June 1, 1992Acta Physiologica Scandinavica

Is the mean power frequency shift of the EMG a selective indicator of fatigue of the fast twitch motor units?

Q: What is the clinical evidence from this study?

Population: Healthy (n=10). Intervention: Hypoxia (relative ischaemia) induced by tourniquet vs. Normoxia (pre-hypoxia contractions). Primary outcome: Mean power frequency (MPF) of the EMG.

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Key result

Inducing hypoxia during repeated maximum isokinetic contractions decreased mechanical performance and EMG amplitude without significantly decreasing mean power frequency.

Population

10 healthy women

Comparison

Repeated isokinetic plantar flexions with… vs Baseline contractions before hypoxia, and a…

Authors

BGBjörn GerdleLinköping University AFAxel R. Fugl‐MeyerUmeå University

Discussion

Member takes

Implication

Hypoxia impairs performance and EMG amplitude without MPF shift; leaves open MPF sensitivity to type 1 fiber hypoxia.

Structured PICO

Population

10 healthy women undergoing repeated isokinetic plantar flexions to evaluate EMG mean power frequency shifts during induced hypoxia.

Intervention

Repeated isokinetic plantar flexions with induced relative ischaemia (hypoxia) using a tourniquet

Comparator

Baseline contractions before hypoxia, and a submaximum test without hypoxia

Outcome

Mean power frequency (MPF) of the electromyogram (EMG), mechanical performance output, and signal amplitude (RMS)surrogate

The MPF shift of the EMG is mainly sensitive to biochemical changes in type 2 muscle fibres, and does not detect hypoxia mainly located in type 1 fibres.

Cite This Study

Gerdle et al. (1992) studied Healthy (n=10). Hypoxia (relative ischaemia) induced by tourniquet vs. Normoxia (pre-hypoxia contractions) was evaluated on Mean power frequency (MPF) of the EMG. Inducing hypoxia during repeated maximum isokinetic contractions decreased mechanical performance and EMG amplitude without significantly decreasing mean power frequency.

synapsesocial.com/papers/6a99a8738ad511aa02da6cf9 https://doi.org/10.1111/j.1748-1716.1992.tb09348.x

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Is the mean power frequency shift of the EMG a selective indicator of fatigue of the fast twitch motor units?

Discussion

Member takes

Implication

Structured PICO

Cite This Study

Is the mean power frequency shift of the EMG a selective indicator of fatigue of the fast twitch motor units?

Discussion

Member takes

Implication

Structured PICO

Cite This Study

Also Consider

Also Consider