the ability to optimize muscular power output is considered as a basis for successful performance in the most sports. the aim of this study was to investigate changes in dynamic exercise performance following a sequence of preconditioning isometric muscle actions. twelve nonathlete, active female volunteers (age: 16±1 yr, height: 162±6.34 cm, weight: 60±9.21 kg) participated in the present stud...

Because stretch-induced activation may be important in generating clinically relevant arrhythmias in the heart, we delineated the ability of different types of stretches to activate ventricular tissue. Geometrically simple sheets of frog ( Rana catesbeiana) ventricular tissue were mounted to allow stretches to be applied perpendicular to one edge. Every heart could be activated by a stretch pul...

Small insects drive their flight muscle at frequencies up to 1,000 Hz. This remarkable ability owes to the mechanism of stretch activation. However, it remains unknown as to what sarcomeric component senses the stretch and triggers the following force generation. Here we show that the earliest structural change after a step stretch is reflected in the blinking of the 111 and 201 reflections, as...

To define mechanisms regulating expression of cell-cell junction proteins, we have developed an in vitro system in which neonatal rat ventricular myocytes were subjected to pulsatile stretch. Previously, we showed that expression of the gap junction protein, connexin (Cx) 43, is increased by approximately 2-fold after 1 hour of stretch, and this response is mediated by stretch-induced secretion...

Stretch-flangeability measures the ability of a material to form into a complex shape. The parameter is often related to simple properties derived from tensile tests. An attempt is made here to discover the best way to exploit tensile test data to indicate flangeabilty. It is found that the ultimate tensile strength of steel is the single most important criterion that correlates with stretch-fl...

OBJECTIVE Effects of cyclic stretch on endothelial cells are studied usually by exposing cells cultured under stretch-free conditions to some levels of cyclic stretch, but in vivo these cells experience both increase and decrease in stretch. Experiments were designed to study how endothelial cells maintained under certain levels of cyclic stretch responded to shifts in stretch frequencies and a...

The currently ongoing NIST LWC project aims at identifying new standardization targets for lightweight authenticated encryption with associated data (AEAD) and (optionally) cryptographic hashing. has deemed it important performance cost to be optimized on relevant platforms, especially short messages. Reyhanitabar, Vaudenay Vizár (Asiacrypt 2016) gave a formal treatment security of nonce-based ...