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https://www.readbyqxmd.com/read/29330953/jaw-dropping-functional-variation-in-the-digastric-muscle-in-bats
#1
Abigail A Curtis, Sharlene E Santana
Diet and feeding behavior in mammals is strongly linked to the morphology of their feeding apparatus. Cranio-muscular morphology determines how wide, forcefully, and quickly the jaw can be opened or closed, which limits the size and material properties of the foods that a mammal can eat. Most studies of feeding performance in mammals have focused on skull form and jaw muscles involved in generating bite force, but few explore how jaw abduction is related to feeding performance. In this study, we explored how the morphology of the digastric muscle, the primary jaw abducting muscle in mammals, and its jaw lever mechanics are related to diet in morphologically diverse noctilionoid bats...
February 2018: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/29330952/jaw-muscle-fiber-architecture-and-leverage-in-the-hard-object-feeding-sooty-mangabey-are-not-structured-to-facilitate-relatively-large-bite-forces-compared-to-other-papionins
#2
Andrea B Taylor, Claire E Terhune, Maxx Toler, Megan Holmes, Callum F Ross, Christopher J Vinyard
Numerous studies have sought to link craniofacial morphology with behavioral ecology in primates. Extant hard-object feeders have been of particular interest because of their potential to inform our understanding about the diets of early fossil hominins. Sooty mangabeys (Cercocebus atys) are hard-object feeders that frequently generate what have been described as audibly powerful bites at wide jaw gapes to process materially stiff and hard seeds. We address the hypothesis that sooty mangabeys have features of the masticatory apparatus that facilitate this feeding behavior by comparing fiber architecture and leverage of the masseter and temporalis muscles between sooty mangabeys and three papionin primates that do not specialize on hard objects...
February 2018: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/29330950/comparative-anatomy-of-bat-jaw-musculature-via-diffusible-iodine-based-contrast-enhanced-computed-tomography
#3
Sharlene E Santana
Noctilionoid bats exhibit an extraordinary array of cranial specializations that match diverse diets, including variation in jaw musculature physiological cross-sectional areas (PCSA), lever arms, and relative contribution to bite force. Although previous research in this group has linked variation in skull shape and muscle mechanics to biting performance, there are still important gaps about the anatomical underpinnings of noctilionoid dietary adaptations, including the degree of compartmentalization of the jaw musculature, and whether and how muscle attachment sites have evolved across noctilionoid species that specialize on derived diets...
February 2018: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/29330669/hip-and-groin-injuries-in-baseball-players
#4
REVIEW
Ryan A Mlynarek, Struan H Coleman
PURPOSE OF REVIEW: To discuss the clinical significance of the most common hip and groin injuries in baseball players, as well as an algorithmic approach to diagnosis and treatment of these injuries. RECENT FINDINGS: (a) Limitations in throwing velocity, pitch control, and bat swing speed may be secondary to decreased mobility and strength within the proximal kinetic chain, which must harness power from the lower extremities and core. (b) Approximately 5.5% of all baseball injuries per year involve the hip/groin and may lead to a significant amount of time spent on the disabled list...
January 12, 2018: Current Reviews in Musculoskeletal Medicine
https://www.readbyqxmd.com/read/29329344/maintenance-of-muscle-strength-retains-a-normal-metabolic-cost-in-simulated-walking-after-transtibial-limb-loss
#5
Elizabeth Russell Esposito, Ross H Miller
Recent studies on relatively young and fit individuals with limb loss suggest that maintaining muscle strength after limb loss may mitigate the high metabolic cost of walking typically seen in the larger general limb loss population. However, these data are cross-sectional and the muscle strength prior to limb loss is unknown, and it is therefore difficult to draw causal inferences on changes in strength and gait energetics. Here we used musculoskeletal modeling and optimal control simulations to perform a longitudinal study (25 virtual "subjects") of the metabolic cost of walking pre- and post-limb loss (unilateral transtibial)...
