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Men detta ignorerar det faktum att v? - TodoGeologia.com
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Men detta ignorerar det faktum att v?

En este foro podéis presentaros y hablarnos un poco de vosotros, qué hacéis, a qué os dedicáis...
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Labi1995
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Men detta ignorerar det faktum att v?

Mensajepor Labi1995 » Lun, 11 Mar 2019, 06:19

Clarke et. al (1983) m?tt h?jden p? den vertikala slagstoppen, den tid det tog f?r att n? den vertikala slagstoppen (som ger information om hur snabbt slagkraften applicerades), h?jden p? den aktiva toppen, liksom n?gra andra g?ngvariabler. Med tanke p? att skorna som j?mf?rdes var i motsatta extremiteter av fasthetsspektret var resultaten ganska intressanta. F?rst och n?got ?verraskande fann de ingen signifikant skillnad i h?jden p? slagspiken mellan de tv? skorna. Med andra ord var slagkraftsniv?n detsamma i genomsnitt om en l?pare hade en mjuk sko eller en fast sko. Den tid det kr?vde att n? toppstoppet visade sig skilja sig, med den mjukare skon som f?rdr?jer slagstoppet med ca 4 millisekunder i genomsnitt (det betyder att den mjukare skon tenderade att sakta ner p?verkan av slagkraften, vilket f?rmodligen ?r en bra sak). F?r det tredje fann de att den aktiva toppen (de refererar till den som den propulsiva toppen) var signifikant h?gre i genomsnitt i den mjukare skon.
Sammanfattningsvis ser du bara inte p? de genomsnittliga resultaten, men mjukare kuddar skor inte verkar minska effektkraften, men de s?nker hastigheten vid vilken kraften appliceras p? kroppen (mycket som en boxhandske skulle sakta ner hastigheten vid vilken p?verkan appliceras p? din hand om du stansade en tegelv?gg). Mjuka skor resulterar ocks? i h?gre krafter i mitten - f?rfattarna misst?nker att detta kan relateras till ?kad h?lsp?tr?ngning i mellansolen under h?llning, vilket g?r det m?jligt f?r kalvsmusklerna att ut?va st?rre framdrivningskraft under framfoten p? pushoff (om h?len sjunker in i misdol under tryck, s?nker det faktiskt fallet f?r h?l-framfoten. Dessa resultat, s?rskilt betr?ffande slagkraft, verkar n?got kontraintuitiva - l?pare tror i allm?nhet att st?rre d?mpning minskar slagkraftens storlek och tunga l?pare ofta riktas till maximalt kuddade skor av samma anledning. Men detta ignorerar det faktum att v?r kropp ?r ganska darned intelligent, och benen anpassar sin styvhet till f?rh?llandena under foten (l?s det h?r inl?gget f?r mer om benstyvhet i k?rning). N?r vi k?r i en fast sko, tenderar v?ra kn?n att b?jda sig mer ?n de g?r n?r vi k?r i en mjuk sko - genom att byta egenskaper p? mellansolen ?r allt vi g?r, skiftande d?mpande fr?n ett st?lle till ett annat (under foten f?r att s?ga kn?leden ) och storleken p? slagkraften f?rblir densamma. Vad som ?r v?ldigt intressant om denna studie ?r n?r man tittar p? de enskilda resultaten, vilket ?r ganska varierande. Tv? individer uppvisade ingen p?verkans topp alls, och deras resultat var s?ledes inte inkluderade i konsekvens j?mf?relserna (f?rfattarna spekulerade att de var midfootstrejkare). H?r ?r resultaten som individerna (krafterna m?ts i kroppsvikt) N?r man tittar p? dessa resultat p? individens niv? blir det klart att svaren ?r n?got variabla. I synnerhet, om man tittar p? resultaten f?r slagkraft topp i ?mnen 4 och 5, uppvisar de helt motsatta svar p? de tv? skorna. ?mne 4 p?verkar betydligt h?rdare i h?rdskor, men ?mne 5 p?verkar betydligt h?rdare i mjukskon. S?, ?ven om det genomsnittliga effektsvaret mellan de tv? skorna inte var signifikant olika, vilket tyder p? att mellansula h?rdhet inte beh?ver beaktas n?r det g?ller att hantera slagkraft, f?r dessa tv? individer ?r det mycket viktigt. Om vi ??antar att minskande slagkraft ?r en bra sak (den h?r punkten ?r diskutabel eftersom effekten kan stimulera bentillv?xt och vi har ingen aning om vilka tr?skelgr?nser f?r p?verkan som kan vara problematiska f?r varje enskild individ) skulle dessa tv? l?pare kr?va helt olika typer av skor! Att g? ?nnu l?ngre l?ngs denna r?kning, om v?rt m?l var att ge en sko till dessa l?pare f?r att minska p?verkan, ?r den konventionella visdomen att mer d?mpning ?r v?gen att g? - men det skulle vara fel svar f?r 50% av l?pare unders?kte h?r som hade h?gre inverkningstoppar i de mjukare skor. Detta ?r vad som g?r vilse n?r man tittar p? vanliga svar - de s?ger inte vad som ?r b?st p? en enskild niv?. Du kan se samma typ av sak n?r du skannar de andra kolumnerna. Mjuka skor verkar i allm?nhet f?rdr?ja p?verkstopp, men inte i 100% av fallen, och hos vissa individer ?r skillnaden mycket liten mellan de tv? skorna. Mjuka skor verkar resultera i en h?gre aktiv topp, men igen, ibland ?r skillnaden ganska liten.

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