Stress-Strain Response of Muscle Fibers in Biceps Brachii under Dynamic Force: An Analysis of Biceps Curl Exercise

Öz

One of the most important features of endurance training was to increase the weight of the dumbbells between sets. According to the relationship of the contractile force in the muscles, the porpuse was to increase muscle growth by gaining more contractile force. Previous studies had generally examined muscle behavior under maximum force. However, the relationship between increased dumbbell weight and muscle contraction was not fully investigated. The aim of this study was to investigate the mechanical behaviors resulting from the application of dynamic forces that occur during the dumbbell curl exercise on muscle fibers. In this study, biceps brachii muscle force during biceps curl exercise performed with two different weights (5kg and 10kg) was calculated. Then, a finite element model was developed and mechanical behaviors in the biceps muscle fiber during exercise were investigated. It was achieved that there was no linear correlation between dumbbell weight and muscle force. It was observed that when dumbbell weights were doubled (100%), the maximum muscle force and deformation increased by 83.13% and 84.92%, respectively. The results showed that increasing excessive weight during exercises will not be as beneficial for muscle development as expected.

Anahtar Kelimeler

• Hill-type muscle model
• Musculoskeletal model
• Muscle force
• Finite Element Method
• COMSOL Multiphysics 5.5

Pazu Kası Lifinin Dinamik Kuvvet Altındaki Gerilme-Gerinme Davranışı: Bir Ön Kol Bükme Egzersizi Analizi

Öz

Dayanıklılık egzersizlerinin en önemli özelliklerinden biri setler arasında egzersiz ağırlığının artırılmasıdır. Kaslardaki kasılma-kuvvet ilişkisi sayesinde daha yüksek bir kasılma kuvveti elde edilerek kas gelişiminin artırılması amaçlanmaktadır. Önceki çalışmalarda genellikle maksimum yük altındaki kas davranışının incelendiği görülmüştür. Ancak egzersiz ağırlığının artırılması ile kas kasılması arasındaki ilişki tam olarak incelenmemiştir. Bu çalışmada iki farklı ağırlıkla (5kg ve 10kg) yapılan biceps curl egzersizi esnasında meydana gelen biceps brachii kas kuvveti hesaplanmıştır. Daha sonra bir sonlu elemanlar modeli oluşturularak egzersizler esnasında biceps brachii kas lifinde meydana gelen mekanik değişimler incelenmiştir. Sonuçlara bakıldığında egzersiz ağırlığı ile kas kuvveti arasında doğrusal bir ilişki olmadığı görülmüştür. Ağırlığın iki katına çıktığı (%100) durumda maksimum kas kuvveti ve deformasyonun sırasıyla %83.13 ve %84.92 oranında arttığı görülmüştür. Elde edilen sonuçlar egzersizler esnasında aşırı ağırlık artırmanın kas gelişimine beklenildiği kadar fayda sağlamayacağını göstermektedir.  

Anahtar Kelimeler

• Hill tipi kas modeli
• kas-iskelet modeli
• sonlu elemanlar modeli
• COMSOL Multiphysics 5.5
• kas kuvveti

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