journal
MENU ▼
Read by QxMD icon Read
search

Medicine and Science in Sports and Exercise

journal
https://www.readbyqxmd.com/read/28422771/slow-intermuscular-oscillations-are-associated-with-cocontraction-steadiness
#1
Nayef E Ahmar, Minoru Shinohara
PURPOSE: Voluntary muscle contraction often involves low-frequency correlated neural oscillations across muscles, which may degrade steady cocontraction between antagonistic muscles with distinct levels of activation per each muscle (unbalanced cocontraction). The purposes of the study were 1) to determine whether there is an association between the low-frequency correlated EMG oscillations and performance of steady unbalanced cocontraction across individuals and 2) to determine whether a bout of out-of-phase cocontraction practice reduces the in-phase low-frequency correlated neural oscillations and improves the performance of steady unbalanced cocontraction...
April 19, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28422770/technical-alterations-during-an-incremental-field-test-in-elite-male-tennis-players
#2
Cyril Brechbuhl, Olivier Girard, Grégoire P Millet, Laurent Schmitt
PURPOSE: We investigated technical and physiological responses along with their relationships during an incremental field test to exhaustion specific to tennis (TEST) in elite players. METHODS: Twenty male elite tennis players completed TEST, which consisted of hitting alternatively forehand and backhand strokes at increasing ball frequency (ball machine) every minute. Ball accuracy (BA), ball velocity (BV) and tennis performance index (TP = BA x BV) were determined by radar and video analysis for each stroke, in addition to cardiorespiratory responses and blood lactate concentrations...
April 19, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28419028/physical-activity-assessment-with-the-actigraph-gt3x-and-doubly-labeled-water
#3
Andrea K Chomistek, Changzheng Yuan, Charles E Matthews, Richard P Troiano, Heather R Bowles, Jennifer Rood, Junaidah B Barnett, Walter C Willett, Eric B Rimm, David R Bassett
PURPOSE: To compare the degree to which four accelerometer metrics-total activity counts per day (TAC/d), steps per day (steps/d), physical activity energy expenditure (PAEE, kcal/kg/day), and moderate- to vigorous-intensity physical activity (MVPA, min/d)- were correlated with PAEE measured by doubly-labeled water (DLW). Additionally, accelerometer metrics based on vertical axis counts and triaxial counts were compared. METHODS: This analysis included 684 women and 611 men aged 43 - 83 years...
April 18, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28419027/athletes-intending-to-use-sports-supplements-are-more-likely-to-respond-to-a-placebo
#4
Philip Hurst, Abby Foad, Damian Coleman, Chris Beedie
PURPOSE: We investigated associations between athletes' use of sport supplements and their responsiveness to placebo and nocebo interventions. METHODS: Participants (n=627) reported their intention to use, and actual use of, sport supplements. They then completed a 5x20m repeat sprint protocol in the baseline condition, prior to being randomized to one of three treatments. Participants in the positive-belief treatment were administered an inert capsule described as a potent supplement which would improve sprint performance...
April 18, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28419026/the-gas-sampling-interval-effect-on-vo2peak-is-independent-of-exercise-protocol
#5
Cory M Scheadler, Matthew J Garver, Nicholas J Hanson
INTRODUCTION: There is a plethora of gas sampling intervals available during cardiopulmonary exercise (CPX) testing to measure peak oxygen consumption (VO2peak). Different intervals can lead to altered VO2peaks. Whether differences are affected by the exercise protocol or subject sample is not clear. The purpose of this investigation was to determine whether VO2peak differed due to manipulation of sampling intervals and whether differences were independent of the protocol and subject sample...
