Task-Dependent Factors in Fatigue of Human Voluntary Contractions

Bigland-Ritchie, B.; Rice, Charles L.; Garland, S. Jayne; Walsh, M.L.

doi:10.1007/978-1-4899-1016-5_29

Cited by 132 publications

(104 citation statements)

References 75 publications

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“…Previous investigators have suggested that preexercise differences in muscular strength (and, by inference, muscle size) may explain enhanced fatigue resistance with age, presumably due to less occlusion of blood flow during contractions in smaller muscle (3,8). However, we found that, during the isometric protocol, the relationship between preexercise muscular strength and fatigue could account for only 21% of the variability in fatigue.…”

Section: Torque Power and Fatiguecontrasting

confidence: 54%

“…The extent of these age-related alterations appears to vary by muscle group and level of habitual physical activity (3,21,30). The impact of these various alterations may depend on the motor task used to evaluate fatigue (8). From a functional standpoint, maintaining successful independent living with increasing age requires the repeated use of both isometric and dynamic contractions, yet few data are available that provide a reasonably direct comparison of fatigue during these two types of contraction in older adults.…”

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confidence: 99%

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Age-related enhancement of fatigue resistance is evident in men during both isometric and dynamic tasks

Lanza

Russ

Kent‐Braun

2004

Journal of Applied Physiology

149

119

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It has been suggested that the effects of old age on the ability to resist fatigue may be task dependent. To test one aspect of this hypothesis, we compared the neuromuscular responses of nine young (26 +/- 4 yr, mean +/- SD) and nine older (72 +/- 4 yr) healthy, relatively sedentary men to intermittent isometric (3 min, 5 s contract/5 s rest) and dynamic (90 at 90 degrees /s) maximum voluntary contractions (MVC) of the ankle dorsiflexor muscles. To assess the mechanisms of fatigue (defined as the ratio of postexercise MVC to preexercise MVC), we also measured isometric central activation ratios (CAR), tetanic torque, contractile properties, and compound muscle action potentials before and immediately after exercise. Because dynamic contractions are more neurally complex and metabolically demanding than isometric contractions, we expected an age-related fatigue resistance observed during isometric exercise to be absent during dynamic exercise. In contrast, older men (O) fatigued less than young (Y) during both isometric (O = 0.77 +/- 0.07, Y = 0.66 +/- 0.02, mean +/- SE; P < 0.01) and dynamic (O = 0.45 +/- 0.07, Y = 0.27 +/- 0.02; P = 0.04) contractions (ratio of postexercise to preexercise MVC), with no evidence of peripheral activation failure in either group. We observed no obvious limitations in central activation in either group, as assessed using isometric CAR methods, after both isometric and dynamic contractions. Preexercise half-time of tetanic torque relaxation, which was longer in O compared with Y, was linearly associated with fatigue resistance during both protocols (r = 0.62 and 0.66, P < or = 0.004, n = 18). These results suggest that relative fatigue resistance is enhanced in older adults during both isometric and isokinetic contractions and that age-related changes in fatigue may be due largely to differences within the muscle itself.

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Section: Torque Power and Fatiguecontrasting

confidence: 54%

mentioning

confidence: 99%

Age-related enhancement of fatigue resistance is evident in men during both isometric and dynamic tasks

Lanza

Russ

Kent‐Braun

2004

Journal of Applied Physiology

149

119

View full text Add to dashboard Cite

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“…However, Harvard step exercise-induced fatigue in this study was different; the effects not only were observed immediately following the protocol, but also were seen 24 hours later. Therefore, it is believed that there is specificity in the process of treating exercise-induced fatigue (Cairns, Knicker, Thompson, & Sjøgaard, 2005;Enoka & Stuart, 1992;Bigland-Ritchie, Rice, Garland, & Walsh, 1995).…”

Section: Discussionmentioning

confidence: 99%

Effects of Localized Muscle Fatigue and Whole Body Fatigue on Postural Control during Single-Leg Stance

Youm¹,

Shin²,

Lee³

et al. 2014

Korean Journal of Sport Biomechanics

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The purpose of this study was to investigate the effects of localized muscle fatigue and whole body fatigue on postural control during single-leg stance after impairment induced by heel raise and the Harvard step test. Thirty-eight university students (19 men: age, 20 ) were participated in this study. Subjects performed a series of single-leg postural tasks prior to, following, and 24 hours after completing: heel raise or the Harvard step test. This study showed that the root mean squared distance and velocity in the anteroposterior and mediolateral planes of the center of pressure decreased significantly due to heel raise exercise-induced fatigue. Furthermore, the root mean squared distance in the anteroposterior and mediolateral planes, and the 95% confidence ellipse area of the center of pressure also decreased significantly 24 hours after completing the Harvard step test. In conclusion, this study showed that both heel raise exercise-and Harvard step exercise-induced fatigue affects postural control during single-leg stance in AP and ML planes. Furthermore, this study suggests that changes in the postural control strategy may have occurred after the fatigue protocols during single-leg stance. Also vision can attenuate the postural deficits associated with the fatigues. In order to clarify these results, further studies using other equipment and variables are necessary.

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“…This should lead to an increased rate of entry of tryptophan into the brain, and thus to a higher 5-HT level, which may lead to central fatigue (Blomstrand et al 1995). Central fatigue may be an important factor in chronic fatigue syndrome, in which muscle function is normal (Bigland-Ritchie et al 1995). An increase in plasma free tryptophan would lead to an increase in the plasma concentration of free tryptophan/branched chain amino acids (BCAA), which compete with tryptophan for entry into the brain across the blood-brain barrier.…”

Section: Po Box 147 Liverpool L69 3bxmentioning

confidence: 99%

Human Physiology Recension

1998

The Journal of Physiology

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Task-Dependent Factors in Fatigue of Human Voluntary Contractions

Cited by 132 publications

References 75 publications

Age-related enhancement of fatigue resistance is evident in men during both isometric and dynamic tasks

Age-related enhancement of fatigue resistance is evident in men during both isometric and dynamic tasks

Effects of Localized Muscle Fatigue and Whole Body Fatigue on Postural Control during Single-Leg Stance

Human Physiology Recension

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