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Medicine and Science in Sports and Exercise

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https://www.readbyqxmd.com/read/28319590/endocannabinoid-and-mood-responses-to-exercise-in-adults-with-varying-activity-levels
#1
Angelique G Brellenthin, Kevin M Crombie, Cecilia J Hillard, Kelli F Koltyn
Acute aerobic exercise improves mood and activates the endocannabinoid (eCB) system in physically active individuals; however, both mood and eCB responses to exercise may vary based on habitual levels of physical activity. PURPOSE: To examine eCB and mood responses to prescribed and preferred exercise among individuals with low, moderate, and high levels of physical activity. METHODS: Thirty-six healthy adults (21±4yrs) were recruited from low (≤60min moderate-vigorous physical activity [MVPA]/wk), moderate (150-299min MVPA/wk), and high (≥300 MVPA/wk) physical activity groups...
March 18, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28319589/exercise-improves-v-combining-dot-above-o-2max-and-body-composition-in-adt-treated-prostate-cancer-patients
#2
Bradley A Wall, Daniel A Galvão, Naeem Fatehee, Dennis R Taaffe, Nigel Spry, David Joseph, Jeffrey J Hebert, Robert U Newton
INTRODUCTION: Prostate cancer is the most common cancer in men and patients treated with androgen deprivation therapy (ADT) experience unfavourbale changes in body composition and associated metabolic complications, which can increase the risk of cardiovascular disease. We examined the effect of a 6-month program of aerobic and resistance exercise aimed at improving body composition and cardiorespiratory health in this population. METHODS: Ninety-seven men (43-90 years) with localized prostate cancer receiving ADT were randomized to either exercise (EX, n=50) or usual care (CON, n=47)...
March 18, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28319588/physical-activity-and-global-self-worth-in-a-longitudinal-study-of-children
#3
Hudson Reddon, David Meyre, John Cairney
PURPOSE: Physical activity is associated with an array of physical and mental health benefits among children and adolescents. The development of self-worth/self-esteem has been proposed as a mechanism to explain the mental health benefits derived from physical activity. Despite several studies that have analyzed the association between physical activity and self-worth, the results have been inconsistent. It is also uncertain how related physical health measures, such as sedentary behaviour, body composition and fitness influence the relationship between physical activity and self-worth over time...
March 18, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28319587/sedentary-behavior-physical-activity-and-fitness-the-maastricht-study
#4
Jeroen Hpm van der Velde, Annemarie Koster, Julianne D van der Berg, Simone Js Sep, Carla Jh van der Kallen, Pieter C Dagnelie, Miranda T Schram, Ronald Ma Henry, Simone Jpm Eussen, Martien Cjm van Dongen, Coen DA Stehouwer, Nicolaas C Schaper, Hans Hcm Savelberg
PURPOSE: This cross-sectional study examined the mutual independent associations of sedentary behavior, lower intensity physical activity (LPA) and higher intensity physical activity HPA (an approximation of moderate to vigorous physical activity (MVPA) with cardio-respiratory fitness (CRF). METHODS: 2,024 participants were included from The Maastricht Study (mean±SD age: 59.7±8.1 years, 49.6% men). With the activPAL3 activity monitor we assessed sedentary time (ST), sedentary pattern variables (number of sedentary breaks, average sedentary bout duration, and number of prolonged sedentary bouts (≥30 min)), LPA, and HPA...
March 18, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28319586/short-term-exercise-training-alters-leukocyte-chemokine-receptors-in-obese-adults
#5
Julianne C Barry, Svetlana Simtchouk, Cody Durrer, Mary E Jung, Jonathan P Little
Obesity is characterized by chronic low-grade inflammation driven by activation and tissue infiltration of circulating leukocytes. Although exercise has anti-inflammatory effects, the impact of exercise on mediators of leukocyte migration is unclear. PURPOSE: To determine the impact of high intensity interval training (HIIT) versus moderate intensity continuous training (MICT), in the absence of weight/fat loss, on circulating chemokines and leukocyte chemokine receptors. METHODS: Thirty-seven inactive obese adults were randomized to two weeks (10 sessions) of HIIT or MICT with fasting blood samples collected before and after training...
March 18, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28319585/increased-fatigue-response-to-augmented-deceptive-feedback-during-cycling-time-trial
#6
Guillaume P Ducrocq, Thomas J Hureau, Olivier Meste, Grégory M Blain
PURPOSE: This study aimed to investigate the effect of different magnitudes of deception on performance and exercise-induced fatigue during cycling time-trial. METHODS: Following three familiarization visits, three females and eight males performed three 5 km cycling time-trials while following a simulated dynamic avatar reproducing either 100% (5K100%), 102% (5K102%) or 105% (5K105%) of the subject's previous fastest trial. Quadriceps muscle activation was quantified with surface electromyography...
