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Amador García-Ramos, Alejandro Torrejón, Antonio J. Morales-Artacho, Alejandro Pérez-Castilla and Slobodan Jaric

reliability of cycle ergometer-based assessment conducted within a wide range of resistive forces using both the standard method (ie, evaluation performed under a single resistive force) and the novel 2-point method (assessment of the muscle capacities through the force-velocity relationship observed from 2

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Anne O. Brady, Chad R. Straight and Ellen M. Evans

The aging process leads to adverse changes in body composition (increases in fat mass and decreases in skeletal muscle mass), declines in physical function (PF), and ultimately increased risk for disability and loss of independence. Specific components of body composition or muscle capacity (strength and power) may be useful in predicting PF; however, findings have been mixed regarding the most salient predictor of PF. The development of a conceptual model potentially aids in understanding the interrelated factors contributing to PF with the factors of interest being physical activity, body composition, and muscle capacity. This article also highlights sex differences in these domains. Finally, factors known to affect PF, such as sleep, depression, fatigue, and self-efficacy, are discussed. Development of a comprehensive conceptual model is needed to better characterize the most salient factors contributing to PF and to subsequently inform the development of interventions to reduce physical disability in older adults.

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Caroline Giroux, Giuseppe Rabita, Didier Chollet and Gaël Guilhem

Performance during human movements is highly related to force and velocity muscle capacities. Those capacities are highly developed in elite athletes practicing power-oriented sports. However, it is still unclear whether the balance between their force and velocity-generating capacities constitutes an optimal profile. In this study, we aimed to determine the effect of elite sport background on the force–velocity relationship in the squat jump, and evaluate the level of optimization of these profiles. Ninetyfive elite athletes in cycling, fencing, taekwondo, and athletic sprinting, and 15 control participants performed squat jumps in 7 loading conditions (range: 0%–60% of the maximal load they were able to lift). Theoretical maximal power (Pm), force (F 0), and velocity (v 0) were determined from the individual force–velocity relationships. Optimal profiles were assessed by calculating the optimal force (F 0th) and velocity (v 0th). Athletic sprinters and cyclists produced greater force than the other groups (P < .05). F 0 was significantly lower than F 0th, and v 0 was significantly higher than v 0th for female fencers and control participants, and for male athletics sprinters, fencers, and taekwondo practitioners (P < .05). Our study shows that the chronic practice of an activity leads to differently balanced force–velocity profiles. Moreover, the differences between measured and optimal force–velocity profiles raise potential sources of performance improvement in elite athletes.

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Michely V. Andreatta, Victor M. Curty, João Victor S. Coutinho, Miguel Ângelo A. Santos, Paula F. Vassallo, Nuno F. de Sousa and Valério G. Barauna

evaluate whether cfDNA levels are associated with functional muscle capacity until 48 hours of the exercise session. Materials and Methods Subjects In total, 10 healthy young men (age: 24 [6] y, weight: 74.7 [8] kg, and height: 171 [7] cm) and 10 healthy young women (age: 23 [5] y, weight: 59.3 [6] kg, and

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Remco J. Baggen, Jaap H. van Dieën, Sabine M. Verschueren, Evelien Van Roie and Christophe Delecluse

through MVIC. 7 For some muscles, studies have found activation reaching up to 300% of predetermined maximum voluntary excitation during dynamic task performance, 7 leading to overestimations of the proportion of individual muscle capacity required for dynamic task performance. 5 In addition

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Francisco J. Amaro-Gahete, Lucas Jurado-Fasoli, Alejandro R. Triviño, Guillermo Sanchez-Delgado, Alejandro De-la-O, Jørn W. Helge and Jonatan R. Ruiz

2 max present greater muscle capacity to oxidize fat, 12 , 13 the relation of VO 2 max with MFO and Fat max in endurance-trained male athletes remains to be elucidated. Therefore, the aim of this study was to analyze the diurnal variations of MFO and Fat max in endurance-trained male athletes. We

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Kajetan J. Słomka, Slobodan Jaric, Grzegorz Sobota, Ryszard Litkowycz, Tomasz Skowronek, Marian Rzepko and Grzegorz Juras

variables that was well below the instructed decrease in the instructed effort. Nevertheless, the main implication of this finding is that any phenomena associated with a reduced-effort jump could markedly reduce the validity of the prediction of muscle capacities for producing high force and power output

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José Messias Rodrigues da Silva, Marcia Uchoa de Rezende, Tânia Carvalho Spada, Lucila da Silva Francisco, Helenilson Pereira dos Santos, Robson de Andrade Souza, Júlia Maria D'Andréa Greve and Emmanuel Gomes Ciolac

performance of muscle capacity tests, it is known that physical exercise programs, specifically resistance training, promote the improvement of this variable in individuals with KOA. For example, a resistance training program conducted twice a week for 13 weeks resulted in improvements in sit-up and chair

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Amador García-Ramos, Alejandro Torrejón, Alejandro Pérez-Castilla, Antonio J. Morales-Artacho and Slobodan Jaric

muscle capacities have been typically conducted under a single mechanical condition. 7 However, a single loading-condition test does not enable selective assessment of the maximal force-, velocity-, and power-producing capacities of the muscles (see Jaric 7 , 8 for a review). The solution occasionally

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Amador García-Ramos and Slobodan Jaric

: 60 – 64 . PubMed ID: 28501023 doi:10.1016/j.gaitpost.2017.04.033 10.1016/j.gaitpost.2017.04.033 28501023 21. García-Ramos A , Torrejón A , Morales-Artacho A , Pérez-Castilla A , Jaric S . Optimal resistive forces for maximizing the reliability of leg muscles capacities tested on a