الإنتاج البحثي لأعضاء هيئة التدريس بالكلية V.8 - Flipbook - Page 163
روﻧﻲ راﻣﺰ إﺑﺮاھﯿﻢ.د
ﺟﺎﻣﻌﺔ ﻗﻄﺮ- أﺳﺘﺎذ ﻣﺴﺎﻋﺪ ﺑﻘﺴﻢ اﻟﺘﺮﺑﯿﺔ اﻟﺒﺪﻧﯿﺔ – ﻛﻠﯿﺔ اﻟﺘﺮﺑﯿﺔ
rony.ibrahim@qu.edu.qa
ORCID
0000-0003-2481-9726
Scopus ID
57811031800
(1) Majed, L., Ibrahim, R., Lock, M. J., & Jabbour, G. (2024). Walking around the preferred
speed: examination of metabolic, perceptual, spatiotemporal and stability parameters. Frontiers in
physiology, 15, 1357172.
DOI: https://doi.org/10.3389/fphys.2024.1357172
Walking is the most accessible and common type of physical activity. Exercising at one’s selfselected intensity could provide long-term benefits as compared to following prescribed intensities.
The aim of this study was to simultaneously examine metabolic, perceptual, spatiotemporal and
stability parameters at an absolute 3 km·h−1 speed range around the individual preferred walking
speed (PWS). Thirty-four young sedentary adults (18 women) volunteered to walk at seven speeds
relative to their PWS in 3-min trials interspaced with 3-min rest intervals. Results indicated a
significant main effect of speed on all studied variables. While metabolic, perceptual and
spatiotemporal values were sensitive to the smallest change in speed (i.e., 0.5 km·h−1), a significant
increase in the rate of carbohydrate oxidation and decrease in %fat oxidation were only observed
at speeds above PWS. Results also revealed significantly higher coefficients of variation for stride
characteristics at speeds below PWS only. Moreover, analyses of best fit models showed a
quadratic relationship between most variables and speed, with the exceptions of metabolic cost of
transport, rating of perceived exertion and stride duration that changed exponentially with speed.
PWS coincided with optimized mechanical efficiency, fuel oxidation and gait stability. This
indicated that walking below PWS decreased both mechanical efficiency and stability of gait, while
walking above PWS increased carbohydrate oxidation. Those factors seem to play an important
role as determinants of PWS. We suggest that walking at PWS may provide benefits in terms of fat
oxidation while optimizing gait stability.
(2) Holdback, C. J., Ibrahim, R., Haydon, D. S., Pinder, R. A., Grimshaw, P. N., & Kelso, R.
M. (2023). Seated-Shot-Put Equipment in Para Athletics—A Review and Presentation of Data
From the Tokyo 2020 Paralympic Games. Adapted Physical Activity Quarterly, 1(aop), 1-18.
DOI: https://doi.org/10.1123/apaq.2022-0168
This research provides a review of seated shot put alongside new data from the Tokyo 2020
Paralympic Games with the aim to understand the latest trends in equipment within a recently
established rule set and how key equipment variables may impact performance for athletes in
different classifications. First, a review of the literature found that the throwing pole is a key
equipment aid that is not well understood, in part due to limitations in testing design. New data
from the 2020 Paralympic Games showed inconsistent trends for the use of the throwing pole
among athletes, particularly in transitionary classes (F33–34 and F54–55). A two-way analysis of
variance found a main effect of classification on performance (p < .001), as well as an interaction
effect between pole use and classification on performance (p < .05). Notably, pole users are seen to
perform better than non–pole users in Class F32 (p < .05).
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