April 18, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28419025/ensemble-methods-for-classification-of-physical-activities-from-wrist-accelerometry
#6
Alok Kumar Chowdhury, Dian Tjondronegoro, Vinod Chandran, Stewart G Trost
PURPOSE: To investigate whether the use of ensemble learning algorithms improve physical activity recognition accuracy compared to the single classifier algorithms, and to compare the classification accuracy achieved by three conventional ensemble machine learning methods (bagging, boosting, random forest) and a custom ensemble model comprising four algorithms commonly used for activity recognition (binary decision tree, k nearest neighbour, support vector machine, and neural network)...
April 18, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28419024/the-effects-of-exercise-training-on-anxiety-in-fibromyalgia-patients-a-meta-analysis
#7
Cillian P McDowell, Dane B Cook, Matthew P Herring
Physical inactivity and comorbid anxiety symptoms are prevalent among fibromyalgia (FM) patients. Exercise training may be an effective alternative therapy to reduce these symptoms. PURPOSE: To evaluate the effects of exercise training on anxiety symptoms in patients with FM, and to examine whether variables of theoretical or practical importance moderate the estimated mean effect. METHODS: Twenty-five effects were derived from 10 articles published before June 2016 located using Google Scholar, MEDLINE, PsycINFO, PubMed, and Web of Science...
April 18, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28398949/sildenafil-possible-prophylaxis-against-swimming-induced-pulmonary-edema-sipe
#8
Stefanie D Martina, John J Freiberger, Dionne F Peacher, Michael J Natoli, Eric A Schinazi, Dawn N Kernagis, Jennifer Av Potter, Claire E Otteni, Richard E Moon
Swimming-induced pulmonary edema (SIPE) occurs during swimming and scuba diving, usually in cold water, in susceptible healthy individuals, especially military recruits and triathletes. We have previously demonstrated that pulmonary artery pressure (PAP) and pulmonary artery wedge pressure (PAWP) are higher during immersed exercise in SIPE-susceptible individuals vs. controls, confirming that SIPE is a form of hemodynamic pulmonary edema. Oral sildenafil 50 mg 1 hour before immersed exercise reduced PAP and PAWP, suggesting that sildenafil may prevent SIPE...
April 11, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28398948/angiopoietin-like-4-enhances-the-proliferation-and-migration-of-tendon-fibroblasts
#9
Sarwat Jamil, Rouhollah Mousavizadeh, Mani Roshan-Moniri, Scott J Tebbutt, Robert G McCormack, Vincent Duronio, Alex Scott
PURPOSE: Angiopoietin-like 4 (ANGPTL4) is known to play a variety of roles in the response to exercise, and more recently has been shown to enhance the healing of tendon, a fibrous load-bearing tissue required for efficient movement. The objective of the current study was to further explore the mechanisms of ANGPTL4's impact on tendon cells using a gene array approach. METHODS: Human tendon fibroblasts were treated with recANGPTL4 and their global transcriptome response analyzed after 4 and 24 hours...
April 11, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28398947/acidosis-but-not-alkalosis-affects-anaerobic-metabolism-and-performance-in-a-4-km-time-trial
#10
Carlos Rafaell Correia-Oliveira, João Paulo Lopes-Silva, Romulo Bertuzzi, Glenn K McConell, David John Bishop, Adriano Eduardo Lima-Silva, Maria Augusta Peduti Dal'Molin Kiss
PURPOSE: To determine the effect of pre-exercise metabolic acidosis and alkalosis on power output (PO) and aerobic and anaerobic energy expenditure during a 4-km cycling time trial (TT). METHODS: Eleven recreationally trained cyclists (VO2peak 54.1 ± 9.3 mL·kg·min) performed a 4-km TT 100 min after ingesting in a double-blind matter 0.15 g·kg of body mass of ammonium chloride (NH4Cl, acidosis), 0.3 g·kg of sodium bicarbonate (NaHCO3, alkalosis) or 0.15 g·kg of CaCO3 (placebo)...