2018: PloS One
https://www.readbyqxmd.com/read/29326905/neuromuscular-features-in-sprinters-with-cerebral-palsy-case-studies-based-on-paralympic-classification
#6
Diego Antunes, Mateus Rossato, Rafael Lima Kons, Raphael Luiz Sakugawa, Gabriela Fischer
Despite the evolution of runner performance in athletes with cerebral palsy (CP), little is known about neuromuscular parameters of sprinters from different classes, especially related to power output, muscular imbalances and asymmetry indexes in lower limbs. The aim of this study was to assess muscle power, muscular imbalance and asymmetry in sprinters with CP. Four male sprinters with CP (age, 18 to 27 years; body mass, 58.5 to 72.8 kg; height, 161.5 to 174 cm) classified as T38, T37, T36, T35 according to International Paralympic Committee functional classification, performed vertical counter movement jump and squat jump on force plate and isokinetic torque evaluations in both limbs...
December 2017: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/29324474/active-and-inactive-leg-hemodynamics-during-sequential-single-leg-interval-cycling
#7
Nicole Gordon, Chris R Abbiss, Mohammed Ihsan, Andrew J Maiorana, Jeremiah J Peiffer
INTRODUCTION: Leg order during sequential single-leg cycling (i.e. exercising both legs independently within a single session) may affect local muscular responses potentially influencing adaptations. This study examined the cardiovascular and skeletal muscle hemodynamic responses during double-leg and sequential single-leg cycling. METHODS: Ten young healthy adults (28 ± 6 y) completed six 1-min double-leg intervals interspersed with one minute of passive recovery and, on a separate occasion, 12 (six with one leg followed by six with the other leg) 1-min single-leg intervals interspersed with one minute of passive recovery...
January 11, 2018: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29322310/relationship-between-sagittal-spinal-curves-geometry-and-isokinetic-trunk-muscle-strength-in-adults
#8
Walaa Elsayed, Ahmed Farrag, Qassim Muaidi, Nora Almulhim
PURPOSE: Sagittal spinal deviation has been reported to be a significant musculoskeletal problem affecting both genders and could develop at any age. Factors triggering this issue are still not well defined. The purpose of this study was to investigate the relationship between sagittal spine angles and isokinetic peak, average torque, and power of trunk muscles in asymptomatic adults. METHODS: A convenient sample of 79 subjects with asymptomatic spine participated in this study...
January 10, 2018: European Spine Journal
https://www.readbyqxmd.com/read/29322201/characterization-of-corticospinal-activation-of-finger-motor-neurons-during-precision-and-power-grip-in-humans
#9
Christian Svane, Christian Riis Forman, Jens Bo Nielsen, Svend Sparre Geertsen
Direct and indirect corticospinal pathways to finger muscles may play a different role in control of the upper extremity. We used transcranial magnetic stimulation (TMS) and coherence analysis to characterize the corticospinal drive to the first dorsal interosseous (FDI) and abductor pollicis brevis (APB) when active during a precision and power grip task. In experiment 1, single motor units were recorded during precision grip and power grip in 20 adults (25.2 ± 7.1 years). Post-stimulus time histograms (PSTH) were obtained following TMS...
January 10, 2018: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/29318756/loss-of-skeletal-muscle-during-systemic-chemotherapy-is-prognostic-of-poor-survival-in-patients-with-foregut-cancer
#10
Louise E Daly, Éadaoin B Ní Bhuachalla, Derek G Power, Samantha J Cushen, Karl James, Aoife M Ryan
BACKGROUND: Malnutrition, weight loss, and muscle wasting are common in patients with foregut cancers (oesophagus, stomach, pancreas, liver, and bile ducts) and are associated with adverse clinical outcomes. However, little is known about the changes in body composition that occur in these patients during chemotherapy and its impacts clinical outcomes. PATIENTS AND METHODS: A prospective study of adult foregut cancer patients undergoing chemotherapy between 2012 and 2016 was conducted...
January 9, 2018: Journal of Cachexia, Sarcopenia and Muscle
https://www.readbyqxmd.com/read/29318168/the-utility-of-objective-strength-and-functional-performance-to-predict-subjective-outcomes-after-anterior-cruciate-ligament-reconstruction
#11
Heather Menzer, Lindsay V Slater, David Diduch, Mark Miller, Grant Norte, John Goetschius, Joseph M Hart
Background: Many clinicians release patients to return to activity after anterior cruciate ligament reconstruction (ACLR) based on time from surgery despite deficits in muscle strength and function. It is unclear whether symmetry or unilateral performance is the best predictor of subjective outcomes after ACLR. Purpose: To determine physical performance predictors of patient-reported outcomes after reconstruction. Study Design: Cross-sectional study; Level of evidence, 3...
