum disorders (ASD) are persistent and lifelong conditions. Despite this, almost all twin studies focus on childhood. This twin study investigated the stability of autistic traits from childhood to early adulthood and explored the degree to which any stability could be explained by genetic or environmental factors. METHODS: Parents of over 2500 twin pairs completed questionnaires assessing autistic traits when twins were aged either 9 or 12 years and again when twins were aged 18...
2017: Molecular Autism
https://www.readbyqxmd.com/read/28303944/relationships-between-strength-and-endurance-parameters-and-air-depletion-rates-in-professional-firefighters
#8
Stephanie Windisch, Wolfgang Seiberl, Ansgar Schwirtz, Daniel Hahn
The aim of this study was to quantify the physical demands of a simulated firefighting circuit and to establish the relationship between job performance and endurance and strength fitness measurements. On four separate days 41 professional firefighters (39 ± 9 yr, 179.6 ± 2.3 cm, 84.4 ± 9.2 kg, BMI 26.1 ± 2.8 kg/m(2)) performed treadmill testing, fitness testing (strength, balance and flexibility) and a simulated firefighting exercise. The firefighting exercise included ladder climbing (20 m), treadmill walking (200 m), pulling a wire rope hoist (15 times) and crawling an orientation section (50 m)...
March 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28300461/evaluation-of-serial-casting-for-boys-with-duchenne-muscular-dystrophy-a-case-report
#9
Kate Carroll, Katy de Valle, Andrew Kornberg, Monique Ryan, Rachel Kennedy
AIM: To report the effects of below-knee serial casting in two boys with Duchenne muscular dystrophy who presented with well-preserved strength and calf shortening. METHODS: Bilateral below-knee serial casts were applied over two weeks with follow-up of daily stretching and wearing of customized night splints. Outcome measures were performed at baseline, 1, 3, 6, and 12 months post-casting. These included measures of calf length, leg strength, motor function, endurance, and spatio-temporal gait parameters...
March 16, 2017: Physical & Occupational Therapy in Pediatrics
https://www.readbyqxmd.com/read/28296943/new-approaches-to-determine-fatigue-in-elite-athletes-during-intensified-training-resting-metabolic-rate-and-pacing-profile
#10
Amy L Woods, Laura A Garvican-Lewis, Bronwen Lundy, Anthony J Rice, Kevin G Thompson
BACKGROUND: Elite rowers complete a high volume of training across a number of modalities to prepare for competition, including periods of intensified load, which may lead to fatigue and short-term performance decrements. As yet, the influence of substantial fatigue on resting metabolic rate (RMR) and exercise regulation (pacing), and their subsequent utility as monitoring parameters, has not been explicitly investigated in elite endurance athletes. METHOD: Ten National-level rowers completed a four-week period of intensified training...
2017: PloS One
https://www.readbyqxmd.com/read/28292885/heavy-strength-training-improves-running-and-cycling-performance-following-prolonged-submaximal-work-in-well-trained-female-athletes
#11
Olav Vikmoen, Bent R Rønnestad, Stian Ellefsen, Truls Raastad
The purpose of this study was to investigate the effects of adding heavy strength training to female duathletes' normal endurance training on both cycling and running performance. Nineteen well-trained female duathletes (VO2max cycling: 54 ± 3 ml∙kg(-1)∙min(-1), VO2max running: 53 ± 3 ml∙kg(-1)∙min(-1)) were randomly assigned to either normal endurance training (E, n = 8) or normal endurance training combined with strength training (E+S, n = 11). The strength training consisted of four lower body exercises [3 × 4-10 repetition maximum (RM)] twice a week for 11 weeks...
March 2017: Physiological Reports
https://www.readbyqxmd.com/read/28291479/does-combat-hearing-preservation-equipment-affect-balance
#12
Art Ambrosio, Ali N Hoffer, Michael Hoffer
OBJECTIVES: (1) To investigate whether the occlusion effect and hearing attenuation produced by 3M Combat Arms Ear Plugs (CAEP) affects balance when compared to no hearing protection and (2) to investigate whether the occlusion effect and noise-canceling capabilities of the Nacre QuietPro system affects balance when compared to no hearing protection. METHODS: This prospective study collected pilot data for investigation of mechanisms of balance. 20 subjects with normal hearing and no vestibular dysfunction were tested with blackened goggles in three conditions-no hearing protection, CAEP, and with the Nacre QuietPro...
March 2017: Military Medicine
https://www.readbyqxmd.com/read/28290957/oral-maxillofacial-injury-surveillance-of-u-s-military-personnel-in-iraq-and-afghanistan-2001-to-2014
#13
Timothy A Mitchener, Rodney Chan, John W Simecek
BACKGROUND: Cranial and oral-maxillofacial injuries accounted for 33% of military visits to in-theater (Level III) military treatment facilities for battle injuries during Operation Enduring Freedom (OEF) and Operation Iraqi Freedom (OIF). Even after years of conflict, the size and scope of oral-maxillofacial injuries in military armed conflict is still not fully understood. This study reports U.S. Department of Defense (DoD) rates of oral-maxillofacial injuries that can be used for further surveillance and research...