April 11, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28398946/high-intensity-interval-training-appetite-and-reward-value-of-food-in-the-obese
#11
Catia Martins, Irina Aschehoug, Marit Ludviksen, Jens Holst, Graham Finlayson, Ulrik Wisloff, Linda Morgan, Neil King, Bård Kulseng
PURPOSE: Studies on the impact of chronic interval training on appetite in the obese population are scarce. The aim of this study was to determine the effect of 12 weeks of isocaloric programs of moderate-intensity continuous training (MICT) or high-intensity interval training (HIIT), or a short-duration HIIT (1/2HIIT), on subjective feelings of appetite, appetite-related hormones and reward value of food in sedentary obese individuals. METHODS: Forty-six sedentary obese individuals (30 women and 16 men), with a BMI of 33...
April 11, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28398945/objective-measures-of-physical-activity-and-cardiometabolic-and-endocrine-biomarkers
#12
Hala B AlEssa, Andrea K Chomistek, Susan E Hankinson, Junaidah B Barnett, Jennifer Rood, Charles E Matthews, Eric B Rimm, Walter C Willett, Frank B Hu, Deirdre K Tobias
PURPOSE: Although physical activity is an established risk factor for chronic disease prevention, the specific mechanisms underlying these relationships are poorly understood. We examined the associations between total activity counts (TAC) and moderate-vigorous physical activity (MVPA) measured by accelerometer, and physical activity energy expenditure (PAEE) measured by doubly-labeled water, with plasma levels of pro-insulin, insulin, c-peptide, IGFBP-3, IGF-1, adiponectin, leptin and leptin-sR...
April 11, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28398944/alpine-skiing-as-winter-time-high-intensity-training
#13
Thomas Stöggl, Christoph Schwarzl, Edith E Müller, Masaru Nagasaki, Julia Stöggl, Martin Schönfelder, Josef Niebauer
INTRODUCTION: To counteract the winter activity deficit, we set out to analyze cardiorespiratory and metabolic responses of two high intensity training (HIT) protocols during alpine skiing (AS), cross-country skiing (XCS) and indoor cycling (IC) and the effects of sex, age and fitness level in this comparison. METHODS: Nineteen healthy subjects (two age and fitness groups, both sexes) performed AS, XCS, and IC with measurements of oxygen uptake (VO2), energy expenditure (EE), heart rate (HR), lactate, blood glucose and rate of perceived exertion, determined during 4-min of continuous high intensity (HITc: 90% HRmax for XCS and IC or short turn skiing during AS) or 10-min intermittent HIT [HITint: 5x1' high intensity (>90% HRmax or short turn skiing), 1' active recovery]...
April 11, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28398943/cardiorespiratory-fitness-and-risk-of-fatty-liver-the-young-finns-study
#14
Kristiina S Pälve, Katja Pahkala, Emmi Suomela, Heikki Aatola, Janne Hulkkonen, Markus Juonala, Terho Lehtimäki, Tapani Rönnemaa, Jorma S A Viikari, Mika Kähönen, Nina Hutri-Kähönen, Risto Telama, Tuija Tammelin, Olli T Raitakari
PURPOSE: Fatty liver is an expanding health concern associated with metabolic disturbances and increased risk of cardiovascular disease. Experimental studies in animals have shown associations between fatty liver and cardiorespiratory fitness but limited data exist in humans. The aim of this study was to analyze the links between cardiorespiratory fitness and fatty liver in a population based sample of adults. METHODS: Participants were 463 adults (48% males) from the Cardiovascular Risk in Young Finns Study...
April 11, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28398950/a-ketone-ester-drink-increases-postexercise-muscle-glycogen-synthesis-in-humans
#15
David A Holdsworth, Peter J Cox, Tom Kirk, Huw Stradling, Samuel G Impey, Kieran Clarke
INTRODUCTION: Physical endurance can be limited by muscle glycogen stores, in that glycogen depletion markedly reduces external work. During carbohydrate restriction, the liver synthesises the ketone bodies, D-β-hydroxybutyrate and acetoacetate, from fatty acids. In animals and in the presence of glucose, D-β-hydroxybutyrate promotes insulin secretion and increases glycogen synthesis. Here we determined whether a dietary ketone ester, combined with plentiful glucose, can increase post-exercise glycogen synthesis in human skeletal muscle...
