Unit:
Κατεύθυνση Εργοφυσιολογία, Διατροφή, Άσκηση και Ποιότητα ΖωήςLibrary of the School of Physical Education and Sport Science
Author:
Karyofyllidou Anastasia
Supervisors info:
Βασίλης Πασχάλης, Αναπληρωτής Καθηγητής, ΣΕΦΑΑ - ΕΚΠΑ
Γεράσιμος Τερζής, Καθηγητής, ΣΕΦΑΑ - ΕΚΠΑ
Δημήτρης Μανδαλίδης, Αναπληρωτής Καθηγητής, ΣΕΦΑΑ - ΕΚΠΑ
Original Title:
Σύγκεντρη και έκκεντρη ισοκινητική άσκηση σε μεγάλο μήκος μυός: Αξιολόγηση φυσιολογικών και υπερηχογραφικών παραμέτρων του μυϊκού μικροτραυματισμού.
Translated title:
Concentric and eccentric isokinetic exercise at a large muscle length: Evaluation of physiological and ultrasonographic parameters of muscle damage.
Summary:
It is widely accepted and well documented that acute unusual eccentric exercise is accompanied by muscle damage. However, this cause-causation relationship is disputed. Eccentric exercise is not the only type of exercise that can lead to muscle damage. High-intensity concentric exercise or isometric contraction triggered by electrical stimulation can also cause muscle damage. It seems that the decisive factor for causing muscle damage is the action length of the muscle fiber, specifically the longer the length that the muscle acts, the greater the muscle damage will be. The purpose of the study was to investigate the effect of long muscle length during concentric and eccentric muscle contraction on exercise-induced muscle damage. The changes in the functional and morphological characteristics of the flexors of the elbow joint were examined. Thirteen moderately active subjects, who had abstained from resistance exercise for the past three months (age 23 ± 3 years, body mass 61 ± 9 kg, height 167 ± 6 cm) visited the laboratory five times. At the first visit, an isokinetic concentric and eccentric exercise was performed, one on each upper limb (elbow flexors), selected in a randomized way. Each type of exercise consisted of 5 sets of 15 repetitions of maximum intensity, with an angular velocity of 45°/s, while the range of motion was limited to 45° (5°-50°, where 0° is full extension). Peak torque, delayed onset muscle soreness, range of motion, and ultrasound parameters (muscle thickness and echo intensity) were measured to assess muscle damage. All biomarkers of muscle damage were measured before exercise, as well as 24, 48, 72 and 96 hours after.A two-way ANOVA repeated measures analysis of variance was performed. The level of significance in all statistical parameters was set at 5% (p < 0.05). Peak eccentric torque, range of motion, delayed onset muscle soreness, and biceps brachii echo intensity showed a statistically significant difference in time (p < 0.05) but not type of exercise. Muscle thickness and echo intensity in the anterior humerus showed no differences in both time and type of exercise. Maximum isometric and concentric torque did not show significant differences by time but did by condition (p < 0.05). The results showed that performing exercise on a long muscle can cause exercise-induced muscle damage regardless of the type of muscle contraction.
Main subject category:
Education - Sport science
Keywords:
Muscle danage, Concentric/Eccentric muscle contraction, Delayed onset muscle soreness (DOMS), Torque, Range of motion
File:
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Karyofyllidou_MSc_final.pdf
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File access is restricted only to the intranet of UoA.
