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https://www.readbyqxmd.com/read/29771609/achilles-tendon-structure-differs-between-competitive-distance-runners-and-non-runners-despite-no-clinical-signs-or-symptoms-of-mid-substance-tendinopathy
#1
Todd J Hullfish, Kenton L Hagan, Ellen Casey, Josh R Baxter
Achilles tendinopathy affects many running athletes and often leads to chronic pain and functional deficits. While changes in tendon structure have been linked with tendinopathy, the effects of distance running on tendon structure is not well understood. Therefore, the purpose of this study was to characterize structural differences in the Achilles tendons in healthy young adults and competitive distance runners using quantitative ultrasound analyses. We hypothesized that competitive distance runners with no clinical signs or symptoms of tendinopathy would have quantitative signs of tendon damage, characterized by decreased collagen alignment and echogenicity, in addition to previous reports of thicker tendons...
May 17, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29766694/analysis-of-the-choice-of-food-products-and-the-energy-value-of-diets-of-female-middle-and-long-distance-runners-depending-on-the-self-assessment-of-their-nutritional-habits
#2
Dominika Głąbska, Marta Jusińska
Background: Properly balanced diet is especially important in the case of young athletes, as it influences not only their physical development, but also influences results obtained during trainings and competitions. Objective: The aim of the study was to assess the choice of food products and the energy value of diets of female middleand long-distance runners, depending on the self-assessment of their nutritional habits. Material and methods: The study was conducted in the group of 40 female middle- and long-distance runners, aged 15-25, who declared average diet (n=15, 37...
2018: Roczniki Państwowego Zakładu Higieny
https://www.readbyqxmd.com/read/29761269/effects-of-running-a-marathon-on-irisin-concentration-in-men-aged-over-50
#3
Paweł Jóźków, Dawid Koźlenia, Katarzyna Zawadzka, Marek Konefał, Paweł Chmura, Katarzyna Młynarska, Michał Kosowski, Marek Mędraś, Jan Chmura, Piotr Ponikowski, Jacek Daroszewski
Our aim was to verify whether running a marathon is associated with changes in irisin concentration in healthy, endurance-trained men. In an observational study, we assessed baseline biochemical and fitness parameters of 28 middle-aged runners (mean ± SD age, BMI, VO2max : 58 ± 8 years; 24.5 ± 3 kg/m2 ; 51.1 ± 1.7 ml/kg/min). We evaluated irisin before, immediately after, and 7 days after the marathon. Irisin concentration decreased from a baseline value of 639 ± 427 to 461 ± 255 ng/ml immediately after the marathon (p < 0...
May 14, 2018: Journal of Physiological Sciences: JPS
https://www.readbyqxmd.com/read/29731746/response-of-gut-microbiota-to-metabolite-changes-induced-by-endurance-exercise
#4
Xia Zhao, Zhujun Zhang, Bin Hu, Wei Huang, Chao Yuan, Lingyun Zou
A few animal studies have shown that wheel running could reverse an unhealthy status by shifting the gut microbial composition, but no investigations have studied the effect of endurance running, such as marathon running, on human gut microbial communities. Since many findings have shown that marathon running immediately causes metabolic changes in blood, urine, muscles and lymph that potentially impact the gut microbiota (GM) within several hours. Here, we investigated whether the GM immediately responds to the enteric changes in amateur half-marathon runners...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29729546/risk-models-for-lower-extremity-injuries-among-short-and-long-distance-runners-a-prospective-cohort-study
#5
Dennis van Poppel, Gwendolijne G M Scholten-Peeters, Marienke van Middelkoop, Bart W Koes, Arianne P Verhagen
BACKGROUND: Running injuries are very common. Risk factors for running injuries are not consistently described across studies and do not differentiate between runners of long- and short distances within one cohort. OBJECTIVES: The aim of this study is to determine risk factors for running injuries in recreational long- and short distance runners separately. DESIGN: A prospective cohort study. METHODS: Recreational runners from four different running events are invited to participate...