December 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29318030/environmental-temperature-and-exercise-modality-independently-impact-central-and-muscle-fatigue-among-people-with-multiple-sclerosis
#12
Geetika Grover, Michelle Ploughman, Devin T Philpott, Liam P Kelly, Augustine J Devasahayam, Katie Wadden, Kevin E Power, Duane C Button
Background: Heat sensitivity and fatigue limit the ability of multiple sclerosis patients to participate in exercise. Objective: The purpose of this study was to determine the optimal aerobic exercise parameters (environmental temperature and exercise modality) to limit exercise-induced central and muscle fatigue among people with multiple sclerosis. Methods: Fourteen people with multiple sclerosis with varying levels of disability completed four randomized exercise sessions at 65% of the maximal volume of oxygen: body-weight supported treadmill cool (16°C), body-weight supported treadmill room (21°C), total-body recumbent stepper cool and total-body recumbent stepper room...
October 2017: Multiple Sclerosis Journal—Experimental, Translational and Clinical
https://www.readbyqxmd.com/read/29317401/acute-and-chronic-increases-of-circulating-fstl1-normalize-energy-substrate-metabolism-in-pacing-induced-heart-failure
#13
Mitsuru Seki, Jeffery C Powers, Sonomi Maruyama, Maria A Zuriaga, Chia-Ling Wu, Clara Kurishima, Lydia Kim, Jesse Johnson, Anthony Poidomani, Tao Wang, Eric Muñoz, Sudarsan Rajan, Joon Y Park, Kenneth Walsh, Fabio A Recchia
BACKGROUND: FSTL1 (follistatin-like protein 1) is an emerging cardiokine/myokine that is upregulated in heart failure (HF) and is found to be cardioprotective in animal models of cardiac injury. We tested the hypothesis that circulating FSTL1 can affect cardiac function and metabolism under baseline physiological conditions and in HF. METHODS AND RESULTS: FSTL1 was acutely (10 minutes) or chronically (2 weeks) infused to attain clinically relevant blood levels in conscious dogs with cardiac tachypacing-induced HF...
January 2018: Circulation. Heart Failure
https://www.readbyqxmd.com/read/29317222/do-performance-measures-of-strength-balance-and-mobility-predict-quality-of-life-and-community-reintegration-after-stroke
#14
Joshua W Cohen, Tanya D Ivanova, Brenda Brouwer, Kimberly J Miller, Dianne Bryant, S Jayne Garland
OBJECTIVE: To investigate the extent to which physical performance measures of strength, balance and mobility taken at discharge from inpatient stroke rehabilitation can predict health-related quality of life (HRQoL) and community reintegration after 6 months. DESIGN: Longitudinal Study SETTING: University Laboratory PARTICIPANTS: Seventy-five adults recruited within one month following discharge home from inpatient stroke rehabilitation. Inclusion criteria were: major unilateral hemispheric stroke, English speaking, able to communicate, discharged home...
January 6, 2018: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/29315586/dietary-enzymatically-treated-artemisia-annua-l-improves-meat-quality-antioxidant-capacity-and-energy-status-of-breast-muscle-in-heat-stressed-broilers
#15
Xiaoli Wan, Hussain Ahmad, Lili Zhang, Zhiyue Wang, Tian Wang
BACKGROUND: Heat stress (HS) is detrimental to animal origin food production. Artemisia annua L., a natural source of phenolic compounds and flavonoids, exhibits antioxidant property. This study was conducted to evaluate the effects of dietary enzymatically treated Artemisia annua L. (EA) supplementation on meat quality, antioxidant capacity and energy status of breast muscle in heat-stressed broilers. RESULTS: The EA inclusion increased the redness value, reduced drip loss, decreased reactive oxygen metabolites and thiobarbituric acid-reactive substances, increased antioxidant enzyme activities, and reduced the ferric reducing antioxidant power and free radical scavenging abilities of breast muscle in heat-treated broilers...
