An Innovative Ergometer to Measure Neuromuscular Fatigue Immediately after Cycling

Doyle-Baker, Douglas; Temesi, John; Medysky, Mary E.; Holash, R. John; Millet, Guillaume Y.

doi:10.1249/mss.0000000000001427

Cited by 76 publications

(65 citation statements)

References 46 publications

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“…After determining the optimal location of the coil (Doyle‐Baker et al . ), the optimal stimulator intensity was found by calculating the size of VL, RF, BF motor‐evoked potential (MEP) and SIT stimulus response curves. Participants performed brief contractions at 20% maximum voluntary contraction (MVC) when TMS was delivered at 20–80% of TMS output (with 10% increments) in a random order.…”

Section: Methodsmentioning

confidence: 99%

“…Counterweighted single-leg cycling. The counterweighted single-leg cycling exercise and neuromuscular assessments (see below) were carried out on a validated custom-built recumbent electromagnetically-braked cycle ergometer system (Velotron; Racermate Inc., Seattle, WA, USA) (Doyle-Baker et al 2018). The counterweighted single-leg cycling was made possible J Physiol 598.2 by using custom-built pedals that were fitted with a 10 kg weight.…”

Section: Experimental Protocolmentioning

confidence: 99%

“…Neuromuscular variables. The set-up for electromyography (EMG), TMS and peripheral nerve stimulation (PNS) have been described previously by Doyle-Baker et al (2018). Briefly, self-adhesive Ag/AgCl surface electrode pairs (Kendall MediTrace; Covidien LLC, Mansfield, MA, USA) were placed 20 mm apart (centre to centre) at the muscle belly of the vastus lateralis (VL), rectus femoris (RF) and biceps femoris (BF) (Hermens et al 2000).…”

Section: Measurementsmentioning

confidence: 99%

“…This caveat in the literature is further fueled by methodological constrains of previous investigations, such as 15–120 s delay in post‐fatigue assessment, which could have resulted in an underestimation of central fatigue (Doyle‐Baker et al . ). There is also little evidence about the responsiveness (i.e.…”

Section: Introductionmentioning

confidence: 97%

“…Indeed, the end-exercise central fatigue (conventionally assessed via twitch interpolated technique) has been either (i) not measured (Bangsbo et al 1996;Nordsborg et al 2003); (ii) not observed after fatiguing tasks (Amann et al 2013;Kennedy et al 2015); or (iii) although present, not different between the control exercise and the exercise preceded by a pre-induced fatigue (Johnson et al 2015). This caveat in the literature is further fueled by methodological constrains of previous investigations, such as 15-120 s delay in post-fatigue assessment, which could have resulted in an underestimation of central fatigue (Doyle-Baker et al 2018). There is also little evidence about the responsiveness (i.e.…”

Section: Introductionmentioning

confidence: 97%

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Effects of pre‐induced fatigue vs. concurrent pain on exercise tolerance, neuromuscular performance and corticospinal responses of locomotor muscles

