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Acute neuromuscular responses to a resistance exercise session performed using the DeLorme and Oxford techniques

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Pereira R., Mendel M. M. A., Schettino L., Machado M., Augusto-Silva P.
Human Movement
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2013
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vol. 14
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issue 4
347-352
EN
Purpose. The purpose of this study was to examine and compare acute neuromuscular behavior during a resistance exercise session (RES) conducted with the DeLorme and Oxford techniques. Methods. Seven healthy and trained participants volunteered to carry out two RES, one week apart, of unilateral elbow flexion. Each session was conducted with the DeLorme or Oxford techniques in a counterbalanced order. Electromyographic (EMG) data were recorded from the biceps brachii (BB) and triceps brachii (TRIC) during a maximal isometric voluntary contraction. Normalized EMG amplitude from BB and TRIC and the co-contraction ratio (CCR) during the concentric and eccentric phases were calculated. Results. The EMG amplitude from BB and TRIC as well as the CCR of both the concentric and eccentric phases were similar in both techniques. Additionally, normalized EMG amplitude from BB was higher during the concentric phase when compared with the eccentric phase for both techniques, supporting the hypotheses of distinct neural control for concentric and eccentric phases of movement. The DeLorme and Oxford techniques induced similar acute neuromuscular responses during the RES. Conclusions. Our results may support previous findings on similar strength gains after resistance training performed with both analyzed techniques.
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Comparison of two different rest intervals on drop jump: effects on muscle damage markers

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Eiras A., Reis R., Silva P., Monteiro A., Machado M.
Biomedical Human Kinetics
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2009
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vol. 1
76-78
EN
Study aim: To determine the effects of 60- or 180-s rest intervals between sets of drop jump (DJ) exercise on serum creatine kinase (CK) activity and perceived muscle soreness.Materials and methods: A group of 36 healthy male subjects aged 18 - 19 years performed 4 sets of 10 DJ, the rest intervals between sets amounting to 60 (Group A) or 180 s (Group B). Before, as well as 3, 24, 48, and 72 h post-exercise, blood was sampled for determining the activity of in serum CK activity and the perceived muscle soreness was reported. Two-way ANOVA (time x rest interval) was used in data analysis.Results: The DJ sessions induced muscle soreness and elevated serum CK activity (p<0.05). No significant between-group differences were found.Conclusion: Rest intervals of 1 - 2 min duration had no effect on the magnitude of changes in CK activity or perceived muscle soreness. This may be of practical importance when designing training which includes drop jumps.
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