January 9, 2018: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/29315169/health-benefits-of-an-innovative-exercise-program-for-mitochondrial-disorders
#16
Carmen Fiuza-Luces, Jorge Díez-Bermejo, Miguel Fernández-de la Torre, Gabriel Rodríguez-Romo, Paz Sanz-Ayán, Aitor Delmiro, Diego Munguía-Izquierdo, Irene Rodríguez-Gómez, Ignacio Ara, Cristina Domínguez-González, Joaquín Arenas, Miguel A Martín, Alejandro Lucia, María Morán
PURPOSE: We determined the effects of an innovative 8-week exercise intervention (aerobic, resistance and inspiratory muscle training) for patients with mitochondrial disease (MD). METHODS: Several endpoints were assessed in 12 patients (19-59 years, 4 female) at pre-training, post-training and after 4-week detraining: aerobic power, muscle strength/power and maximal inspiratory pressure (main endpoints), ability to perform activities of daily living (ADL), body composition, quality of life and blood myokines (secondary endpoints)...
January 8, 2018: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29315165/exercise-thresholds-on-trial-are-they-really-equivalent
#17
Kevin Caen, Kobe Vermeire, Jan G Bourgois, Jan Boone
PURPOSE: The interchangeable use of whole-body exercise thresholds and breakpoints (BPs) in the local oxygenation response, as measured via near-infrared spectroscopy (NIRS), has recently been questioned in scientific literature. Therefore, the present study aimed to longitudinally investigate the interrelationship of four commonly used exercise thresholds: critical power (CP), the respiratory compensation point (RCP) and BPs in muscle (m[HHb]BP) and brain (c[O2Hb]BP) oxygenation. METHODS: Nine male participants (21...
January 8, 2018: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29314903/national-athletic-trainers-association-position-statement-prevention-of-anterior-cruciate-ligament-injury
#18
Darin A Padua, Lindsay J DiStefano, Timothy E Hewett, William E Garrett, Stephen W Marshall, Grace M Golden, Sandra J Shultz, Susan M Sigward
OBJECTIVE:   To provide certified athletic trainers, physicians, and other health care and fitness professionals with recommendations based on current evidence regarding the prevention of noncontact and indirect-contact anterior cruciate ligament (ACL) injuries in athletes and physically active individuals. BACKGROUND:   Preventing ACL injuries during sport and physical activity may dramatically decrease medical costs and long-term disability. Implementing ACL injury-prevention training programs may improve an individual's neuromuscular control and lower extremity biomechanics and thereby reduce the risk of injury...
January 9, 2018: Journal of Athletic Training
https://www.readbyqxmd.com/read/29314071/sarcolemmal-excitability-changes-in-normal-human-aging
#19
James Hf Lee, Robert Boland-Freitas, Karl Ng
INTRODUCTION: The exact mechanisms underlying the loss of skeletal muscle bulk and power with normal human aging are not well established. Muscle velocity recovery cycles (MVRC) is an in vivo neurophysiological technique which we employed to assess the impact of age on sarcolemmal excitability. METHODS: MVRC recordings were obtained from tibialis anterior (n=74) and rectus femoris (n=32) muscles from 74 healthy subjects (18-84 years, median age 35, interquartile range 29-55) Results: Increasing age was linearly associated with longer muscle relative refractory period (MRRP) and reduced early supernormality (ESN) in both tibialis anterior (MRRP: r2 =0...
January 4, 2018: Muscle & Nerve
https://www.readbyqxmd.com/read/29311764/effects-of-beetroot-juice-supplementation-on-intermittent-high-intensity-exercise-efforts
#20
REVIEW
Raúl Domínguez, José Luis Maté-Muñoz, Eduardo Cuenca, Pablo García-Fernández, Fernando Mata-Ordoñez, María Carmen Lozano-Estevan, Pablo Veiga-Herreros, Sandro Fernandes da Silva, Manuel Vicente Garnacho-Castaño
Beetroot juice contains high levels of inorganic nitrate (NO3-) and its intake has proved effective at increasing blood nitric oxide (NO) concentrations. Given the effects of NO in promoting vasodilation and blood flow with beneficial impacts on muscle contraction, several studies have detected an ergogenic effect of beetroot juice supplementation on exercise efforts with high oxidative energy metabolism demands. However, only a scarce yet growing number of investigations have sought to assess the effects of this supplement on performance at high-intensity exercise...
2018: Journal of the International Society of Sports Nutrition
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