Aboodarda

Iannetta

Emami

et al. 2020

The Journal of Physiology

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Key points Fatigue and muscle pain induced in a remote muscle group has been shown to alter neuromuscular performance in exercising muscles. Inhibitory neural feedback associated with activation of mechano‐ and metabo‐sensitive muscle afferents has been implicated in this phenomenon. The present study aimed to quantify and compare the effects of pre‐induced fatigue and concurrent rising pain (evoked by muscle ischaemia) on the contralateral leg exercise capacity, neuromuscular performance, and corticomotor excitability and inhibition of knee extensor muscles. Pre‐induced fatigue in one leg had a greater detrimental effect than the concurrent rising pain on the contralateral limb cycling capacity. Furthermore, pre‐induced fatigue, but not concurrent rising pain, reduced corticospinal inhibition recorded from tested contralateral muscles. Regardless of the origin or mechanisms modulating sensory afferents during single‐leg cycling exercise (i.e. pre‐induced fatigue vs. concurrent rising pain), the limit of exercise tolerance remained the same and exercise was terminated upon achievement of a sensory tolerance limit. Abstract Individuals often need to maintain voluntary contractions during high intensity exercise in the presence of fatigue and pain. This investigation examined the effects of pre‐induced fatigue and concurrent rising pain (evoked by muscle ischaemia) in one leg on motor fatigability and corticospinal excitability/inhibition of the contralateral limb. Twelve healthy males undertook four experimental protocols including unilateral cycling to task failure at 80% of peak power output with: (i) the right‐leg (RL); (ii) the left‐leg (LL); (iii) RL immediately preceded by LL protocol (FAT‐RL); and (iv) RL when blood flow was occluded in the contralateral (left) leg (PAIN‐RL). Participants performed maximal and submaximal 5 s right‐leg knee extensions during which transcranial magnetic and femoral nerve electrical stimuli were delivered to elicit motor‐evoked and compound muscle action potentials, respectively. The pre‐induced fatigue reduced the right leg cycling time‐to‐task failure (mean ± SD; 332 ± 137 s) to a greater extent than concurrent pain (460 ± 158 s), compared to RL (580 ± 226 s) (P < 0.001). The maximum voluntary contraction force declined less following FAT‐RL (P < 0.019) and PAIN‐RL (P < 0.032) compared to RL. Voluntary activation declined and the corticospinal excitability recorded from knee extensors increased similarly after the three conditions (P < 0.05). However, the pre‐induced fatigue, but not concurrent pain, reduced corticospinal inhibition compared to RL (P < 0.05). These findings suggest that regardless of the origin and/or mechanisms modulating sensory afferent feedback during single‐leg cycling (e.g. pre‐induced fatigue vs. concurrent rising pain), the limit of exercise tolerance remains the same, suggesting that exercise will be terminated upon achievement of sensory tolerance limit.

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Section: Methodsmentioning

confidence: 99%

Section: Experimental Protocolmentioning

confidence: 99%

Section: Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

See 3 more Smart Citations

Effects of pre‐induced fatigue vs. concurrent pain on exercise tolerance, neuromuscular performance and corticospinal responses of locomotor muscles

Aboodarda

Iannetta

Emami

et al. 2020

The Journal of Physiology

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The validity and reliability of quadriceps twitch force as a measure of skeletal muscle fatigue while cycling

MacDougall,

Aboodarda,

Westergard

et al. 2024

European Journal of Sport Science

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The measurement of skeletal muscle fatigue in response to cycling exercise is commonly done in isometric conditions, potentially limiting its ecological validity, and creating challenges in monitoring the time course of muscle fatigue across an exercise bout. This study aimed to determine if muscle fatigue could be reliably assessed by measuring quadriceps twitch force evoked while pedaling, using instrumented pedals. Nine participants completed three laboratory visits: a step incremental test to determine power output at lactate threshold, and on separate occasions, two constant‐intensity bouts at a power output 10% above lactate threshold. Femoral nerve electrical stimulation was applied to elicit quadriceps twitch force both while pedaling (dynamic) and at rest (isometric). The test–retest reliability of the dynamic twitch forces and the agreement between the dynamic and isometric twitch forces were evaluated. Dynamic twitch force was found to have excellent reliability in an unfatigued state (intraclass correlation coefficient (ICC) = 0.920 and mean coefficient of variation (CV) = 7.5%), and maintained good reliability at task failure (ICC = 0.846 and mean CV = 11.5%). When comparing dynamic to isometric twitch forces across the task, there was a greater relative decline in the dynamic condition (P = 0.001). However, when data were normalized to the 5 min timepoint when potentiation between conditions was presumed to be more similar, this difference disappeared (P = 0.207). The reliability of this method was shown to be commensurate with the gold standard method utilizing seated isometric dynamometers and offers a new avenue to monitor the kinetics of muscle fatigue during cycling in real time.

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Neuronale Anpassungen an Ausdauertraining

Millet,

Temesi

2023

Kombiniertes Ausdauer- Und Krafttraining

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An Innovative Ergometer to Measure Neuromuscular Fatigue Immediately after Cycling

Abstract: The innovative cycling ergometer is a reliable tool to assess NMF during and immediately postexercise. This will allow fatigue etiology during dynamic exercise with large muscle mass to be revisited in various populations and environmental conditions.

Cited by 76 publications

References 46 publications

Effects of pre‐induced fatigue vs. concurrent pain on exercise tolerance, neuromuscular performance and corticospinal responses of locomotor muscles

Effects of pre‐induced fatigue vs. concurrent pain on exercise tolerance, neuromuscular performance and corticospinal responses of locomotor muscles

The validity and reliability of quadriceps twitch force as a measure of skeletal muscle fatigue while cycling

Neuronale Anpassungen an Ausdauertraining

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