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- W3202919323 abstract "Purpose : Reported relationships between electromyographic (EMG) thresholds and systemic thresholds based on lactate, ventilation, or heart rate are contradictory. This might be related to the complexity of the investigated whole-body movements involving many muscles with different activation patterns. Therefore, the aim of the study was to investigate these relationships during an incremental single-joint exercise. Methods : Eighteen male subjects (29.7 [4.4] y) performed single-arm elbow flexions on a biceps curl machine with loads increasing every minute until exhaustion. EMG signals of the main elbow flexors (short and long head of the biceps brachii, flexor carpi radialis, and brachioradialis) as well as gas exchange variables, blood lactate concentration, and heart rate were measured, and 2 turn points based on a 3-phase model of metabolism were determined for each variable. Results : The first and second turn points for EMG were determined at 32.0% to 33.1% and 64.4% to 66.5% of maximal achieved performance (maximum weight), respectively. Systemic turn points were determined at 33.3% to 34.4% and 65.9% to 66.7% of maximum weight and were not significantly different from EMG turn points. Furthermore, systemic and EMG turn points showed a strong or very strong relationship at the first ( ρ = .54–.93, P < .05) and second turn point ( ρ = .76–.93, P < .01). Conclusions : A close relationship between EMG and systemic turn points could be confirmed for the applied movement of a small muscle group. The determination of local single muscle thresholds using EMG provides additional muscle-specific information about performance-limiting properties of muscles involved in endurance-type incremental exercise." @default.
- W3202919323 created "2021-10-11" @default.
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- W3202919323 date "2021-01-01" @default.
- W3202919323 modified "2023-09-25" @default.
- W3202919323 title "Electromyographic and Systemic Physiological Thresholds in Single-Joint Elbow Flexion Movements" @default.
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- W3202919323 doi "https://doi.org/10.1123/ijspp.2021-0163" @default.
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