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Journal of Applied Physiology

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https://www.readbyqxmd.com/read/28935830/the-impact-of-artifact-correction-methods-of-rr-series-on-heart-rate-variability-parameters
#1
Anderson Ivan Rincon Soler, Luiz Eduardo Virgilio Silva, Rubens Fazan, Luiz Otavio Murta Junior
Heart rate variability (HRV) analysis is widely used to investigate the autonomic regulation of the cardiovascular system. HRV is often analyzed using RR time series, which can be affected by different types of artifacts. Although there are several artifact correction methods, there is no study that compares their performances in actual experimental contexts. This work aimed to evaluate the impact of different artifact correction methods on several HRV parameters. Initially, 36 ECG recordings of control rats or rats with heart failure or hypertension were analyzed to characterize artifacts occurrence rates and distributions, in order to be mimicked in simulations...
September 21, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28935829/contribution-of-structural-brain-phenotypes-to-the-variance-in-resting-energy-expenditure-in-healthy-caucasian-subjects
#2
Corinna Geisler, Mark Hübers, Oliver Granert, Manfred James Muller
BACKGROUND: Brain gray (GM) and white matter (WM) volumes are related to weight changes. The impact of structural variations in GM and WM on the variance in resting energy expenditure (REE) and the REE on fat free mass (FFM) association is unknown. The aim of this study was to address this in healthy Caucasian subjects. METHODS: Cross-sectional data analysis of 493 healthy Caucasian subjects (age range 6 to 80 years; three age groups) with comprehensive information on FFM, organ and tissue masses and detailed brain composition as assessed by whole body magnetic resonance imaging (MRI) and REE (assessed by indirect calorimetry)...
September 21, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28935828/daily-resistance-type-exercise-stimulates-overall-muscle-protein-synthesis-rates-in-vivo-in-young-males
#3
Andrew M Holwerda, Kevin J M Paulussen, Maarten Overkamp, Joey S J Smeets, Annemie P Gijsen, Joy P B Goessens, Lex B Verdijk, Luc J C van Loon
BACKGROUND: Resistance-type exercise increases muscle protein synthesis rates during acute post-exercise recovery. The impact of resistance-type exercise training on (local) muscle protein synthesis rates under free living conditions on a day-to-day basis remains unclear. OBJECTIVE: To determine the impact of daily unilateral resistance-type exercise on local myofibrillar protein synthesis rates during a three-day period. METHODS: Twelve healthy young males (22±1 y) were recruited to participate in this study where they performed daily, unilateral resistance-type exercise during a three-day intervention period...
September 21, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28935827/short-term-dietary-curcumin-supplementation-reduces-gastrointestinal-barrier-damage-and-physiological-strain-responses-during-exertional-heat-stress
#4
Mandy C Szymanski, Trevor L Gillum, Lacey M Gould, David S Morin, Matthew R Kuennen
PURPOSE: This work investigated the effect of 3d of 500mg/d dietary curcumin supplementation on gastrointestinal (GI) barrier damage and systems-physiology responses to exertional heat stress in non-heat acclimated humans. METHODS: Eight participants ran (65%VO2max) for 60min in a Darwin® chamber (37°C/25%RH) two times (Curcumin/Placebo). Intestinal fatty acid binding protein (I-FABP) and associated pro-inflammatory (MCP-1, TNFα, IL-6) and anti-inflammatory (IL-1RA, IL-10) cytokines were assayed from plasma collected before (Pre), after (Post), 1hr (1-Post), and 4hrs after (4-Post) exercise...
September 21, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28935826/immediate-effect-of-laryngeal-surface-electrical-stimulation-on-swallowing-performance
#5
Keizo Takahashi, Kazuhiro Hori, Hirokazu Hayashi, Masako Fujiu-Kurachi, Takahiro Ono, Takanori Tsujimura, Jin Magara, Makoto Inoue
Surface electrical stimulation of the laryngeal region is used to improve swallowing in dysphagic patients. However, little is known about how electrical stimulation affects tongue movements and related functions. We investigated the effect of electrical stimulation on tongue pressure and hyoid movement, as well as supra- and infrahyoid muscle activity, in 18 healthy young participants. Electrical stimulation (0.2 ms duration, 80 Hz, 80% of each participant's maximal tolerance) of the laryngeal region was applied...
