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Bücher Ratgeber & Freizeit Englische Bücher Gesundheit Contradictory Tension: Lombard's Paradox in Human Biomechanics
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Contradictory Tension: Lombard's Paradox in Human Biomechanics
Olivia Smith (Broschiert, Englisch)
★★★★★
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Beschreibung
How is it physically possible for a human being to stand up from a seated position, given that the two major muscle groups required to perform the action actually pull the bones in completely opposite directions? This bizarre mechanical contradiction in human anatomy is known in kinesiology as Lombard's Paradox. When you rise from a chair, you must extend both your hip and your knee. However, the… rectus femoris (quadriceps) extends the knee but flexes the hip, while the hamstrings extend the hip but flex the knee. Logically, if both muscles fire at the same time, they should perfectly cancel each other out, locking your leg in a stiff, paralyzed spasm. Yet, we stand up effortlessly. The paradox is resolved by a brilliant evolutionary hack in our mechanical leverage: because the muscles have different "moment arms" (distances from the joint center) at the hip and knee, the extension force mathematically overrides the flexion force at both joints simultaneously. This fascinating biomechanical manual dissects the hidden physics of everyday movement. It explores the complex neurological signaling required for muscular co-contraction, the evolutionary design of the human femur, and why understanding this paradox is crucial for physical therapy and athletic performance. Appreciate the brilliant engineering of your own body. Lombard's Paradox proves that human movement is not just simple biology; it is a highly complex, flawlessly calculated symphony of physical leverage. Dieses Produkt haben wir gerade leider nicht auf Lager.
Handgeprüfte Gebrauchtware
Bis zu 50 % günstiger als neu
Der Umwelt zuliebe
Technische Daten
Erscheinungsdatum
27.05.2026
Sprache
Englisch
EAN
9783565463046
Herausgeber
epubli
Sonderedition
Nein
Autor
Olivia Smith
Seitenanzahl
112
Auflage
1
Einbandart
Broschiert
Buch Untertitel
Muscles, Leverage, and the Counter-Intuitive Neurological Physics of Simply Standing Up
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