Metabolic-Cost Comparison of Running on an Aquatic Treadmill With Water-Jets and Land Treadmill With Incline

Purpose: This study investigated whether running on a land treadmill (TM) at specific inclines corresponded to an equivalent metabolic cost (MC, oxygen consumption, VO2) using water-jets on an aquatic treadmill (ATM) at equivalent running speeds. Methods: Sixteen participants completed two trials on separate days on a TM and ATM. For each trial subjects performed eighteen, 3-4 min submaximal runs at three self selected speeds (slow, medium, and fast) with either water-jet resistances of 0-100% of maximum jet flow capacity in 20% increments during ATM or inclines of 0-10% in 2% increments during TM. Trials were separated by at least 48 hours. Oxygen consumption (VO2), heart rate (HR), and rating of perceived exertion (RPE) were recorded during each trial. Regression and 2x6 ANOVA analysis was employed to evaluate TM and ATM running speed x jet resistance/incline relationship. Results: When running at similar speeds with no resistance (jets or incline), ATM yielded lower VO2 than TM. Adding 40% jets during ATM matched MC during TM at 0% incline. At 60% jets ATM MC simulated TM MC while running on a 4% incline. Comparable MC was observed during ATM 80% jets and 8% TM incline, while ATM 100% jets yielded greater MC than TM 10% incline. While TM yields a linear increase in MC with increasing incline, ATM yielded a non-linear, cubic, in MC with increased jet resistance. Conclusion: The relationship between MC and resistance settings in ATM is quite different than TM incline and may be a result of non-linear application of drag forces on the torso created by the water velocities of the water jets

Radiative cooling in collisionally and photo ionized plasmas

We discuss recent improvements in the calculation of the radiative cooling in both collisionally and photo ionized plasmas. We are extending the spectral simulation code Cloudy so that as much as possible of the underlying atomic data is taken from external databases, some created by others, some developed by the Cloudy team. This paper focuses on recent changes in the treatment of many stages of ionization of iron, and discusses its extensions to other elements. The H-like and He-like ions are treated in the iso-electronic approach described previously. Fe II is a special case treated with a large model atom. Here we focus on Fe III through Fe XXIV, ions which are important contributors to the radiative cooling of hot, 1e5 to 1e7 K, plasmas and for X-ray spectroscopy. We use the Chianti atomic database to greatly expand the number of transitions in the cooling function. Chianti only includes lines that have atomic data computed by sophisticated methods. This limits the line list to lower excitation, longer wavelength, transitions. We had previously included lines from the Opacity Project database, which tends to include higher energy, shorter wavelength, transitions. These were combined with various forms of the g-bar approximation, a highly approximate method of estimating collision rates. For several iron ions the two databases are almost entirely complementary. We adopt a hybrid approach in which we use Chianti where possible, supplemented by lines from the Opacity Project for shorter wavelength transitions. The total cooling including the lightest thirty elements differs significantly from some previous calculations

Motivation profiles in sport: A self-determination theory perspective

The present study examined the link between motivation profiles among adult sports participants and the outcomes of enjoyment, effort, positive and negative affect, attitude toward sport participation, intention to continue sport participation, satisfaction, and persistence in sport. Two samples of participants (n = 590 and n = 555) completed the Sport Motivation Scale and a range of self-report measures to assess the outcome variables. Exploratory cluster analyses applied to Sample 1 and confirmatory cluster analysis applied to Sample 2 identified two clusters of sport participants. The first comprised participants with high scores on both non self-determined and self-determined motives. The second comprised participants with high scores on self-determined motives but low scores on non self- determined motives. Participants in the first cluster scored higher on all outcome variables. The results are discussed with reference to a more in-depth understanding of the motivation dynamics of sport participation based on Self-Determination Theory

Vortex Lattice Locking in Rotating Two-Component Bose-Einstein Condensates

The vortex density of a rotating superfluid, divided by its particle mass, dictates the superfluid's angular velocity through the Feynman relation. To find how the Feynman relation applies to superfluid mixtures, we investigate a rotating two-component Bose-Einstein condensate, composed of bosons with different masses. We find that in the case of sufficiently strong interspecies attraction, the vortex lattices of the two condensates lock and rotate at the drive frequency, while the superfluids themselves rotate at two different velocities, whose ratio is the ratio between the particle mass of the two species. In this paper, we characterize the vortex-locked state, establish its regime of stability, and find that it surives within a disk smaller than a critical radius, beyond which vortices become unbound, and the two Bose-gas rings rotate together at the frequency of the external drive.Comment: 6 pages, 2 figure

Effects of Moderate Sleep Restriction During 8-week Calorie Restriction on Lipoprotein Particles and Glucose Metabolism

