Journal ArticleDOI
Short-term unilateral resistance training affects the agonist-antagonist but not the force-agonist activation relationship.
TLDR
Strength gains in the trained leg were due to enhanced agonist activation, whereas decreased coactivation may have affected strength changes in both legs.Abstract:
In this study we investigated the contribution of neural adaptations to strength changes after 4 weeks of unilateral isometric resistance training. Maximal and submaximal isometric knee extension contractions were assessed before and after training. Surface electromyography (EMG) data were collected from the agonist and antagonist muscles and normalized to evoked maximal M-wave and maximal knee flexor EMG, respectively. The interpolated twitch technique (ITT) was also used to determine activation at maximum voluntary force (MVF). MVF increased in the trained (+20%) and untrained (+8%) legs. Agonist EMG at MVF increased in the trained leg (+26%), although activation determined via the ITT was unchanged. In both legs the position of the force-agonist EMG relationship was unchanged, but antagonist coactivation was lower for all levels of agonist activation. Strength gains in the trained leg were due to enhanced agonist activation, whereas decreased coactivation may have affected strength changes in both legs.read more
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Rate of force development: physiological and methodological considerations
Nicola A. Maffiuletti,Per Aagaard,Anthony J. Blazevich,Jonathan J. Folland,Neale N. Tillin,Jacques Duchateau +5 more
TL;DR: Evidence-based practical recommendations are provided for rational quantification of rate of force development in both laboratory and clinical settings and various methodological considerations inherent to its evaluation are discussed.
Journal ArticleDOI
Explosive force production during isometric squats correlates with athletic performance in rugby union players
TL;DR: Results suggest that explosive force production during isometric squats was associated with athletic performance, and sprint performance was most strongly related to the proportion of maximal force achieved in the initial phase of explosive-isometric squats, whilst jump height was most strong related to absolute force in the later phase of the explosive- Isometric squats.
Journal ArticleDOI
Reliability of neuromuscular measurements during explosive isometric contractions, with special reference to electromyography normalization techniques
TL;DR: The high intra‐individual variability of EMG and early phase explosive voluntary force production may limit their use to measuring group as opposed to individual responses to an intervention.
Journal ArticleDOI
Short-term training for explosive strength causes neural and mechanical adaptations.
TL;DR: The increases in explosive octet force and muscle–tendon unit stiffness provide novel evidence of peripheral adaptations within merely 4 weeks of training for explosive force production.
Journal ArticleDOI
Maximal and explosive strength training elicit distinct neuromuscular adaptations, specific to the training stimulus
TL;DR: Evidence for distinct neuromuscular adaptations after MST vs. EST that are specific to the training stimulus is provided, and the independent adaptability of maximal and explosive strength is demonstrated.
References
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Journal ArticleDOI
Spinal and Supraspinal Factors in Human Muscle Fatigue
TL;DR: Evidence for "central" fatigue and the neural mechanisms underlying it are reviewed, together with its terminology and the methods used to reveal it.
Journal ArticleDOI
Increased rate of force development and neural drive of human skeletal muscle following resistance training
TL;DR: Increases in explosive muscle strength (contractile RFD and impulse) were observed after heavy-resistance strength training, which could be explained by an enhanced neural drive, as evidenced by marked increases in EMG signal amplitude and rate of EMG rise in the early phase of muscle contraction.
Journal Article
Neural factors versus hypertrophy in the time course of muscle strength gain
Moritani T,deVries Ha +1 more
TL;DR: The results indicated that neural factors accounted for the larger proportion of the initial strength increment and thereafter both neural factors andhypertrophy took part in the further increase in strength, with hypertrophy becoming the dominant factor after the first 3 to 5 weeks.
Journal ArticleDOI
The adaptations to strength training : morphological and neurological contributions to increased strength.
TL;DR: The gains in strength with HRST are undoubtedly due to a wide combination of neurological and morphological factors, although there is contrary evidence suggesting no change in cortical or corticospinal excitability.
Journal ArticleDOI
Skeletal muscle adaptations during early phase of heavy-resistance training in men and women
Robert S. Staron,D. L. Karapondo,William J. Kraemer,Andrew C. Fry,Scott E. Gordon,J. E. Falkel,Fredrick C. Hagerman,Robert S. Hikida +7 more
TL;DR: The data suggest that skeletal muscle adaptations that may contribute to strength gains of the lower extremity are similar for men and women during the early phase of resistance training and, with the exception of changes in the fast fiber type composition, that they occur gradually.