April 28, 2018: Musculoskeletal Science & Practice
https://www.readbyqxmd.com/read/29722599/champions-are-racers-not-pacers-an-analysis-of-qualification-patterns-of-olympic-and-iaaf-world-championship-middle-distance-runners
#6
Brian Hanley, Florentina J Hettinga
The aim of this study was to analyse qualification patterns in middle distance running and identify whether athletes adopt theoretically optimal tactics, or whether the will to win overrides these. The performances of 295 men and 258 women finalists in the Olympic and IAAF World Championship 800 m and 1500 m events from 1999 to 2017 were analysed across all three rounds of competition. Finishing position, time and ranking amongst all competitors were found for each athlete. Position in the final was correlated with finishing position in the heats and semi-finals (all P < 0...
May 3, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29706867/rna-sequencing-reveals-unique-transcriptional-signatures-of-running-and-running-independent-environmental-enrichment-in-the-adult-mouse-dentate-gyrus
#7
Catherine-Alexandra Grégoire, Stephanie Tobin, Brianna L Goldenstein, Éric Samarut, Andréanne Leclerc, Anne Aumont, Pierre Drapeau, Stephanie Fulton, Karl J L Fernandes
Environmental enrichment (EE) is a powerful stimulus of brain plasticity and is among the most accessible treatment options for brain disease. In rodents, EE is modeled using multi-factorial environments that include running, social interactions, and/or complex surroundings. Here, we show that running and running-independent EE differentially affect the hippocampal dentate gyrus (DG), a brain region critical for learning and memory. Outbred male CD1 mice housed individually with a voluntary running disk showed improved spatial memory in the radial arm maze compared to individually- or socially-housed mice with a locked disk...
2018: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/29666760/barefoot-running-does-not-affect-simple-reaction-time-an-exploratory-study
#8
Nicholas J Snow, Jason F L Blair, Graham Z MacDonald, Jeannette M Byrne, Fabien A Basset
Background: Converging evidence comparing barefoot (BF) and shod (SH) running highlights differences in foot-strike patterns and somatosensory feedback, among others. Anecdotal evidence from SH runners attempting BF running suggests a greater attentional demand may be experienced during BF running. However, little work to date has examined whether there is an attentional cost of BF versus SH running. Objective: This exploratory study aimed to examine whether an acute bout of BF running would impact simple reaction time (SRT) compared to SH running, in a sample of runners naïve to BF running...
2018: PeerJ
https://www.readbyqxmd.com/read/29657452/impact-of-various-foot-arches-on-dynamic-balance-and-speed-performance-in-collegiate-short-distance-runners-a-cross-sectional-comparative-study
#9
Selvaraj Sudhakar, S Veena Kirthika, K Padmanabhan, G Mohan Kumar, C V Senthil Nathan, R Gopika, Asir John Samuel
Objective: To compare the impact of foot arches on dynamic balance and speed performance. Materials and methods: 30 collegiate male short distance runners were divided into three groups based on foot arches, high, neutral and low. Balance and speed performance were estimated based on scores of star excursion balance test (SEBT), 40 yard dash test and vertical jump test (VJT). Results: Significant improved scores (p < 0.001) were noted in SEBT, 40 yard dash test and VJT...
March 2018: Journal of Orthopaedics
https://www.readbyqxmd.com/read/29651510/-vomiting-and-collapse-of-a-28-year-old-male-long-distance-runner-in-middle-european-summer
#10
J Herold, A Mitrasch, E Lorenz, U Lodes, I Tanev, R Braun-Dullaeus, F Meyer
BACKGROUND: Hyperthermia often ends fatally and must therefore be promptly recognized and adequately treated. CASE: A 28-year-old man participated in a long-distance race (3 km) on a hot summer day (28 °C). The runner collapsed, had to vomit but continued the run and reached the finish. Neurologically, the patient presented with intermittent cerebral seizures. External cooling batteries were immediately applied and cold infusions were started. The patient was admitted to the intensive care unit of the university hospital (body temperature 40...