Study Objectives This study examined how glucose, glucose regulatory hormones, insulin sensitivity, and lipoprotein subclass particle concentrations and sizes change with sleep restriction during weight loss elicited by calorie restriction. Methods Overweight or obese adults were randomized into an 8-week calorie restriction intervention alone (CR, n = 12; 75% female; body mass index = 31.4 ± 2.9 kg/m2) or combined with sleep restriction (CR+SR, n = 16; 75% female; body mass index = 34.5 ± 3.1 kg/m2). Participants in both groups were given the same instructions to reduce calorie intake. Those in the CR+SR group were instructed to reduce their habitual time-in-bed by 30–90 minutes 5 days each week with 2 ad libitum sleep days. Fasting venous blood samples were collected at pre- and post-intervention. Results Differential changes were found between the two groups (p = 0.028 for group × time interaction) in glucagon concentration, which decreased in the CR group (p = 0.016) but did not change in CR+SR group. Although changes in mean HDL particle (HDL-P) size and visfatin concentration were not statistically different between groups (p = 0.066 and 0.066 for group×time interaction, respectively), mean HDL-P size decreased only in the CR+SR group (Cohen’s d = 0.50, p = 0.022); visfatin concentrations did not change significantly in either group but appeared to decrease in the CR group (Cohen’s d = 0.67, p = 0.170) but not in the CR+SR group (Cohen’s d = 0.43, p = 0.225). Conclusion These results suggest that moderate sleep restriction, despite the presence of periodic ad libitum sleep, influences lipoprotein subclass particles and glucose regulation in individuals undergoing calorie restriction. Clinical trial registration: ClinicalTrials.gov (NCT02413866, Weight Outlooks by Restriction of Diet and Sleep

Pulmonary effects of inhalation of spark-generated silver nanoparticles in Brown-Norway and Sprague-Dawley rats

The increasing use of silver nanoparticles (AgNPs) in consumer products is concerning. We examined the potential toxic effects when inhaled in Brown-Norway (BN) rats with a pre-inflammatory state compared to Sprague-Dawley (SD) rats.We determined the effect of AgNPs generated from a spark generator (mass concentration: 600-800 μg/mm(3); mean diameter: 13-16 nm; total lung doses: 8 [Low] and 26-28 [High] μg) inhaled by the nasal route in both rat strains. Rats were sacrificed at day 1 and day 7 after exposure and measurement of lung function.In both strains, there was an increase in neutrophils in bronchoalveolar lavage (BAL) fluid at 24 h at the high dose, with concomitant eosinophilia in BN rats. While BAL inflammatory cells were mostly normalised by Day 7, lung inflammation scores remained increased although not the tissue eosinophil scores. Total protein levels were elevated at both lung doses in both strains. There was an increase in BAL IL-1β, KC, IL-17, CCL2 and CCL3 levels in both strains at Day 1, mostly at high dose. Phospholipid levels were increased at the high dose in SD rats at Day 1 and 7, while in BN rats, this was only seen at Day 1; surfactant protein D levels decreased at day 7 at the high dose in SD rats, but was increased at Day 1 at the low dose in BN rats. There was a transient increase in central airway resistance and in tissue elastance in BN rats at Day 1 but not in SD rats. Positive silver-staining was seen particularly in lung tissue macrophages in a dose and time-dependent response in both strains, maximal by day 7. Lung silver levels were relatively higher in BN rat and present at day 7 in both strains.Presence of cellular inflammation and increasing silver-positive macrophages in lungs at day 7, associated with significant levels of lung silver indicate that lung toxicity is persistent even with the absence of airway luminal inflammation at that time-point. The higher levels and persistence of lung silver in BN rats may be due to the pre-existing inflammatory state of the lungs

Radiative Cooling in Collisionally Ionized and Photoionized Plasmas

We discuss recent improvements in the calculation of the radiative cooling in both collisionally ionized and photoionized plasmas. We are extending the spectral simulation code CLOUDY so that as much as possible of the underlying atomic data are taken from external data bases, some created by others and some developed by the CLOUDY team. This paper focuses on recent changes in the treatment of many stages of ionization of iron, and discusses its extensions to other elements. The H- and He-like ions are treated in the isoelectronic approach described previously. Fe II is a special case treated with a large model atom. Here we focus on Fe III through Fe XXIV, ions which are important contributors to the radiative cooling of hot (T ∼ 105–107 K) plasmas and for X-ray spectroscopy. We use the Chianti atomic data base to greatly expand the number of transitions in the cooling function. Chianti only includes lines that have atomic data computed by sophisticated methods. This limits the line list to lower excitation, longer wavelength, transitions. We had previously included lines from the Opacity Project data base, which tends to include higher energy, shorter wavelength, transitions. These were combined with various forms of the ‘g-bar’ approximation, a highly approximate method of estimating collision rates. For several iron ions the two data bases are almost entirely complementary. We adopt a hybrid approach in which we use Chianti where possible, supplemented by lines from the Opacity Project for shorter wavelength transitions. The total cooling including the lightest 30 elements differs from some previous calculations by significant amounts

