Ischemia sensitivity and motoneuron afterhyperpolarization in human motor units

Gossen, E. Roderich; Ivanova, Tanya D.; Garland, S. Jayne

doi:10.1002/mus.20083

Cited by 4 publications

(2 citation statements)

References 37 publications

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“…Since contraction-related ischaemia can be considered comparable between our two groups of athletes, and since slow motor units have a greater sensitivity to ischaemia than fast motor units (Gossen, Ivanova, & Garland, 2004), our findings also suggest that the estimation of conduction velocity overshooting may be used to distinguish participants with different muscular properties.…”

Section: Myoelectric Responses To Exercisementioning

confidence: 92%

Mechanical and EMG responses of the vastus lateralis and changes in biochemical variables to isokinetic exercise in endurance and power athletes

Rainoldi

Gazzoni

Merletti

et al. 2008

Journal of Sports Sciences

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Twelve endurance athletes and six power athletes performed fatiguing isokinetic knee flexions/extensions. Isokinetic torque was recorded during the exercise. Isometric torque, cortisol and lactate responses, electromyographic (EMG) mean power frequency, average rectified value, and conduction velocity were analysed before and after the isokinetic exercise to determine correlations between electrophysiological variables and mechanical performances and/or blood concentrations of biomarkers in the two groups of athletes. The EMG variables were estimated from signals recorded from the vastus lateralis in both voluntary and electrically elicited isometric contractions. Power athletes recorded higher values than endurance athletes for the following variables: pre-exercise isometric maximal voluntary contraction (MVC), isokinetic MVC, rate of mechanical fatigue during isokinetic contractions, pre -post exercise variations and recovery times of conduction velocity and mean power frequency, and lactate concentrations. Moreover, conduction velocity overshooting was observed in endurance athletes during the recovery phase after exercise. The correlation analyses showed that the higher the rate of mechanical fatigue, the higher the lactate production and the reduction in conduction velocity due to the exercise.

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Section: Myoelectric Responses To Exercisementioning

confidence: 92%

Mechanical and EMG responses of the vastus lateralis and changes in biochemical variables to isokinetic exercise in endurance and power athletes

Rainoldi

Gazzoni

Merletti

et al. 2008

Journal of Sports Sciences

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show abstract

“…Nevertheless, studies on rat muscles have shown a greater decline in twitch force in slow muscle than in fast muscle during the first 45 minutes of ischemia, particularly during the first 15‐30 minutes . Likewise, Gossen et al reported markedly greater declines in twitch force in slow contracting motor units than in fast units during very low‐force (~5%‐10% of MVC) voluntary ischemic contractions in human subjects.…”

Section: Fatigue and Recovery In The Muscle Fibre Types With Ischemicmentioning

confidence: 99%

Muscle fibre activation and fatigue with low‐load blood flow restricted resistance exercise—An integrative physiology review

Wernbom

Aagaard

2019

Acta Physiologica

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Blood flow-restricted resistance exercise (BFRRE) has been shown to induce increases in muscle size and strength, and continues to generate interest from both clinical and basic research points of view. The low loads employed, typically 20%-50% of the one repetition maximum, make BFRRE an attractive training modality for individuals who may not tolerate high musculoskeletal forces (eg, selected clinical patient groups such as frail old adults and patients recovering from sports injury) and/or for highly trained athletes who have reached a plateau in muscle mass and strength. It has been proposed that achieving a high degree of muscle fibre recruitment is important for inducing muscle hypertrophy with BFRRE, and the available evidence suggest that fatiguing low-load exercise during ischemic conditions can recruit both slow (type I) and fast (type II) muscle fibres. Nevertheless, closer scrutiny reveals that type II fibre activation in BFRRE has to date largely been inferred using indirect methods such as electromyography and magnetic resonance spectroscopy, while only rarely addressed using more direct methods such as measurements of glycogen stores and phosphocreatine levels in muscle fibres. Hence, considerable uncertainity exists about the specific pattern of muscle fibre activation during BFRRE. Therefore, the purpose of this narrative review was (1) to summarize the evidence on muscle fibre recruitment during BFRRE as revealed by various methods employed for determining muscle fibre usage during exercise, and (2) to discuss reported findings in light of the specific advantages and limitations associated with these methods. K E Y W O R D Sfatigue, ischemia, motor units, muscle hypertrophy, occlusion 4 of 48 | WERNBOM aNd aaGaaRd 3.5.), which in turn can raise the recruitment threshold of the highest threshold units (discussed in Section 3.4.). As a result, the approximate upper limit for motor unit recruitment during more normal and physiologically relevant contraction durations (eg, 1-3 seconds) remains to be fully defined.

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Differential Diagnosis and Management of Masticatory Myogenous Pain and Dysfunction

Clark¹

2012

Orofacial Pain

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Ischemia sensitivity and motoneuron afterhyperpolarization in human motor units

Cited by 4 publications

References 37 publications

Mechanical and EMG responses of the vastus lateralis and changes in biochemical variables to isokinetic exercise in endurance and power athletes

Mechanical and EMG responses of the vastus lateralis and changes in biochemical variables to isokinetic exercise in endurance and power athletes

Muscle fibre activation and fatigue with low‐load blood flow restricted resistance exercise—An integrative physiology review

Differential Diagnosis and Management of Masticatory Myogenous Pain and Dysfunction

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