Impact of Stretch-Shortening Cycle Rest Interval on in Vivo Muscle Performance

Abstract

SSC conducted at shorter work-rest cycles resulted in a more profound isometric force decrement 48 h postexposure, and in real-time changes in isometric prestretch force and positive work. These results indicate that short rest intervals between athletic or vocational tasks of heightened physical exertion (i.e., high intensity) may adversely affect performance and increase injury susceptibility.

Proapoptotic factor Bax is increased in satellite cells in the tibialis anterior muscles of old rats

“…3A-D). These morphological changes are indicative of SSC-induced muscle injury 4,11 and suggest that the tissue disruption caused by SSC exposure was similar in young and old rats, except that old rats were still exhibiting edema 10 days after the injury and young rats were not.…”

National occupational research agenda (NORA) future directions in occupational musculoskeletal disorder health research

“…Third, our understanding of tolerance limits to biomechanical load has improved significantly through the use of in vitro and in vivo animal models and finite element modeling techniques (Callaghan and McGill, 2001;Lotz and Chin, 2000;Natarajan et al, 1994;Panjabi et al, 1985;Rempel and Abrahamsson, 2001; Shirazi-Adl, 1991; Videman et al, 1990; Cutlip et al, 2004Cutlip et al, , 2005Cutlip et al, , 2006; Barr and Barbe, 2004;Barbe and Barr, 2006;Barbe et al, 2003;Baker et al, 2006aBaker et al, ,b, 2007Geronilla et al, 2003). We have begun to understand the tissue deterioration process due to occupational loading (Adams, 1988;Adams et al, 2000;Callaghan and McGill, 2001;Hutton et al, 2000;Lotz and Chin, 2000;Natarajan et al, 1994;ViikariJuntura and Silverstein, 1999;Barr and Barbe, 2004).…”

“…This field of inquiry will help elucidate the factors that produce acute (Hunter and Faulkner, 1997;Cutlip et al, 2004Cutlip et al, , 2005Baker et al, 2007;Faulkner et al, 1989;Geronilla et al, 2003) and chronic Barbe et al, 2003) soft tissue injury, characterize the resultant physiological response due to injurious mechanical exposure (Geronilla et al, 2003;Baker et al, 2006aBaker et al, , b, 2007Krajnak et al, 2006), and describe the reparative mechanisms that result after tissue injury (Lapointe et al, 2002a, b;Peterson et al, 2003;Rabinovsky et al, 2003;Sheehan and Allen, 1999;Trappe et al, 2001Trappe et al, , 2002. Improvements in pathomechanics have allowed better understanding of the response of tissues to repeated mechanical exposures .…”

Injury and adaptive mechanisms in skeletal muscle

“…Thus, shorter rest times between contractions can have a deleterious effect due to higher levels of cytosolic calcium and the inability of the muscle to buffer those levels. Thus, both high repetition rates with short rest periods and high force exertions in labor-intensive occupations, as well as prolonged high-intensity strength training practices, could be deleterious to muscle function and increase injury susceptibility (Cutlip et al, 2005). Thus, the work-rest cycle needs to be appropriate to the type of exposure, whether high-intensity or high repetition, to reduce injury susceptibility.…”