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MEDICINA DELLO SPORT
A Journal on Sports Medicine
Official Journal of the Italian Sports Medicine Federation
Indexed/Abstracted in: BIOSIS Previews, EMBASE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 0,163
Medicina dello Sport 2014 June;67(2):227-40
language: English, Italian
Myoelectric manifestations of muscle fatigue induced by weight or elastic resistances in men and women
Melchiorri G. 1, 2, Triossi T. 3, Viero V. 3, Tancredi V. 1, Rainoldi A. 4
1 School of Sport and Exercise Sciences, Department of Systems Medicine, Faculty of Medicine and Surgery, University of Roma Tor Vergata, Rome, Italy;
2 Don Gnocchi Foundation, Milan, Italy;
3 University of Rome Tor Vergata, Rome, Italy;
4 Department of Medical Sciences, Motor Science Research Center, SUISM, School of Exercise and Sport Sciences, University of Turin, Turin, Italy
AIM: The purpose of this paper was to analyze gender differences in mechanical and myoelectric manifestations of muscle fatigue induced by different types of resistance (elastic tubes and traditional weights). Reference values were the maximal voluntary contraction (MVC) for the isometric contractions and 1RM for the dynamic tests. Subjects were requested to perform a 60 s fatiguing isometric contraction at 60% MVC and exhaustion test at 70% MVC.
METHODS: sEMG signals were recorded, using a linear array of eight electrodes, from biceps brachii on the dominant side in a population of 18 men (27±5 years) and 16 women (25±5) healthy and sedentary. MVC, endurance time, initial value of EMG variables (conduction velocity-CV, mean power frequency-MNF, average rectified value-ARV) were analyzed. The analysis was carried out for all variables before and after the fatiguing contraction, in relation to the different types of resistance and gender.
RESULTS: MVC values were found greater in man (310.9±80.7 N; 290.9±80.3 N) than in female (100.8±30.1; 100.6±30.7 N, P<0.05) in both the contraction modalities (weight and elastic, respectively) and endurance time (85% difference, P<0.05). ARV and MNF initial value were found to decrease more in elastic than in weight exercise in both genders, whereas CV showed an opposite behavior. In general, EMG fatigue was found greater in male than in female.
CONCLUSION: Women were found more resistant to myoelectric fatigue than male and elastic were found more fatiguing than traditional weight exercises. These findings can pivot proper design and use of both rehabilitation and training program with such devices in different gender groups.