March 18, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28291023/central-contribution-to-electrically-induced-fatigue-depends-on-stimulation-frequency
#7
Sidney Grosprêtre, Nicolas Gueugneau, Alain Martin, Romuald Lepers
PURPOSE: This study analyzed the impact of several protocols of neuromuscular electrical stimulation (NMES), matched with a similar total torque-time integral, on muscle activation pathways and neuromuscular fatigue. METHODS: Ten young healthy participants (age: 24.6 ± 4.2) performed 3 randomized NMES sessions on the triceps surae muscles with 20 Hz, 60 Hz or 100 Hz stimulation frequencies (pulse duration: 1 ms), with pulse amplitude (IES) set at 20 % of isometric maximal voluntary contraction (MVC)...
March 13, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28291022/effects-of-descending-stair-walking-on-health-and-fitness-of-elderly-obese-women
#8
Trevor C Chen, Chung-Chan Hsieh, Kuo-Wei Tseng, Chih-Chiao Ho, Kazunori Nosaka
PURPOSE: Eccentric exercise training produces positive fitness and health outcomes, but whether this is also the case for descending stair walking (DSW) is unknown. This study investigated the hypothesis that DSW would improve insulin sensitivity, lipid profiles and physical fitness better than ascending stair walking (ASW). METHODS: Elderly (≥60 y) obese women were placed to either DSW or ASW group (n=15/group). An elevator was used to eliminate ascending stairs for DSW, and descending stairs for ASW...
March 13, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28288012/influence-of-upper-body-exercise-on-the-fatigability-of-human-respiratory-muscles
#9
Nicholas B Tiller, Ian G Campbell, Lee M Romer
PURPOSE: Diaphragm and abdominal muscles are susceptible to contractile fatigue in response to high-intensity, whole-body exercise. This study assessed whether the ventilatory and mechanical loads imposed by high-intensity, upper-body exercise would be sufficient to elicit respiratory muscle fatigue. METHODS: Seven healthy men (mean±SD: age 24±4 y; peak O2 uptake [V[Combining Dot Above]O2 peak] 31.9±5.3 ml/kg/min) performed asynchronous arm-crank exercise to exhaustion at work rates equivalent to 30% (heavy) and 60% (severe) of the difference between gas-exchange threshold and V[Combining Dot Above]O2 peak...
March 10, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28288011/using-activity-monitors-to-measure-sit-to-stand-transitions-in-overweight-obese-youth
#10
Tarrah Mitchell, Kelsey Borner, Jonathan Finch, Jacqueline Kerr, Jordan Carlson
INTRODUCTION: Reducing sedentary behavior has emerged as an important health intervention strategy. Although hip-worn, and more recently wrist-worn, accelerometers are commonly used for measuring physical activity and sedentary behavior, they may not provide accurate measures of postural changes. The current study examined the validity of commonly used hip- and wrist-worn accelerometer cut points and the thigh-worn activPAL activity monitor for measuring sit-to-stand transitions as compared to direct observation in youth with overweight and obesity...
March 10, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28282326/effects-of-mental-fatigue-on-endurance-performance-in-the-heat
#11
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/28277407/iron-deficiency-and-anemia-among-collegiate-athletes-a-retrospective-chart-review
#12
Rachel B Parks, Scott J Hetzel, M Alison Brooks
PURPOSE: To describe the prevalence of anemia among incoming female college athletes and to characterize the results and expenses of iron-related testing at one NCAA Division I institution. METHODS: In this retrospective medical record review, hemoglobin (Hgb) and ferritin (Fer) lab values were obtained for student-athletes at a single institution, 2002 - 2014. Labs were collected either as part of the pre-participation exam (PPE) for female athletes, routine screening for cross country athletes, or as needed for medical evaluation...
March 8, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28277406/comparable-neutrophil-responses-for-arm-and-intensity-matched-leg-exercise
#13
Christof A Leicht, Victoria L Goosey-Tolfrey, Nicolette C Bishop
INTRODUCTION: Arm exercise is performed at lower absolute intensities than lower body exercise. This may impact on intensity dependent neutrophil responses and it is unknown whether individuals restricted to arm exercise experience the same changes in the neutrophil response as found for lower body exercise. Therefore, we aimed to investigate the importance of exercise modality and relative exercise intensity on the neutrophil response. METHODS: Twelve moderately trained males performed three 45-min constant load exercise trials following determination of peak oxygen uptake for arm exercise (V[Combining Dot Above]O2peak arms) and cycling (V[Combining Dot Above]O2peak legs): (1) arm cranking exercise at 60%V[Combining Dot Above]O2peak arms; (2) moderate cycling at 60%V[Combining Dot Above]O2peak legs; and (3) easy cycling at 60%V[Combining Dot Above]O2peak arms...
