Effects of isometric training on the knee extensor moment–angle relationship and vastus lateralis muscle architecture

Alegre, Luis M.; Ferri-Morales, Asunción; Rodríguez-Casares, Raúl; Jódar, Xavier Aguado

doi:10.1007/s00421-014-2967-x

Cited by 68 publications

(127 citation statements)

References 40 publications

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“…Recently, it has been reported that 8 weeks of isometric knee extension training at long muscle length induced greater strength gains compared to training at short muscle length [5]. However, although muscle thickness was increased similarly between groups, fascicle length was not altered after the two training interventions [5].…”

Section: Introductionmentioning

confidence: 94%

“…Recent studies aimed to investigate whether training at different muscle lengths of the knee extensors induces different muscle strength and mass adaptations [5][6][7][8]. Recently, it has been reported that 8 weeks of isometric knee extension training at long muscle length induced greater strength gains compared to training at short muscle length [5].…”

Section: Introductionmentioning

confidence: 99%

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Triceps Brachii Muscle Strength and Architectural Adaptations with Resistance Training Exercises at Short or Long Fascicle Length

Stasinaki

Zaras

Methenitis

et al. 2018

JFMK

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Abstract:The aim of this study was to investigate whether resistance training at short or long triceps brachii fascicle length induces different muscular strength and architectural adaptations. Nine young, novice, female participants, were trained for 6 weeks (two sessions/week) performing 6 sets × 6-RM (repetition maximum) unilateral cable exercises either with push-downs at short fascicle length (S) or overhead extensions with the contralateral arm at long fascicle length (L) of triceps brachii. Before and after training, 1-RM elbow extension and triceps brachii muscle architecture were evaluated. Muscle architecture was analyzed at 50% and 60% of the upper-arm length. Two-dimensional longitudinal muscle area of the triceps long head was also analyzed. The results indicated that 1-RM increased 40.1 ± 21.3% and 44.5 ± 20.1% (p < 0.01) after S and L, respectively. Muscle thickness at 50% length was increased 10.7 ± 15.3% (p < 0.05) and 13.7 ± 9.0% (p < 0.01) after S and L, while at 60% it was increased 15.5 ± 18.8% (p < 0.05) and 19.4 ± 16.3% (p < 0.01), respectively. Longitudinal muscle area increased similarly after S and L (p < 0.01). Fascicle angle and length were not altered with training. These results indicate that muscle strength and architecture of elbow extensors adapt similarly during the first six weeks of resistance training at either long or short fascicle length.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Triceps Brachii Muscle Strength and Architectural Adaptations with Resistance Training Exercises at Short or Long Fascicle Length

Stasinaki

Zaras

Methenitis

et al. 2018

JFMK

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“…1). These curves have been successfully reproduced in human dynamics as the angle-torque-velocity relationship using force transducers or isokinetic devices [24][25][26][27][28][29][30][31][32] . The angle-torque relationship is commonly explained in text books stating that the relative positions of the actin and myosin filaments change as the muscle contracts with the number of effective cross-bridges decreased or optimized 34) .…”

Section: Constant Length or Speed Trainingmentioning

confidence: 99%

“…The curvature of the angle-torque-velocity relationship can be altered by training, however the adaptive changes are specific to training 30,31,36) . It has been well documented that after weeks of isometric or isokinetic training, the strength gain is most promising at the joint angle or velocity of training, with "a transfer of strength gain" being possible near the joint angle or velocity at which the training has been undertaken 5,25,[30][31][32][36][37][38] .…”

Section: Constant Length or Speed Trainingmentioning

confidence: 99%

“…It has been well documented that after weeks of isometric or isokinetic training, the strength gain is most promising at the joint angle or velocity of training, with "a transfer of strength gain" being possible near the joint angle or velocity at which the training has been undertaken 5,25,[30][31][32][36][37][38] . The selective adaptations of muscles are proposed to result from specific alterations in the following aspects: 1) morphological (cross sectional area, the number of sarcomeres in series or the pennation angle), 2) neurological (neurotransmitter activity, recruitment patterns of the motor units, agonistantagonist activation or Golgi-tendon organ activity), and 3) biochemical (myosin ATPase activity), to match with the external training stimuli 5,[29][30][31][32][36][37][38][39] . The contributions of Fig.…”

Section: Constant Length or Speed Trainingmentioning

confidence: 99%

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Strategies for maximizing power and strength gains in isoinertial resistance training: Implications for competitive athletes

Sakamoto

Sinclair

Naito

2016

JPFSM

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Isoinertial resistance is imposed during natural human dynamics, where muscles contract at varying velocities and joint angles. In many sports, the ability to produce greater force at faster speed is essential for successful outcomes. Hence, power training under isoinertial resistance (e.g., body mass, weights or flywheel, etc.) provides event-specific adaptive stimuli. Conventional power training consists of a combination of strength-oriented (> 70% 1RM) and speed-oriented (< 30% 1RM, e.g., plyometrics) methods, with the aim of being able to overcome variable external loadings across a range of velocities. An alternative maximum power output training (Pmax training, 30-70% 1RM) has been found to elicit equivalent or greater effectiveness compared to the conventional methods. It is, however, difficult to precisely reproduce the prescribed intensities, given several concerns associated with 1RM testing and the variable accuracies of the repetition-intensity or velocity-intensity relationship. No matter what level of resistance is assigned to an exercise, it is far more important to exert as much effort (or fastest concentric speed) as possible per repetition, otherwise, the training effects are reduced. At light intensities, however, a large portion of the concentric phase is spent in deceleration for the subsequent phase transition, which may limit effort. Making projectile motions, therefore, are necessary. The utilization of stretch-shortening cycle effects, with increased power ability, may give a further training edge. Coaches and trainees should be aware that successful movements in power training are defined as greater acceleration, speed and displacement for every repetition, rather than simply neat form or smooth repetitiveness.

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Reliability of a semi-automated algorithm for the vastus lateralis muscle architecture measurement based on ultrasound images

et al. 2017

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Effects of isometric training on the knee extensor moment–angle relationship and vastus lateralis muscle architecture

Cited by 68 publications

References 40 publications

Triceps Brachii Muscle Strength and Architectural Adaptations with Resistance Training Exercises at Short or Long Fascicle Length

Triceps Brachii Muscle Strength and Architectural Adaptations with Resistance Training Exercises at Short or Long Fascicle Length

Strategies for maximizing power and strength gains in isoinertial resistance training: Implications for competitive athletes

Reliability of a semi-automated algorithm for the vastus lateralis muscle architecture measurement based on ultrasound images

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