March 2017: Military Medicine
https://www.readbyqxmd.com/read/28288322/skill-related-physical-fitness-versus-aerobic-fitness-as-a-predictor-of-executive-functioning-in-children-with-intellectual-disabilities-or-borderline-intellectual-functioning
#14
Esther Hartman, Joanne Smith, Suzanne Houwen, Chris Visscher
Children with intellectual disabilities (ID) or borderline intellectual disabilities (BIF) often demonstrate impairments in executive functioning (EF). Studies in typically developing children show that aerobic fitness (AF) is positively related with EF. Skill-related physical fitness (SF) might, however, be a stronger predictor of EF than AF, as cognitive challenges are inherent in application of these skills. In this study, AF and SF were examined simultaneously in relationship with domains of EF in children with ID or BIF...
March 10, 2017: Research in Developmental Disabilities
https://www.readbyqxmd.com/read/28287287/reporting-of-symptoms-associated-with-concussion-by-oef-oif-ond-veterans-comparison-between-research-and-clinical-contexts
#15
Colleen E Jackson, Leslie Nordstrom, Jennifer R Fonda, Catherine B Fortier, William P Milberg, Regina E McGlinchey
OBJECTIVE: Veterans from recent military conflicts frequently report persisting symptoms associated with concussion well beyond the expected period of recovery following mild traumatic brain injury. This study examined differences in the reporting of symptoms associated with concussion between clinical and research contexts. METHODS: This naturalistic comparison included 91 Veterans from Operations Enduring Freedom (OEF), Iraqi Freedom (OIF) and New Dawn (OND). All participants were enrolled in a longitudinal study focused on traumatic brain injury and stress-related disorders and had also completed a VHA Comprehensive TBI Evaluation...
March 13, 2017: Brain Injury: [BI]
https://www.readbyqxmd.com/read/28282741/effects-of-acute-exercise-dehydration-and-rehydration-on-cognitive-function-in-well-trained-athletes
#16
Christopher Irwin, Nadia Campagnolo, Elizaveta Iudakhina, Gregory R Cox, Ben Desbrow
This study investigated the effects of aerobic exercise, fluid loss and rehydration on cognitive performance in well-trained athletes. Ten endurance-trained males (25 ± 5 years; 175 ± 5 cm; 70.35 ± 5.46 kg; VO2max, 62.95 ± 7.20 ml · kg.min(-1)) lost ~2.5 ± 0.6% body mass via continuous cycling exercise at ~65% peak sustainable power output (60 min duration) before consuming different beverages (Water = W1 and W2, Sustagen Sport = SS, Powerade = PD) and food ad libitum on four separate occasions...
March 2, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28282326/effects-of-mental-fatigue-on-endurance-performance-in-the-heat
#17
Jeroen Van Cutsem, Kevin De Pauw, Luk Buyse, Samuele Marcora, Romain Meeusen, Bart Roelands
PURPOSE: Mental fatigue is a psychobiological state caused by prolonged periods of demanding cognitive activity and has been observed to decrease time-trial (TT) endurance performance by ~3,5% in normal ambient temperatures. Recently it has been suggested that heat may augment the negative effect of mental fatigue on cognitive performance, raising the question whether it may also amplify the effect of mental fatigue on TT-performance. METHODS: In 30 °C and 30% relative humidity, ten endurance-trained male athletes (Age: 22 ± 3 y; Wmax: 332 ± 41 W) completed two experimental conditions: intervention (I; 45-min Stroop task) and control (C; 45-min documentary)...
March 9, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28277433/changes-in-unilateral-upper-limb-muscular-strength-and-emg-activity-following-a-16-week-strength-training-intervention-survivors-of-breast-cancer
#18
Amanda D Hagstrom, Kathleen A Shorter, Paul W M Marshall
Upper limb strength deficits are frequently observed following breast cancer and its treatments. It is currently unknown whether these unilateral deficits can be corrected by a standard bilateral strength training intervention. Twenty three survivors of breast cancer were included in this analysis. Fourteen performed a 16 week resistance training (RT) intervention, 9 were assigned to a usual care waitlist control group. Electromyographic (EMG) analysis of the pectoralis major and triceps brachii were monitored during three maximal isometric contractions and a fatiguing endurance task...
March 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28277169/predicted-endurance-times-during-overhead-work-influences-of-duty-cycle-and-tool-mass-estimated-using-perceived-discomfort
#19
Deepti Sood, Maury A Nussbaum, Kris Hager, Helen C Nogueira
A need for overhead work remains in several industries and such work is an important risk factor for shoulder musculoskeletal problems. In this study, we evaluated the effects of duty cycle and tool mass on endurance times during overhead work. A psychophysical approach was used, via a new methodology that was implemented to more efficiently estimate endurance times (rather than through direct measurements). Participants performed a simulated overhead task in specified combinations of tool mass and duty cycle...
February 21, 2017: Ergonomics
https://www.readbyqxmd.com/read/28271312/chronic-effects-of-superimposed-electromyostimulation-during-cycling-on-aerobic-and-anaerobic-capacity
#20
Sebastian Mathes, Niklas Lehnen, Tobias Link, Wilhelm Bloch, Joachim Mester, Patrick Wahl
PURPOSE: To examine if chronic endurance training by means of simultaneously applied, superimposed electromyostimulation (EMS) can be used to improve performance and physiological core parameters compared to the traditional cycling. METHODS: Twenty-one male subjects (VO2peak 55.2 ± 5.1 ml min(- 1) kg(- 1)) were assigned to either a cycling (C) or cycling with superimposed EMS (C + E) group. Before and after the 4-week training period, including 14 sessions of moderate cycling [60 min at 60% peak power output (PPO)], participants performed a 20-min time-trial, a step test to exhaustion, a 30-s isokinetic sprint test, and maximum force- and power-tests...
March 7, 2017: European Journal of Applied Physiology
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