September 21, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28935825/effect-of-tapering-after-a-period-of-high-volume-sprint-interval-training-on-running-performance-and-muscular-adaptations-in-moderately-trained-runners
#6
Casper Skovgaard, Nicki Winfield Almquist, Thue Kvorning, Peter Møller Christensen, Jens Bangsbo
The effect of tapering following a period of high-volume sprint interval training (SIT) and a basic volume of aerobic training on performance and muscle adaptations in moderately trained runners was examined. Eleven (8 males, 3 females) runners (maximum oxygen uptake (VO2-max): 56.8±2.9 mL·min(-1)·kg(-1); mean±SD) conducted high-volume SIT (HV; 20 SIT sessions; 8-12 x 30-s all-out) for 40 days followed by 18 days of tapering (TAP; 4 SIT sessions; 4 x 30-s all-out). Before and after HV as well as midway through and at the end of TAP, the subjects completed a 10-km running test and a repeated running test at 90% of vVO2-max to exhaustion (RRT)...
September 21, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28935824/effects-of-expiratory-muscle-activation-via-high-frequency-spinal-cord-stimulation
#7
Krzysztof E Kowalski, Jaroslaw Richard Romaniuk, Tomasz Kowalski, Anthony F DiMarco
In persons with spinal cord injury, lower thoracic low frequency spinal cord stimulation (LF-SCS, 50Hz,15mA) is a useful method to restore an effective cough. Unfortunately, the high stimulus amplitude requirements and potential activation of pain fibers significantly limits this application in persons with intact sensation. In this study, the mechanism of the expiratory muscle activation, via high frequency SCS (HF-SCS;500Hz,1mA) was evaluated in dogs. In group one, the effects of electrode placement on airway pressure generation (P) was evaluated...
September 21, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28935823/brachial-artery-vasodilatory-response-and-wall-shear-rate-determined-by-multi-gate-doppler-in-a-healthy-young-cohort
#8
Kunihiko Aizawa, Sara Sbragi, Alessandro Ramalli, Piero Tortoli, Francesco Casanova, Carmela Morizzo, Clare E Thorn, Angela C Shore, Phillip E Gates, Carlo Palombo
Wall shear rate (WSR) is an important stimulus for the brachial artery flow-mediated dilation (FMD) response. However, WSR estimation near the arterial wall by conventional Doppler is inherently difficult. To overcome this limitation, we utilised multi-gate Doppler to accurately determine the WSR stimulus near the vessel wall simultaneously with the FMD response using an integrated FMD system [Ultrasound Advanced Open Platform (ULA-OP)]. Using the system, we aimed to perform a detailed analysis of WSR-FMD response and establish novel WSR parameters in a healthy young population...
September 21, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28935822/effect-of-adipose-tissue-thickness-muscle-site-and-sex-on-near-infrared-spectroscopy-derived-total-hemoglobin-myoglobin
#9
Jesse C Craig, Ryan M Broxterman, Samuel L Wilcox, Chixiang Chen, Thomas J Barstow
Adipose tissue thickness (ATT) attenuates signals from near-infrared spectroscopy (NIRS) and diminishes the absolute quantification of underlying tissues by contemporary NIRS devices. Based on the relationship between NIRS-derived total-[Hemoglobin+Myoglobin] (total-[Hb+Mb]) and ATT, we tested the hypotheses that the correction factor for ATT: 1) is muscle site specific; 2) does not differ between men and women; and 3) exclusion of the shortest source-detector distance from data analysis increases total-[Hb+Mb]...
September 21, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28912362/sympathetic-function-during-whole-body-cooling-is-altered-in-hypertensive-adults
#10
Jody L Greaney, W Larry Kenney, Lacy M Alexander
During moderate cold exposure, cardiovascular-related morbidity and mortality increase disproportionately in hypertensive adults (HTN); however, the mechanisms underlying this association are not well defined. We hypothesized that whole-body cold stress would evoke exaggerated increases in blood pressure (BP) and muscle sympathetic nerve activity (MSNA) in HTN compared to normotensive adults (NTN) and that sympathetic baroreflex function would be altered during cooling in HTN. MSNA (peroneal microneurography) and beat-to-beat BP (Finometer) were measured continuously in 10 NTN (6M/4W; age 53±3 yrs; resting BP 125±3/79±1 mmHg) and 13 HTN (7M/6W; age 58±2 yrs; resting BP 146±5/88±2 mmHg) during whole-body cooling-induced reductions in mean skin temperature (Tsk; water-perfused suit) from 34...
