Changes in force, surface and motor unit EMG during post-exercise development of low frequency fatigue in vastus lateralis muscle

Ruiter, C.J. de; Elzinga, Matthijs J.; Verdijk, P. W. L.; Mechelen, Willem van; Haan, A. de

doi:10.1007/s00421-005-1356-x

Cited by 40 publications

(48 citation statements)

References 35 publications

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“…However, neither the EMG amplitude of the two muscles nor the voluntary torque recovered fully to the pre-fatigue values at 5 min post-fatigue, indicating that either the increased motor unit discharge rates were not enough or LFF was so severe that it could not be compensated fully by neural strategies. Moreover, an increase in motor unit discharge rates after LFF was not detected in surface EMG amplitudes but was detected with fine wire recordings (De Ruiter et al, 2005). Therefore, observing significantly depressed surface EMG amplitude after fatigue does not necessarily mean that motor unit discharge rates did not increase in the present study.…”

Section: Voluntary Torque Emg Activities and Lff After Fatiguementioning

confidence: 46%

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Low frequency fatigue in human quadriceps is fatigue dependent and not task dependent

Iguchi

Baldwin

Boeyink

et al. 2008

Journal of Electromyography and Kinesiology

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It is well accepted that a low intensity/long duration isometric contraction induces more low frequency fatigue (LFF) compared to a high-intensity/short-duration contraction. However, previous reports examined the intensity/duration of the contraction but did not control the level of fatigue when concluding fatigue is task dependent. The purpose of this study was to determine whether a long duration/low intensity fatiguing contraction would induce greater LFF than a short duration/ high-intensity contraction when the quadriceps muscle was fatigued to similar levels. Eighteen healthy male subjects performed quadriceps contractions sustained at 35% and 65% of maximal voluntary contraction (MVC) on separate days, until the tasks induced a similar amount of fatigue (force generating capacity = 45% MVC). Double pulse torque to single pulse torque ratio (D/S ratio) was obtained before, immediately and 5 min after fatigue along with the electromyographic (EMG) signal from vastus medialis (VM) and rectus femoris (RF). The D/S ratio significantly (p < 0.05) increased by 8.7 ± 8.5% (mean ± SD) and 10.2 ± 9.2% after 35% and 65% tasks, respectively, and remained elevated 5 min into recovery; however, there was no significant difference in ratio between the two sessions immediately or 5 min post-fatigue (p > 0.05) even though the endurance time for the 35% fatigue task (124 ± 39.68 s) was significantly longer (p = 0.05) than that of the 65% task (63 ± 17.73 s). EMG amplitude and median power frequency (MPF) analysis also did not reveal any significant differences between these two sessions after fatigue. These findings indicate that LFF fatigue is fatigue dependent as well as task intensity/duration dependent. These findings assist us in understanding task dependency and muscle fatigue.

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Section: Voluntary Torque Emg Activities and Lff After Fatiguementioning

confidence: 46%

“…De Ruiter et al (2005) found an increase in motor unit discharge rates of the human vastus lateralis muscle after LFF was induced. This compensation of E-C coupling failure may have occurred in the present study when subjects performed the MVC after fatigue.…”

Section: Voluntary Torque Emg Activities and Lff After Fatiguementioning

confidence: 87%

Low frequency fatigue in human quadriceps is fatigue dependent and not task dependent

Iguchi

Baldwin

Boeyink

et al. 2008

Journal of Electromyography and Kinesiology

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“…The twitch time scale is well known to be slowed immediately after fatigue, but this also recovers within 3 min and is replaced by a very small speeding of the twitch for the duration of the low-frequency fatigue (6,11). Finally, the 50-Hz response itself is slightly depressed during long-lasting fatigue (11,13). Taken together, this suggests that the twitch response is an effective and sensitive index of long-term fatigue (22).…”

Section: Discussionmentioning

confidence: 91%

“…Postactivation potentiation can indeed produce large increases in twitch force (15,32), but there is a rapid recovery largely complete within 3 min. The twitch time scale is well known to be slowed immediately after fatigue, but this also recovers within 3 min and is replaced by a very small speeding of the twitch for the duration of the low-frequency fatigue (6,11). Finally, the 50-Hz response itself is slightly depressed during long-lasting fatigue (11,13).…”

