Factors contributing to the low physical activity level for Hong Kong Chinese children hospitalised with cancer: an exploratory study

© 2016 John Wiley & Sons Ltd Aims and objectives: To explore the factors contributing to the low physical activity level for Hong Kong Chinese children hospitalised with cancer. Background: Notwithstanding the fact that regular physical activity can ameliorate cancer-related fatigue and other adverse effect of cancer treatment on children's physical and psychological well-being, physical inactivity is a common problem among children undergoing cancer treatment. Understanding the factors that affect their physical activity level is an important step towards planning and evaluating an appropriate intervention that promotes the adoption and maintenance of regular physical activity. Design: A phenomenological design was used in this qualitative study. Methods: A purposive sample of 25 children with cancer was recruited in a paediatric oncology unit of an acute care public hospital in Hong Kong. They were asked to participate in a semistructured interview by their bedside lasting about 30 minutes. All the interviews were tape-recorded and immediately transcribed. Content analysis was used to analyse the qualitative data. Results: The findings revealed that the patientsâ physical condition, misunderstanding about physical activity by children, parents and healthcare professionals, emotional disturbances and social influences are four important factors impeding children from engaging in regular physical activity during cancer treatment. Conclusion: This study addresses a gap in the literature by identifying the factors that negatively influence the physical activity levels of Hong Kong Chinese children hospitalised with cancer. Relevance to clinical practice: Understanding these factors, nurses can explore interventions that target on correcting the misunderstanding and providing relevant information about the importance of physical activity, eventually promoting the adoption and maintenance of regular physical activity and enhancing the quality of life.Link_to_subscribed_fulltex

Search for gravitational waves from Scorpius X-1 with a hidden Markov model in O3 LIGO data

Results are presented for a semicoherent search for continuous gravitational waves from the low-mass x-ray binary Scorpius X-1, using a hidden Markov model (HMM) to allow for spin wandering. This search improves on previous HMM-based searches of Laser Interferometer Gravitational-Wave Observatory data by including the orbital period in the search template grid, and by analyzing data from the latest (third) observing run. In the frequency range searched, from 60 to 500 Hz, we find no evidence of gravitational radiation. This is the most sensitive search for Scorpius X-1 using a HMM to date. For the most sensitive subband, starting at 256.06 Hz, we report an upper limit on gravitational wave strain (at 95% confidence) of h 95 % 0 = 6.16 × 10 − 26 , assuming the orbital inclination angle takes its electromagnetically restricted value ι = 4 4 ° . The upper limits on gravitational wave strain reported here are on average a factor of ∼ 3 lower than in the second observing run HMM search. This is the first Scorpius X-1 HMM search with upper limits that reach below the indirect torque-balance limit for certain subbands, assuming ι = 4 4 °

Search for intermediate-mass black hole binaries in the third observing run of Advanced LIGO and Advanced Virgo

International audienceIntermediate-mass black holes (IMBHs) span the approximate mass range 100−105 M⊙, between black holes (BHs) that formed by stellar collapse and the supermassive BHs at the centers of galaxies. Mergers of IMBH binaries are the most energetic gravitational-wave sources accessible by the terrestrial detector network. Searches of the first two observing runs of Advanced LIGO and Advanced Virgo did not yield any significant IMBH binary signals. In the third observing run (O3), the increased network sensitivity enabled the detection of GW190521, a signal consistent with a binary merger of mass ∼150 M⊙ providing direct evidence of IMBH formation. Here, we report on a dedicated search of O3 data for further IMBH binary mergers, combining both modeled (matched filter) and model-independent search methods. We find some marginal candidates, but none are sufficiently significant to indicate detection of further IMBH mergers. We quantify the sensitivity of the individual search methods and of the combined search using a suite of IMBH binary signals obtained via numerical relativity, including the effects of spins misaligned with the binary orbital axis, and present the resulting upper limits on astrophysical merger rates. Our most stringent limit is for equal mass and aligned spin BH binary of total mass 200 M⊙ and effective aligned spin 0.8 at 0.056 Gpc−3 yr−1 (90% confidence), a factor of 3.5 more constraining than previous LIGO-Virgo limits. We also update the estimated rate of mergers similar to GW190521 to 0.08 Gpc−3 yr−1.Key words: gravitational waves / stars: black holes / black hole physicsCorresponding author: W. Del Pozzo, e-mail: [email protected]† Deceased, August 2020