September 14, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28912361/impact-of-sleep-restriction-on-local-immune-response-and-skin-barrier-restoration-with-and-without-multi-nutrient-nutrition-intervention
#11
Tracey J Smith, Marques A Wilson, J Philip Karl, Jeb Orr, Carl D Smith, Adam D Cooper, Kristin J Heaton, Andrew J Young, Scott J Montain
Systemic immune function is impaired by sleep restriction. However, the impact of sleep restriction on local immune responses, and to what extent any impairment can be mitigated by nutritional supplementation is unknown. We assessed the effect of 72-h sleep restriction (2-h nightly sleep) on local immune function and skin barrier restoration of an experimental wound, and determined the influence of habitual protein intake (1.5 g·kg(-1)·d(-1)) supplemented with arginine, glutamine, zinc sulfate, vitamin C, vitamin D3 and omega-3 fatty acids compared to lower protein intake (0...
September 14, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28912360/influence-of-past-injurious-exercise-on-fiber-type-specific-acute-anabolic-response-to-resistance-exercise-in-skeletal-muscle
#12
Ryo Takagi, Riki Ogasawara, Junya Takegaki, Arata Tsutaki, Koichi Nakazato, Naokata Ishii
We investigated influence of past injurious exercise on anabolic response of skeletal muscle fibers to resistance exercise (RE). Wistar rats were divided into exercise (E) and exercise after injury (I-E) groups. At age 10 wk, the right gastrocnemius muscle in each rat in the I-E group was subjected to strenuous eccentric contractions. Subsequently, RE was imposed on the same muscle of each rat at 14 wk of age in both groups. Peak joint torque and total force generation per body mass during RE were similar between the groups...
September 14, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28912359/left-ventricular-strain-rate-is-reduced-during-voluntary-apnea-in-healthy-humans
#13
Joshua R Smith, Shelbi L Sutterfield, Dryden R Baumfalk, Kaylin D Didier, Shane M Hammer, Jacob Troy Caldwell, Carl J Ade
During an apneic event, sympathetic nerve activity increases resulting in subsequent increases in left ventricular afterload and myocardial work. It is unknown how cardiac mechanics are acutely impacted by the increased myocardial work during an apneic event. 10 healthy individuals (23 ± 3 yrs) performed multiple voluntary end-expiratory apnea (VEEA) maneuvers exposed to room air, while a subset (n=7) completed multiple VEEA exposed to hyperoxic air (100% FiO2). Beat-by-beat blood pressure, heart rate and stroke volume were measured continuously...
September 14, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28883048/corp-ultrasound-assessment-of-vascular-function-with-the-passive-leg-movement-technique
#14
Jayson R Gifford, Russell S Richardson
As dysfunction of the vascular system is an early, modifiable step in the progression of many cardiovascular diseases, there is demand for methods to non-invasively monitor the health of the vascular system in clinical and research settings. Validated by very good agreement with more technical assessments of vascular function, like intra-arterial drug infusions and flow mediated dilation (FMD), the passive leg movement (PLM) technique has emerged as a powerful, yet relatively simple, test of peripheral vascular function...
September 7, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28883047/intrinsic-exercise-capacity-in-rats-influences-dopamine-neuroplasticity-induced-by-physical-training
#15
Patricia C R Rabelo, Nayara Abreu Coelho Horta, Letícia Maria Souza Cordeiro, Maristela O Poletini, Cândido Celso Coimbra, Raphael Escorsim Szawka, Danusa Dias Soares
The study evaluates whether the intrinsic capacity for physical exercise influences dopamine neuroplasticity induced by physical training. Male rats were submitted to 3 progressive tests until fatigue. Based on the maximal time of exercise (TE), rats were considered as low-performance (LP), standard-performance (SP) or high-performance (HP) to exercise. Eight animals from each group (LP, SP and HP) were randomly subdivided in sedentary (SED) or trained (TR). Physical training was performed during six weeks...