Section: Discussionmentioning

confidence: 99%

“…However, it was recently found that, in response to short maximal isometric contractions, low-frequency fatigue developed between 3 and 9 min after the exercise (11). Thus, to achieve a faster time resolution, long-lasting fatigue is measured here using a protocol of 1) a brief period of maximal exercise and 2) frequent single-shock test stimuli, rather than the ratio of low-to high-frequency stimulation normally used to characterize lowfrequency fatigue.…”

mentioning

confidence: 99%

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Fatigue and functional performance of human biceps muscle following concentric or eccentric contractions

Smith¹,

Newham²

2007

Journal of Applied Physiology

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Smith ICH, Newham DJ. Fatigue and functional performance of human biceps muscle following concentric or eccentric contractions. J Appl Physiol 102: 207-213, 2007. First published September 21, 2006; doi:10.1152/japplphysiol.00571.2006.-A long-lasting fatigue was measured in human biceps muscle, following 40 maximal isokinetic concentric or eccentric contractions of the forearm, as the response to single-shock stimuli every minute for 4 h. This protocol allowed new observations on the early time course of long-lasting fatigue. Concentric contractions induced a novel progressive decline to 30.2% (SE 7.8, n ϭ 7) of control at 23 min with complete recovery by 120 min. Eccentric contractions lead initially to a smaller force reduction of similar time course followed by a slower decline to 40.0% (SE 5.1, n ϭ 7) control at 120 min with recovery less than half complete at 4 h. A 50-Hz test stimuli overcame both fatigues, identifying low-frequency fatigue. EMG recordings from the biceps muscle showed moderate (Ͻ20%) changes during the fatigue. A visual-tracking task showed no decrement in performance at the time of maximal fatigue of the single-shock response. Because the eccentric contractions have a similar activation, a larger force, but much smaller metabolic usage than concentric contractions, it is concluded that the initial decline is related to the effects of metabolites, whereas the slower phase after eccentric contractions is associated with higher mechanical stress. skeletal muscle; motor control; skill PERIPHERAL MUSCLE FATIGUE can be both short term, with a simultaneous recovery of force and phosphocreatine largely complete within 1 min (36, 37), and long-lasting, remaining for at least 0.5 h after exercise (13). This later failure to develop tension is seen most clearly using low-frequency test stimuli, thus the nomenclature of low-frequency fatigue (19). It remains long after metabolic recovery and is associated with reduced calcium release per action potential (8, 9). In addition, it has long been recognized that high-intensity eccentric contractions give rise to further force reduction that lasts several days and is associated with muscle damage (30,29,35), although the mechanisms for the initial decline in force are still uncertain (2, 31). In this paper, which studies force reduction for up to 4 h after brief but intense fatiguing concentric or eccentric exercise, we refer to the force reduction by either protocol as fatigue. The time scale of the development of long-lasting fatigue remains unclear because it has been experimentally lost either by using a long period of fatiguing exercise or through infrequent test measurements of the degree of fatigue. Normally, the fatigue is shown as having developed by the first measurement point, leading to the assumption that it develops during the fatiguing exercise. However, it was recently found that, in response to short maximal isometric contractions, low-frequency fatigue developed between 3 and 9 min after the exercise (11). Thus, to achieve a faster time...

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Quadriceps low‐frequency fatigue and muscle pain are contraction‐type‐dependent

Iguchi

Shields

2010

Muscle and Nerve

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Changes in force, surface and motor unit EMG during post-exercise development of low frequency fatigue in vastus lateralis muscle

Cited by 40 publications

References 35 publications

Low frequency fatigue in human quadriceps is fatigue dependent and not task dependent

Low frequency fatigue in human quadriceps is fatigue dependent and not task dependent

Fatigue and functional performance of human biceps muscle following concentric or eccentric contractions

Quadriceps low‐frequency fatigue and muscle pain are contraction‐type‐dependent

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