Effects of high-frequency initial pulses and posttetanic potentiation on power output of skeletal muscle

Abbate, F.; Sargeant, A. J.; Verdijk, P. W. L.; Haan, A. de

doi:10.1152/jappl.2000.88.1.35

Cited by 83 publications

(63 citation statements)

References 23 publications

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“…Our results confirm previous results showing an association between RLC phosphorylation and the potentiation of dynamic force and work (Abbate et al, 2000;Grange et al, 1995;Grange et al, 1998;MacIntosh and Bryan, 2002;MacIntosh et al, 2008;Xeni et al, 2011). Moreover, the present results extend these observations by showing that the potentiation of concentric force and work is shortening speed dependent and that eccentric force and work are relatively insensitive to potentiation.…”

Section: Discussionsupporting

confidence: 93%

“…Although single stimulus pulses producing twitch responses (isometric, concentric or eccentric) are not a realistic representation of neural activation in vivo, there is evidence that the influence of activity-dependent potentiation on concentric force is present at both low and high frequencies of stimulation (e.g. Abbate et al, 2000;MacIntosh et al, 2008). That is, it is possible that despite obvious discrepancies in terms of total force magnitude, the relative changes observed at the level of the twitch may be replicated during tetanic contractions.…”

Section: Work Cycle Techniquementioning

confidence: 99%

“…More recent studies, however, demonstrate dynamic muscle function involving muscle shortening, work and power are also subject to modulation by activity-dependent potentiation. Relevant in this regard are studies showing that RLC phosphorylation is associated with increased dynamic force, work and power in both rat and mouse muscle (Abbate et al, 2000;Grange et al, 1995;Grange et al, 1998;MacIntosh and Bryan, 2002;MacIntosh et al, 2008;Xeni et al, 2011). In general, these studies show that the rate and extent of isotonic shortening and/or work/power are enhanced during or following contractile activity that phosphorylates the myosin RLC.…”

Section: Introductionmentioning

confidence: 99%

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The effect of work cycle frequency on the potentiation of dynamic force in mouse fast twitch skeletal muscle

Caterini

Gittings

Vandenboom

2011

Journal of Experimental Biology

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SUMMARYThe purpose of this study was to test the hypothesis that the potentiation of concentric twitch force during work cycles is dependent upon both the speed and direction of length change. Concentric and eccentric forces were elicited by stimulating muscles during the shortening and lengthening phases, respectively, of work cycles. Work cycle frequency was varied in order to vary the speed of muscle shortening and/or lengthening; all forces were measured as the muscle passed though optimal length (L o ). Both concentric and eccentric force were assessed before (unpotentiated control) and after (potentiated) the application of a tetanic conditioning protocol known to potentiate twitch force output. The influence of the conditioning protocol on relative concentric force was speed dependent, with forces increased to 1.19±0.01, 1.25±0.01 and 1.30±0.01 of controls at 1.5, 3.3 and 6.9Hz, respectively (all data N9-10 with P<0.05). In contrast, the conditioning protocol had only a limited effect on eccentric force at these frequencies (range: 1.06±0.01 to 0.96±0.03). The effect of the conditioning protocol on concentric work (force ϫ distance) was also speed dependent, being decreased at 1.5Hz (0.84±0.01) and increased at 3.3 and 6.9Hz (1.05±0.01 and 1.39±0.01, respectively). In contrast, eccentric work was not increased at any frequency (range: 0.88±0.02 to 0.99±0.01). Thus, our results reveal a hysteresis-like influence of activity-dependent potentiation such that concentric force and/or work were increased but eccentric force and/or work were not. These outcomes may have implications for skeletal muscle locomotor function in vivo.

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Section: Discussionsupporting

confidence: 93%

Section: Work Cycle Techniquementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The effect of work cycle frequency on the potentiation of dynamic force in mouse fast twitch skeletal muscle

Caterini

Gittings

Vandenboom

2011

Journal of Experimental Biology

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“…Pilot experiments showed that such tetanic contractions yield a high level of potentiation without significant fatigue (see also Abbate et al, 2000). Potentiation remained constant for more than 20·s and had vanished after 15·min.…”

Section: Experimental Muscle Lengthmentioning

confidence: 91%

Low-frequency fatigue, post-tetanic potentiation and their interaction at different muscle lengths following eccentric exercise

Rijkelijkhuizen

Ruiter

Huijing

et al. 2005

Journal of Experimental Biology

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“…PAP is related in principle to phosphorylation of the myosin regulatory light chain, which is induced by an increase in the sensitivity to Ca 2+ of myofilaments 3) . The increased twitch force is observed when a muscle is activated by low-frequency stimulation 1,4) , because high-frequency contraction induces Ca 2+ accumulation, which reaches a saturation point and thus causing Ca 2+ sensitivity to become inconsequential 5) .…”

Section: Introductionmentioning

confidence: 99%

Changes in Electromyographic Activity after Conditioning Contraction

et al. 2012

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Abstract.[Purpose] Post-activation potentiation is the increase in muscle twitch force in response to electrical stimulation after a conditioning contraction (CC) of maximum or near-maximum intensity. It is controversial whether muscular force during low-level voluntary contractions increases after maximum contraction. This study investigated the changes in electromyographic activity after CC. [Subjects and Methods] Fifteen healthy adults participated in this study. In the first experiment, a supramaximal electrical pulse was applied to the tibial nerve, and the isometric twitch force of plantar flexion was measured. After maximum voluntary contraction (MVC), i.e., CC, the twitch force elicited by electrical stimulation was monitored. In the second experiment, the surface electromyogram were recorded at an intensity of 20% MVC before and after CC. [Results] Results indicated the twitch force significantly increased by 30% within 30 s after CC. In the second experiment, the electromyographic activity significantly decreased by 16% for the gastrocnemius muscle but did not change for the soleus. Correlation coefficients between changes in the twitch force and electromyographic activity at 20%MVC were −0.54 for the gastrocnemius muscle and 0.04 for the soleus muscle.[Conclusion] Post-activation potentiation might work for daily physical activities compensating for reduced force output of the fatigued muscle.

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Effects of high-frequency initial pulses and posttetanic potentiation on power output of skeletal muscle

Cited by 83 publications

References 23 publications

The effect of work cycle frequency on the potentiation of dynamic force in mouse fast twitch skeletal muscle

The effect of work cycle frequency on the potentiation of dynamic force in mouse fast twitch skeletal muscle

Low-frequency fatigue, post-tetanic potentiation and their interaction at different muscle lengths following eccentric exercise

Changes in Electromyographic Activity after Conditioning Contraction

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