The aim of this study was to test the influence of 3 different horizontal distances between the blocks (bunched, medium and elongated) on the velocity of the centre of mass (VCM) and the kinetic energy (KE) of the body segments and of the whole body. 9 well-trained sprinters performed 4 maximal 10 m sprints. An opto-electronic Motion Analysis® system (12 digital cameras 250 Hz) was used to collect the 3D trajectories of 63 markers during the starting block phase. The results demonstrated that the elongated start, compared to the bunched or medium start, induced an increase of VCM at block clearing (2.89±0.13; 2.76±0.11; 2.84±0.14 m.s - 1) and a decrease of the performance at 5 and 10 m. Both results were explained by a greater pushing time on the blocks in the elongated condition. During the starting block phase, the KE of the whole body was greater in the elongated start (324.3±48.0 J vs. 317.4±57.2 J, bunched and 302.1±53.2 J, medium). This greater KE of the whole body was mainly explained by the KE of the head-trunk segments. Thus, to improve the efficiency of the starting block phase, the athlete must produce greater KE of the head and trunk segments in the shortest time.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1055/s-0032-1304587 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Rigid Plastic-Free Fibreboards Made from "Hairy" Cellulose Fibres and Oil Palm Empty Fruit Bunch.
ChemSusChem
December 2024
Department of Aeronautics, Imperial College London, Exhibition Road, London, SW7 2AZ, UK.
Empty fruit bunch (EFB), an abundant lignocellulosic residue from the palm oil milling process, is typically discarded on open land or used as mulch. In this work, a simple method that mimics a papermaking process, was developed to upcycle EFB into higher value fibreboard without the need for any polymeric binders. The cellulose network from pulp fibres was utilised to hold the otherwise loose EFB fibres together to produce a rigid EFB fibreboard.
View Article and Find Full Text PDFAgro-Industrial Wastes as Potential Substrates for Rhamnolipid Production by USM-AR2.
Trop Life Sci Res
March 2024
School of Biological Sciences, Universiti Sains Malaysia, 11800 USM Pulau Pinang, Malaysia.
Rhamnolipid has gained much attention in various fields owing to its distinctive functional properties compared to conventional chemical surfactants, which are mostly derived from petroleum feedstock. Production cost is one of the main challenges in rhamnolipid production, particularly when using refined substrates. One possible solution is to use agro-industrial wastes as substrates for rhamnolipid production.
View Article and Find Full Text PDFNano cells from fruit bunch residue: Nestling nanotechnology within the circular oil palm milling residue management.
Heliyon
May 2024
Nano-Optoelectronic Research and Technology (NOR) Lab, School of Physics, Universiti Sains Malaysia, 11800, USM, Penang, Malaysia.
Nano-structured materials gain a vast market acceptance mainly due to their overarching endurance. Nanofibrillar cellulose (NFC) is one example of an augmenting agent unviable for production by small and medium enterprises (SMEs) due to the underlying process complexity. This study aims to characterise the NFC-alternative cells denoted as TRX-cells, which is a mix of cellulose and non-cellulose components, ruling out its status as 'cellulose nanofibers, CNF'.
View Article and Find Full Text PDFFumaric acid production by Rhizopus species from acid hydrolysate of oil palm empty fruit bunches.
Braz J Microbiol
June 2024
Bioprocess Engineering and Biotechnology Department, Federal University of Paraná, Brazil, Polytechnic Center, CP 19011, Curitiba, 81531-908, Brazil.
The hemicellulosic fraction of lignocellulosic biomass is a very important material, due to the significant concentration of pentoses present in its composition and that can be used sustainably in biotechnological processes such as the production of fumaric acid. Research efforts are currently being promoted for the proper disposal and valorization of empty fruit bunches (EFB) from oil palm. In this work, seventeen Rhizopus species were evaluated in a fermentation medium with EFB hydrolyzate, without detoxification, as a carbon source for fumaric acid production.
View Article and Find Full Text PDFRecycling of deep eutectic solvent in the extraction of ferulic acid from oil palm empty fruit bunch.
J Sep Sci
February 2024
Engineering and Processing Research Division, Malaysian Palm Oil Board, Kajang, Malaysia.
The study explored ferulic acid extraction from palm empty fruit bunch (EFB) fiber using deep eutectic solvent (DES) of chlorine chloride-acetic acid as the extraction medium and the way to recover and recycle the DES thereafter. Antisolvent was added to selectively precipitate the ferulic acid, which was recovered by filtration thereafter. Recycling the DES without further purification led to increased ferulic acid yield with each subsequent extraction, likely due to retained ferulic acid.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!