Neuromuscular fatigue during maximal concurrent hand grip and elbow flexion or extension

Electromyography of selected lower-limb muscles fatigued by exercise at the intensity of soccer match-play

“…The decrease in muscle activity as a result of fatigue (as the exercise progresses) is in agreement with Oda and Kida [19] who found a significant decrease in RMS values of the biceps brachii muscle following maximal concurrent hand grip and elbow extension. This finding is in contrast to some previous studies which have shown that during exhaustive, repetitive exercise, the amplitude of the EMG increases, e.g., [8,12,18,20,28] and to Miller et al [15], who found no significant differences in RMS activity as the repetitions progressed for any of the quadriceps and hamstring muscles they tested.…”

Monitoring hand flexor fatigue in a 24-h motorcycle endurance race

“…When comparing the NMP and NMPF values across all relays, we were not able to find differences between these two variables. Such results may be in agreement with authors using independently NMF (De Luca, 1997;Eksioglu, 2006;Merletti et al, 1990) or NMPF (Clancy et al, 2008;Moritani et al, 1986;Oda and Kida, 2001) when examining muscle fatigue.…”

“…During the test, the subject was seated, not simply because of the numerous studies reported elsewhere that have selected the sitting position (Bohannon and Schaubert, 2005;Clancy et al, 2008;Eksioglu, 2006;Hanson and Lofthus, 1978;Jaskolska and Jaskolski, 1997;Kamimura and Ikuta, 2001;Louhevaara et al, 2000;Oda and Kida, 2001), but also because we sought to reproduce a position as close as possible to that adopted by the riders when racing. Thus during assessment riders sat with their knees flexed at 90°, their feet flat on the ground, without any back support and with their trunk tilted slightly forward.…”

“…Thus during assessment riders sat with their knees flexed at 90°, their feet flat on the ground, without any back support and with their trunk tilted slightly forward. In the case of the riders' arm position, while some authors prefer medial pronation, with the arm flexed at 90°a nd the thumb pointing upward (Bohannon and Schaubert, 2005;Clancy et al, 2008;Eksioglu, 2006;Hanson and Lofthus, 1978;Oda and Kida, 2001), the present study adopted the recommendations of Jaskolska and Jaskolski (1997), where the subject's arm was flexed, with the forearm in a supinated position reclined over a horizontal support, in combination with a slight shoulder abduction (Kamimura and Ikuta, 2001). This position was preferred so that we could monitor the grip strength exerted by the subject on the handgrip dynamometer.…”

Exertion dependent alternations in force fluctuation and limb acceleration during sustained fatiguing contraction

“…The oscillatory activities can be easily featured with a force-recording device coupled to a strain gauge (Oda and Kida 2001;Durbaba et al 2005) or accelerometers placed on limb segments (McAuley et al 1997;Shinohara et al 2005) that measure force fluctuation (FF) and limb acceleration (LA), respectively. Tremulous movements develop across a wide spectral range, consisting of a low frequency resonance of less than 3 Hz (Christou et al 2004;Kouzaki et al 2004), a 6-12 Hz range of possible central origins (Semmler and Nordstrom 1995;Durbaba et al 2005), and higher spectral components larger than 20 Hz (McAuley et al 1997;Takanokura and Sakamoto 2005).…”