April 12, 2018: Der Internist
https://www.readbyqxmd.com/read/29650412/theoretical-considerations-for-muscle-energy-savings-during-distance-running
#11
Jared R Fletcher, Brian R MacIntosh
We have recently demonstrated that the triceps surae muscles energy cost (ECTS ) represents a substantial portion of the total metabolic cost of running (Erun ). Therefore, it seems relevant to evaluate the factors which dictate ECTS , namely the amount and velocity of shortening, since it is likely these factors will dictate Erun . Erun and triceps surae morphological and AT mechanical properties were obtained in 46 trained and elite male and female distance runners using ultrasonography and dynamometry. ECTS (J·stride-1 ) at the speed of lactate threshold (sLT) was estimated from AT force and crossbridge mechanics and energetics...
March 27, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29644086/is-recreational-running-associated-with-earlier-delivery-and-lower-birth-weight-in-women-who-continue-to-run-during-pregnancy-an-international-retrospective-cohort-study-of-running-habits-of-1293-female-runners-during-pregnancy
#12
Katy Kuhrt, Mark Harmon, Natasha L Hezelgrave, Paul T Seed, Andrew H Shennan
Background: Increasingly, women of reproductive age participate in recreational running, but its impact on pregnancy outcome is unknown. We investigated whether running affects gestational age at delivery and birth weight as indicators of cervical integrity and placental function, respectively. Methods: 1293 female participants were recruited from parkrun, which organises weekly runs involving 1.25 million runners across 450 parks worldwide. Those under 16 or unable to provide outcome data were excluded...
2018: BMJ Open Sport & Exercise Medicine
https://www.readbyqxmd.com/read/29643814/impact-of-short-term-training-camp-on-aortic-blood-pressure-in-collegiate-endurance-runners
#13
Tsubasa Tomoto, Jun Sugawara, Ai Hirasawa, Tomoko Imai, Seiji Maeda, Shigehiko Ogoh
To investigate the influence of short-term vigorous endurance training on aortic blood pressure (BP), pulse wave analysis was performed in 36 highly trained elite collegiate endurance runners before and after a 7-day intense training camp. Subjects participated three training sessions per day, which mainly consisted of long distance running and sprint training to reach the daily target distance of 26 km. After the camp, they were divided into two groups based on whether the target training was achieved. Aortic systolic BP, pulse pressure, and tension-time index (TTI, a surrogate index of the myocardial oxygen demand) were significantly elevated after the camp in the accomplished group but not in the unaccomplished group, whereas the brachial BP remained unchanged in both groups...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29623649/influence-of-an-acute-exercise-until-exhaustion-on-serum-and-urinary-concentrations-of-molybdenum-selenium-and-zinc-in-athletes
#14
Marcos Maynar, Diego Muñoz, Javier Alves, Gema Barrientos, Francisco Javier Grijota, María Concepción Robles, Francisco Llerena
The aim of the present study was to determine changes occurring in serum and urine concentrations of essential trace elements with proven essentiality (molybdenum, selenium, and zinc) as a result of performing an acute physical activity until exhaustion in middle- and long-distance runners who live in the same area of Extremadura (Spain). Twenty-one Spanish national middle- and long-distance runners and 26 sedentary students of a similar age were recruited for the study. Both groups ran on a treadmill until exhaustion, starting at a speed of 10 and 8 km/h, respectively, and increasing the speed at 1 km/h every 400 m, without modifying the slope, always within the recommended parameters...
April 5, 2018: Biological Trace Element Research
https://www.readbyqxmd.com/read/29599872/responsiveness-of-the-countermovement-jump-and-handgrip-strength-to-an-incremental-running-test-in-endurance-athletes-influence-of-sex
#15
Felipe García-Pinillos, Pedro Delgado-Floody, Cristian Martínez-Salazar, Pedro Á Latorre-Román
The present study analyzed the acute effects of an incremental running test on countermovement jump (CMJ) and handgrip strength performance in endurance athletes, considering the effect of post-exercise recovery time and sex. Thirty-three recreationally trained long-distance runners, 20 men and 13 women, participated voluntarily in this study. The participants performed the Léger test, moreover, the CMJ and handgrip strength tests were carried out before and after the running test and during different stages of recovery (at the 1st min of recovery (posttest1), 5th min of recovery (posttest2), and 10th min of recovery (posttest3))...