The Relationship between Dietary Intake and Sleep Quality in Endurance Athletes

Athletes have a high prevalence of poor sleep quality. It is unknown if dietary intake affects sleep quality in athletes. PURPOSE: To examine if sleep quality in endurance athletes is related to dietary intake. METHODS: Endurance athletes (n=187), 42.0±13.7 y, participated in the study. Participants completed questionnaires on demographics, dietary intake, and sleep quality. Sleep quality was assessed using the Athlete Sleep Screening Questionnaire (ASSQ), a validated tool, with scores ranging from 0-40 (higher scores indicate poorer sleep quality). The ASSQ subscales included sleep difficulty (SD), chronotype (C), and sleep disordered breathing (SDB). ASSQ-SD was categorized as having none (0-4), mild (5-7), moderate (8-10), and severe (11-17) SD. ASSQ-C was categorized as morning (\u3e4) or evening (higher risk for sleep issues) (≤4) type. ASSQ-SDB was categorized as difficulty breathing (\u3e1) or not ( RESULTS: ASSQ score was 22.3±3.96, indicating average sleep quality among athletes. ASSQ-SD score showed that 33.7% of athletes had no SD, and 38.5%, 21.9%, and 5.9% had mild, moderate, and severe SD, respectively. ASSQ-C score was 9.4±2.82, and 93% of athletes were morning type and 7% were evening type. ASSQ-SDB score indicated that 79.1% of athletes had normal and 20.9% had disordered breathing. Preliminary analyses revealed that ASSQ scores were significantly related to vegetable (p=.038) and caffeinated beverage (p=0.034) intake, but not to the other dietary variables. Significantly higher ASSQ score, (i.e., poorer sleep quality) was found in athletes who consumed ≥5 servings/d (24.0±4.0) of vegetables compared with \u3c1 \u3e(20.9±3.18, p=.011) or 1-2 (21.6±4.11, p=.030) servings/d. Athletes who drank \u3e2.5 cups/d of caffeinated beverages had higher ASSQ score or poorer sleep quality versus those who consumed 3 cups/d of milk had a higher disordered breathing score (.69±.947) versus those who drank 1-2 (.18±.521, p=.009) and \u3c1 \u3e(.30±.641, p=.016) cups/d. Athletes who consumed /d of whole grains had a higher ASSQ-DBS score (.48±.79) versus those who consumed 3-4 servings/d (.09±.401, p=.029). ASSQ-SD was not related to any of the dietary variables. CONCLUSIONS: Increased vegetable and caffeinated beverage consumption were associated with decreased sleep quality. Less whole grains and fruits were associated with evening chronotype. Athletes who consumed more milk and less whole grains had increased disordered breathing

Physical Activity Behavior in Persons with Parkinson’s Disease

Parkinson’s Disease (PD) is the second most common neurological disorder affecting the musculoskeletal function, respiratory function, and laryngeal function. Despite these dysfunctions, persons with PD (PwPD)are still able to positively adapt to exercise training. PURPOSE: The purpose of this study is to investigate changes in physical activity (PA) in PwPD that participate in a long-term boxing training program designed for PwPD. This is a 1-month, preliminary analysis of a larger 12-month longitudinal pilot study. METHODS: Each participant (n=6) will complete a total of 104, 1-hour boxing training session, over the course of 12 months. Prior to participation in the training program and at five timepoints during training (1, 2, 3, 6, and 12 months), participants will complete a self-report survey related to PA behavior (International Physical Activity Questionnaire; IPAQ). This preliminary report is a description of PA changes between baseline and 1-month of intervention. RESULTS: One participant had to discontinue participation in the boxing program so results are based on n=5. Vigorous intensity PA activity increased in 2 participants and decreased in 3 participants resulting in an average of -19 minutes of vigorous PA/person/week. Moderate intensity PA activity increased in 3 participants and decreased in 2 participants resulting in an average of +28 minutes of moderate intensity PA/person/week. Walking time increased in 3 participants and decreased in 2 participants resulting in +14 minutes of walking time/person/week. Sitting time increased in 2 participants and decreased in 3 participants resulting in -25 minutes of sitting time/person/week. CONCLUSION: While data collection for this study is preliminary, promising trends of improved PA behavior (increased PA minutes and decreased sitting minutes) are encouraging. If trends of improved PA behavior are realized over the entirety of this study (12 months), we expect to see other positive neurological outcomes that are also being analyzed in these study participants