6 research outputs found
Bidirectional association between physical activity and muscular strength in older adults: Results from the UK Biobank study.
Get PDFBACKGROUND: The relationship between physical activity and muscular strength has not been examined in detail among older adults. The objective of this study was to examine the associations between physical activity and hand grip strength among adults aged ≥ 60 years. METHODS: Using data from the UK Biobank study, we included 66 582 men and women with complete baseline data and 6599 with 4.5 years of follow-up data. We used multiple linear regression models to examine the cross-sectional, longitudinal and bidirectional associations between moderate-to-vigorous physical activity (MVPA) and grip strength, adjusting for potential confounding by age, sex, height, weight, health status, education level, smoking status, Townsend deprivation index and retirement status. RESULTS: In cross-sectional analyses, grip strength and MVPA were linearly and positively associated with each other. Longitudinally, baseline MVPA was not associated with grip strength at follow-up {difference between quintile [Q] 5 and Q1 = 0.40 [95% confidence interval (CI): -0.14, 0.94]kg}, whereas baseline grip strength was associated with MVPA at follow-up [Q5 vs Q1 = 7.15 (1.18, 13.12) min/day]. People who maintained/increased time spent in MVPA did not experience any benefit in grip strength [0.08 (-0.20, 0.37) kg] whereas those who increased their grip strength spent 3.69 (0.20, 7.17) min/day extra in MVPA. CONCLUSION: Promotion of strength-training activities may enable and maintain participation in regular physical activity among older adults.This work was supported by the Medical Research Council [Programme number: MC_UU_12015/4] and has been conducted using the UK Biobank Resource.This is the final version of the article. It first appeared from Oxford University Press via https://doi.org/10.1093/ije/dyw05
Experimental platform for the investigation of magnetized-reverse-shock dynamics in the context of POLAR
No full textThe influence of a strong external magnetic field on the collimation of a high Mach number plasma flow and its collision with a solid obstacle is investigated experimentally and numerically. The laser irradiation (I ∼ 2 × 1014 W · cm−2 ) of a multilayer target generates a shock wave that produces a rear side plasma expanding flow. Immersed in a homogeneous 10 T external magnetic field, this plasma flow propagates in vacuum and impacts an obstacle located a few mm from the main target. A reverse shock is then formed with typical velocities of the order of 15–20 ± 5 km/s. The experimental results are compared with 2D radiative magnetohydrodynamic simulations using the FLASH code. This platform allows investigating the dynamics of reverse shock, mimicking the processes occurring in a cataclysmic variable of polar type
Experimental platform for the investigation of magnetized-reverse-shock dynamics in the context of POLAR
No full textThe influence of a strong external magnetic field on the collimation of a high Mach number plasma flow and its collision
with a solid obstacle is investigated experimentally and numerically. The laser irradiation (I ∼ 2 × 1014 W · cm−2
) of a
multilayer target generates a shock wave that produces a rear side plasma expanding flow. Immersed in a homogeneous
10 T external magnetic field, this plasma flow propagates in vacuum and impacts an obstacle located a few mm from the
main target. A reverse shock is then formed with typical velocities of the order of 15–20 ± 5 km/s. The experimental
results are compared with 2D radiative magnetohydrodynamic simulations using the FLASH code. This platform allows
investigating the dynamics of reverse shock, mimicking the processes occurring in a cataclysmic variable of polar type
