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IDDOI:10.21203/rs.3.rs-28580/v1Published Date2020-05-13
Abstract Despite calls in the literature, little is known about how dimensions of a social and task nature relate to each other in school and out-of-school learning environments. This study explored whether interpersonal and task dimensions of the youth sport environment, as perceived by young people, are related, and, if so, how they are related. We used data from 310 adolescent sport participants from eastern Canada (Mage = 14.69 ± 1.60 years; 54.8 % girls). Participants completed comprehen…
Publication
ID31997349Published Date2020-05-01JournalThe Journal of animal ecology, 2020-05-01, Volume 89
Understanding the determinants of reproduction is a central question in evolutionary ecology. In pulsed-resource environments, the reproduction and population dynamics of seed consumers are driven by pulsed production of seeds by trees or mast-seeding. In Southern Québec, eastern chipmunks Tamias striatus exclusively reproduce during the summer before and the spring after a mast-seeding event of American beech. They thus seem to anticipate beech mast by reproducing during early summer, so tha…
Publication
ID32286335Published Date2020-04-14JournalScientific data, 2020-04-14, Volume 7
A comprehensive database of paleoclimate records is needed to place recent warming into the longer-term context of natural climate variability. We present a global compilation of quality-controlled, published, temperature-sensitive proxy records extending back 12,000 years through the Holocene. Data were compiled from 679 sites where time series cover at least 4000 years, are resolved at sub-millennial scale (median spacing of 400 years or finer) and have at least one age control point every …
Publication
ID32114076Published Date2020-02-28JournalExperimental gerontology, 2020-02-28, Volume 134
Multiple types of exercise interventions have been described as effective methods for improving cognition and mobility in older adults. In addition to combined strength and aerobic training, gross motor activities have shown benefits. However, adherence to exercise is a challenge, which may bring about periods of training cessation. Importantly, short-term training cessation may lead to a loss of fitness adaptations. The effects of training cessation on cognition and functional capacity are n…
Publication
ID32107558Published Date2020-02-28JournalThe journals of gerontology. Series B, Psychological sciences and social sciences, 2020-02-28
A common finding in the mind-wandering literature is that older adults (OAs) tend to mind-wander less frequently than young adults (YAs). Here, we sought to determine whether this age-related difference in mind-wandering is attributable to age-related differences in motivation.YAs and OAs completed an attention task during which they responded to thought probes that assessed rates of mind-wandering, and they provided self-reports of task-based motivation before and after completion of the att…
Publication
ID32098221Published Date2020-02-21JournalInternational journal of environmental research and public health, 2020-02-21, Volume 17
: Many studies have reported that regular physical activity is positively associated with cognitive performance and more selectively with executive functions. However, some studies reported that the association of physical activity on executive performance in younger adults was not as clearly established when compared to studies with older adults. Among the many physiological mechanisms that may influence cognitive functioning, prefrontal (PFC) oxygenation seems to play a major role. The aim …
Publication
ID31837344Published Date2020-02-17JournalBehavioural brain research, 2020-02-17, Volume 380
This study aimed to evaluate the effects of cardiorespiratory fitness (CRF) and mean arterial pressure (MAP) on the prefrontal cortex (PFC) oxygenation and dual-task performance in healthy young males. Changes in the concentration of oxygenated (ΔHbO) and deoxygenated hemoglobin (ΔHHb) in the right and left PFC were examined during a cognitive auditory 2-back task. Cognitive performance (2-back task's accuracy) and walking motor performances were measured in single-tasks (single motor and sin…
Publication
IDarXiv:2001.09476Published Date2020-01-26
The dynamical production of low-mass X-ray binaries and brighter cataclysmic variables (CVs) in dense globular clusters is well-established. We investigate how the X-ray emissivity of fainter X-ray binaries (principally CVs and coronally active binaries) varies between different environments. We compile calculations (largely from the literature) of the X-ray emissivity of old stellar populations, including open and globular clusters and several galaxies. We investigate three literature claims…
Publication
IDarXiv:2001.09533Published Date2020-01-26JournalPhys. Rev. Research, 2020-01-26, Volume 2
An equation describing a one-dimensional model for the freezing of lakes is shown to be formally analogous to the Friedmann equation of cosmology. The analogy is developed and used to speculate on the change between two hypothetical "spacetime phases" in the early universe.
Publication
IDarXiv:2001.02126Published Date2020-01-07
We report a symmetry property of the Einstein-Friedmann equations for spatially flat Friedmann-Lema\^itre-Robertson-Walker universes filled with a perfect fluid with any constant equation of state. The symmetry transformations form a one-parameter Abelian group.
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