March 2018: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29576951/change-in-skeletal-muscle-stiffness-after-running-competition-is-dependent-on-both-running-distance-and-recovery-time-a-pilot-study
#16
Seyedali Sadeghi, Cassidy Newman, Daniel H Cortes
Long-distance running competitions impose a large amount of mechanical loading and strain leading to muscle edema and delayed onset muscle soreness (DOMS). Damage to various muscle fibers, metabolic impairments and fatigue have been linked to explain how DOMS impairs muscle function. Disruptions of muscle fiber during DOMS exacerbated by exercise have been shown to change muscle mechanical properties. The objective of this study is to quantify changes in mechanical properties of different muscles in the thigh and lower leg as function of running distance and time after competition...
2018: PeerJ
https://www.readbyqxmd.com/read/29570600/the-age-of-peak-marathon-performance-in-cross-country-skiing-the-engadin-ski-marathon
#17
Beat Knechtle, Pantelis T Nikolaidis
Knechtle, B and Nikolaidis, PT. The age of peak marathon performance in cross-country skiing-the "Engadin Ski Marathon." J Strength Cond Res 32(4): 1131-1136, 2018-The age of the best endurance performance has been well investigated in flat city running marathons. However, we have no knowledge about the age of peak marathon performance in cross-country skiing, which would be of great practical value for athletes and coaches. Therefore, the aim of the present study was to examine the age of peak marathon performance in cross-country skiing...
April 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29566549/mid-term-development-of-the-right-ventricle-in-competitive-athletes
#18
Patrick Krumm, Stefan Krauß, Stefanie Mangold, Tanja Zitzelsberger, Bernhard D Klumpp, Konstantin Nikolaou, Andreas M Nieß, Ulrich Kramer, Christof Burgstahler
Background Long-term intensive training induces physiological, morphological, and functional adaption of the athlete's heart. Purpose To evaluate the development of athlete's heart during a mid-term follow-up of competitive athletes using cardiac magnetic resonance (CMR). Material and Methods Eighteen competitive long-distance runners and triathletes (age 43 ± 13 years, 3 women) were prospectively examined in a longitudinal follow-up study 5.05 ± 0.6 years after baseline. CMR at 1.5-T was performed for functional and late gadolinium enhancement (LGE) imaging...
January 1, 2018: Acta Radiologica
https://www.readbyqxmd.com/read/29562613/effects-of-low-versus-moderate-glycemic-index-diets-on-aerobic-capacity-in-endurance-runners-three-week-randomized-controlled-crossover-trial
#19
Krzysztof Durkalec-Michalski, Emilia E Zawieja, Bogna E Zawieja, Dominika Jurkowska, Maciej S Buchowski, Jan Jeszka
The glycemic index (GI) of ingested carbohydrates may influence substrate oxidation during exercise and athletic performance. Therefore, the aim of this study was to assess the effect of low- and moderate-GI three-week diets on aerobic capacity and endurance performance in runners. We conducted a randomized crossover feeding study of matched diets differing only in GI (low vs. moderate) in 21 endurance-trained runners. Each participant consumed both, low- (LGI) and moderate-GI (MGI) high-carbohydrate (~60%) and nutrient-balanced diets for three weeks each...
March 17, 2018: Nutrients
https://www.readbyqxmd.com/read/29561907/pilates-training-improves-5-km-run-performance-by-changing-metabolic-cost-and-muscle-activity-in-trained-runners
#20
Paula Finatto, Edson Soares Da Silva, Alexandre B Okamura, Bruna P Almada, Henrique B Oliveira, Leonardo A Peyré-Tartaruga
PURPOSE: Strength training improves distance running economy and performance. This finding is based predominantly on maximal and explosive strength programmes applied to locomotor muscles, particularly on the lower limbs. It is not certain whether a minimization of metabolic cost (Cmet) and an improvement in running performance is feasible with strength training of the postural and trunk muscles. METHODS: Using kinematic, neuromuscular and metabolic measurements of running at two different speeds before and after a 12-week Pilates training programme, we tested the hypothesis that core training might improve the running Cmet and performance of trained runners...
2018: PloS One
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