September 7, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28883046/case-studies-in-physiology-skeletal-muscle-mitochondrial-protein-synthesis-and-respiration-in-response-to-the-energetic-stress-of-an-ultra-endurance-race
#16
Adam R Konopka, William M Castor, Christopher A Wolff, Robert V Musci, Justin J Reid, Jaime L Laurin, Zackary J Valenti, Karyn L Hamilton, Benjamin F Miller
The 2016 Colorado Trail Race (CTR) was an ultra-endurance mountain bike race where competitors cycled for up to 24 hrs/day between altitudes of 1675 to 4025 meters to complete 800 kilometers and 21,000 meters of elevation gain. In one athlete, we had the unique opportunity to characterize skeletal muscle protein synthesis and mitochondrial respiration in response to a normal activity control period (CON) and the CTR. We hypothesized that mitochondrial protein synthesis would be elevated and mitochondrial respiration would be maintained during the extreme stresses of the CTR...
September 7, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28883045/breath-to-breath-variability-of-exhaled-co2-as-a-marker-of-lung-dysmaturity-in-infancy
#17
Sotirios Fouzas, Ilias Theodorakopoulos, Edgar Wilfried Delgado-Eckert, Philipp Latzin, Urs Frey
The concept of diffusional screening implies that breath-to-breath variations in CO2 clearance, when related to the variability of breathing, may contain information on the quality and utilization of the available alveolar surface. We explored the validity of the above hypothesis in a cohort of young infants of comparable post-menstrual age but born at different stages of lung maturity, namely, in term-born infants (N = 128), preterm-born infants without chronic lung disease of infancy (CLDI) (N = 53) and preterm infants with moderate/severe CLDI (N = 87)...
September 7, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28883044/beneficial-effects-of-exercise-training-in-heart-failure-are-lost-in-male-diabetic-rats
#18
Dalila Boudia, Valérie Domergue, Phlippe Mateo, Loubina Fazal, Mathilde Prud'homme, Heloise Prigent, Claude Delcayre, Alain Cohen-Solal, Anne Garnier, Renee Ventura-Clapier, Jane-Lise Samuel
Exercise training has been demonstrated to have beneficial effects in patients with heart failure (HF) or diabetes. However, it is unknown whether diabetic patients with HF will benefit from exercise training. Male Wistar rats were fed either a standard (Sham, n= 53) or high-fat, high-sucrose (HFHS) diet (D, n=66) for 6 months. After 2 months of diet, the rats were already diabetic. Rats were then randomly subjected to either myocardial infarction by coronary artery ligation (MI) or sham operation (Sham). Two months later, heart failure was documented by echocardiography and animals were randomly subjected to exercise training with treadmill for eight additional weeks or remained sedentary...
September 7, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28860177/effect-of-zileuton-on-osteoporotic-bone-and-its-healing-expression-of-bone-and-brain-genes-in-rats
#19
Dominik Saul, Milena Ninkovic, Marina Komrakova, Lorenz Wolff, Turab Gasimov, Björn Menger, Daniel Bernd Hoffmann, Veit Rohde, Stephan Sehmisch
Estrogen deficiency and aging are associated with osteoporosis, impaired bone healing and lower cognitive performance. Close functional and physical connections occur between bone and the central nervous system. An anti-inflammatory drug, zileuton, is known to have a positive effect on bone and ischemic brain. We studied the effect of zileuton on bone, its healing and on the genes for bone-brain cross-talks. Three-month-old Sprague-Dawley rats were ovariectomized or left untreated. After 8 weeks, bilateral metaphyseal tibia osteotomy with plate osteosynthesis was performed in all rats...
August 31, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28860176/shifting-gears-dynamic-muscle-shape-changes-and-force-velocity-behaviour-in-the-medial-gastrocnemius
#20
Taylor Jessica Marie Dick, James Michael Wakeling
When muscles contract, they bulge in thickness or in width to maintain a (nearly) constant volume. These dynamic shape changes are tightly linked to the internal constraints placed on individual muscle fibres and play a key functional role in modulating the mechanical performance of skeletal muscle by increasing its range of operating velocities. Yet to date, we have a limited understanding of the nature and functional implications of in vivo dynamic muscle shape change under submaximal conditions. This study determined how the in vivo changes in medial gastrocnemius (MG) fascicle velocity, pennation angle, muscle thickness and subsequent muscle gearing varied as a function of force and velocity...
August 31, 2017: Journal of Applied Physiology
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