The relationship between flexibility and EMG activity pattern of the erector spinae muscles during trunk flexion–extension

Compensatory behavior of the postural control system to flexion–relaxation phenomena

“…The deep flexion was held for 4 s followed by 3e5 s extension to upright posture, and then static standing through the end of recording. Finally one of the trials was chosen depending on signal quality for data analysis (Hashemirad et al, 2009).…”

Factors affecting the risk of developing lower back musculoskeletal disorders (MSDs) in experienced and inexperienced rodworkers

“…Previous research has shown that individuals with higher flexibility are able to turn off the muscles under tension during a stretch. For instance, Hashemirad et al (2009) reported that individuals with higher scores in a touch-toe flexibility test were able to relax their erector spinae muscles while in large trunk flexion angles, while those with lower scores did not. It is probable that increased flexibility in our experienced group was a noteworthy contributor to their ability to remain in trunk flexion for longer, by allowing them to relax their back during tying.…”

Flexion relaxation of erector spinae response to spinal shrinkage

“…A threshold level, 5% of the peak value of MAV of ES, obtained during all of the trials for both conditions was used to initially determine the beginning and the ending of the myoelectric activity (Olson et al, 2006;Hashemirad et al, 2009).…”