March 8, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28277405/the-preferred-movement-path-paradigm-influence-of-running-shoes-on-joint-movement
#14
Benno M Nigg, Jordyn Vienneau, Aimée C Smith, Matthieu B Trudeau, Maurice Mohr, Sandro R Nigg
PURPOSE: (a) to quantify differences in lower extremity joint kinematics for groups of runners subjected to different running footwear conditions, and (b) to quantify differences in lower extremity joint kinematics on an individual basis for runners subjected to different running footwear conditions. METHODS: Three-dimensional ankle and knee joint kinematics were collected for 35 heel-toe runners when wearing three different running shoes and when running barefoot...
March 8, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28277404/associations-of-vigorous-intensity-physical-activity-with-biomarkers-in-youth
#15
Justin B Moore, Michael W Beets, Keith Brazendale, Steven N Blair, Russell R Pate, Lars B Andersen, Sigmund A Anderssen, Anders Grøntved, Pedro C Hallal, Katarzyna Kordas, Susi Kriemler, John J Reilly, Luis B Sardinha
INTRODUCTION: Physical activity (PA) conveys known cardiometabolic benefits to youth, but the contribution of vigorous-intensity PA (VPA) to these benefits is unknown. Therefore, we sought to determine, a) the associations between VPA and cardiometabolic biomarkers independent of moderate-intensity PA (MPA) and time sedentary, and b) the accelerometer cutpoint that best represents the threshold for health-promoting VPA in youth. METHODS: Data from the International Children's Accelerometry Database (ICAD) were analyzed in 2015...
March 8, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28277403/methylphenidate-enhances-grip-force-and-alters-brain-connectivity
#16
Michael King, Laurie H Rauch, Samantha J Brooks, Dan J Stein, Kai Lutz
INTRODUCTION: A central fatigue theory proposes that force output during fatiguing exercise is limited to maintain homeostasis. The self-awareness of the body's homeostatic state is known as interoception. Brain regions thought to play a role in interoception, such as the insular and orbital frontal cortex, have been proposed as sites for the upstream regulation of fatiguing exercise. Methylphenidate (MPH) can improve force output during exercise and may alter central processes during fatiguing exercise...
March 8, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28277402/a-multifactorial-criteria-based-progressive-algorithm-for-hamstring-injury-treatment
#17
Jurdan Mendiguchia, Enrique Martinez-Ruiz, Pascal Edouard, Jean-Benoît Morin, Francisco Martinez-Martinez, Fernando Idoate, Alberto Mendez-Villanueva
INTRODUCTION: Given the prevalence of hamstring injuries in football, a rehabilitation program that effectively promotes muscle tissue repair and functional recovery is paramount to minimize re-injury risk and optimize player performance and availability. PURPOSE: To assess the concurrent effectiveness of administering an individualized and multifactorial criteria-based algorithm (RA) on hamstring injury rehabilitation in comparison to employing a general rehabilitation protocol (RP)...
March 8, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28272267/targeting-reductions-in-sitting-time-to-increase-physical-activity-and-improve-health
#18
Sarah K Keadle, David E Conroy, Matthew P Buman, David W Dunstan, Charles E Matthews
New evidence suggests that reductions in sedentary behavior may increase physical activity and improve health. These findings point to new behavioral targets for intervention and new ways to think about intervening to increase overall physical activity in the population. This report provides a knowledge update reflecting the rapid accumulation of new evidence related to sedentary behavior and health among adults. Recent observational studies suggest that leveraging the time-inverse relationship between sedentary and active behaviors by replacing sitting with standing, light or moderate-intensity activity can have important health benefits, particularly among less active adults...
March 8, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28272266/lack-of-activation-of-mitophagy-during-endurance-exercise-in-human
#19
Céline Schwalm, Louise Deldicque, Marc Francaux
PURPOSE: To determine whether fission and mitophagy are activated by acute endurance exercise in human skeletal muscle and to investigate if this activation is dependent upon the nutritional state. METHODS: Trained athletes (n = 7) cycled for 2 h at 70% VO2 peak in a fed or fasted state. Vastus lateralis muscle biopsies were obtained at baseline, before, immediately after and 1 h after exercise. Protein and mRNA markers for mitophagy, mitochondrial biogenesis, fission and fusion were analyzed using qRT-PCR and Western blot...
March 8, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28272268/firefighter-work-duration-influences-the-extent-of-acute-kidney-injury
#20
Zachary J Schlader, Christopher L Chapman, Suman Sarker, Lindsey Russo, Todd C Rideout, Mark D Parker, Blair D Johnson, David Hostler
PURPOSE: We tested the hypothesis that elevations in biomarkers of acute kidney injury are influenced by the magnitude of hyperthermia and dehydration elicited by two common firefighter work durations. METHODS: Twenty-nine healthy adults (10 females) wearing firefighter protective clothing completed two randomized trials where they walked at 4.8 kph, 5% grade in a 38°C, 50% RH environment. In the SHORT trial, subjects completed two 20 min exercise bouts. In the LONG trial, subjects completed three 20 min exercise bouts...
March 7, 2017: Medicine and Science in Sports and Exercise
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20196
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