Characterization of Inertial and Electromyographic signals for physical fatigue estimation in anaerobic exercise
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Tello Urrea, Andrés Felipe | 2021
Introduction: According to the World Health Organization, Cardiovascular diseases
are the most significant non-communicable diseases worldwide level, with approximately
17.9 million deaths per year. To decrease the impact after a cardiovascular episode,
cardiac rehabilitation is a Class I recommendation. However, to achieve a successful
cardiac rehabilitation program, it is important to measure a variety of parameters that can
facilitate data analysis and interpretation of the effort performed. Providing experts with
relevant data about the patient allows them to guide a safe and optimized rehabilitation
process.
Objective: The continuous monitoring of physical fatigue during cardiac rehabilitation
leads to a safer protocol. However, there is a lack of objective and non-invasive
measures for this parameter, mainly, in protocols based on high-intensity exercise. The
main purpose of this study was the characterization of relevant features for fatigue detection,
obtained from objective measurements such as inertial and electromyographic
signals.
Methodology: In the experimental process, 21 healthy subjects performed Highintensity
interval training to record kinematic, electromyography (EMG), and Borg scale
data, the data was obtained from the biceps femoral and gastrocnemius muscles. From
the feature extraction, the data were classified based on the Borg scale and compared
between fatigue levels.
Results: It was observed that most of the features obtained indicate a relationship
with fatigue. As expected some features had a better differentiation between fatigue
levels. However, despite that the results showed a correlation with the knowledge
obtained from the state of the art, the behavior of the mean frequency from the electromyography
signal was the opposite of the data reported.
Conclusions: It was concluded that the features extracted were representative
of the differentiation of three fatigue levels and new insights of the fatigue characterization
during high-intensity exercise was obtained. However, more investigations are imperative
to corroborate the results, additionally, a clinical environment with cardiac rehabilitation
patients is still needed.
LEER