April 10, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28350716/movement-strategies-among-groups-of-chronic-ankle-instability-coper-and-control
#16
S Jun Son, Hyunsoo Kim, Mattew K Seeley, J Ty Hopkins
INTRODUCTION: Comprehensive evaluation of movement strategies during functional movement is a difficult undertaking. Because of this challenge, studied movements have been over simplified. Furthermore, evaluating movement strategies at only a discrete time point(s) provide limited insight into how movement strategies may change or adapt in chronic ankle instability (CAI) patients. This study aimed to identify abnormal movement strategies in individuals with a history of ankle sprain injury during a sports maneuver compared to healthy controls...
March 27, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28350715/continuous-cardiac-autonomic-and-haemodynamic-responses-to-isometric-exercise
#17
Katrina A Taylor, Jonathan D Wiles, Damian D Coleman, Rajan Sharma, Jamie M O'Driscoll
PURPOSE: Elevated arterial blood pressure (BP) is associated with autonomic dysfunction and impaired haemodynamic control mechanisms. Isometric exercise (IE) training has been demonstrated effective at reducing BP; however, the continuous cardiovascular responses during IE are underinvestigated. We hypothesized that reflex autonomic cardiovascular control is an important mediator in reducing BP. To test our hypothesis, we investigated continuous cardiac autonomic modulation and baroreceptor reflex sensitivity (BRS) in response to IE...
March 27, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28350714/multiple-transportable-carbohydrate-impact-on-long-distance-triathlon-performance
#18
David S Rowlands, Stuart D Houltham
The ingestion of multiple (2:1 glucose:fructose) transportable carbohydrate in beverages at high rates (>78 g·h) during endurance exercise enhances exogenous carbohydrate oxidation, fluid absorption, gut comfort, and performance, relative to glucose alone. But during long-distance endurance competition, athletes prefer a solid-gel-drink format, and the effect size of multiple-transportable carbohydrate is unknown. PURPOSE: To determine the effect of multiple-transportable carbohydrate on triathlon competition performance when ingested within bars, gels, and drinks...
March 27, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28350713/sex-specific-maximum-predicted-heart-rate-and-its-prognosis-for-mortality-and-mi
#19
Haitham M Ahmed, Mouaz H Al-Mallah, Steven J Keteyian, Clinton A Brawner, Jonathan K Ehrman, Di Zhao, Eliseo Guallar, Michael J Blaha, Erin D Michos
PURPOSE: Maximum predicted heart rate (MPHR) is traditionally calculated by (220-Age). However, this formula's validity has been questioned in women. The purpose of this study was to derive sex-specific formulas for MPHR in a clinical population, and compare their prognostic significance to the traditional formula. METHODS: This was a retrospective cohort of adults referred for exercise treadmill testing (ETT) between 1991 and 2009. Peak heart rate versus age was plotted by sex, and linear regression analysis was used to derive sex-specific MPHR formulas...
March 27, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28350712/effect-of-knee-joint-angle-and-contraction-intensity-on-hamstrings-coactivation
#20
Rui Wu, Eamonn Delahunt, Massimiliano Ditroilo, Madeleine Lowery, Giuseppe De Vito
PURPOSE: This study investigated the effect of knee joint angle and contraction intensity on the co-activation of the hamstring muscles (when acting as antagonists to the quadriceps) in young and older individuals of both sexes. METHODS: 25 young (24 ± 2.6 years) and 26 older (70 ± 2.5 years) healthy men and women participated. Maximal voluntary isometric contraction (MVIC) of the knee extensors (KE) and flexors was assessed at two knee joint angles (90° and 60°, 0° = full extension)...
March 27, 2017: Medicine and Science in Sports and Exercise
journal
journal
20196
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"