{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,23]],"date-time":"2026-01-23T22:46:59Z","timestamp":1769208419555,"version":"3.49.0"},"reference-count":23,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2014,7,10]],"date-time":"2014-07-10T00:00:00Z","timestamp":1404950400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>A real-time muscle fatigue monitoring system was developed to quantitatively detect the muscle fatigue of subjects during cycling movement, where a fatigue progression measure (FPM) was built-in. During the cycling movement, the electromyogram (EMG) signals of the vastus lateralis and gastrocnemius muscles in one leg as well as cycling speed are synchronously measured in a real-time fashion. In addition, the heart rate (HR) and the Borg rating of perceived exertion scale value are recorded per minute. Using the EMG signals, the electrical activity and median frequency (MF) are calculated per cycle. Moreover, the updated FPM, based on the percentage of reduced MF counts during cycling movement, is calculated to measure the onset time and the progressive process of muscle fatigue. To demonstrate the performance of our system, five young healthy subjects were recruited. Each subject was asked to maintain a fixed speed of 60 RPM, as best he\/she could, under a constant load during the pedaling. When the speed reached 20 RPM or the HR reached the maximal training HR, the experiment was then terminated immediately. The experimental results show that the proposed system may provide an on-line fatigue monitoring and analysis for the lower extremity muscles during cycling movement.<\/jats:p>","DOI":"10.3390\/s140712410","type":"journal-article","created":{"date-parts":[[2014,7,10]],"date-time":"2014-07-10T11:22:59Z","timestamp":1404991379000},"page":"12410-12424","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":25,"title":["A Real-Time Fatigue Monitoring and Analysis System for Lower Extremity Muscles with Cycling Movement"],"prefix":"10.3390","volume":"14","author":[{"given":"Szi-Wen","family":"Chen","sequence":"first","affiliation":[{"name":"Department of Electronic Engineering, Chang Gung University, Taoyuan 333, Taiwan"},{"name":"Healthy Aging Research Center (HARC), Chang Gung University, Taoyuan 333, Taiwan"}]},{"given":"Jiunn-Woei","family":"Liaw","sequence":"additional","affiliation":[{"name":"Healthy Aging Research Center (HARC), Chang Gung University, Taoyuan 333, Taiwan"},{"name":"Department of Mechanical Engineering, Chang Gung University, Taoyuan 333, Taiwan"}]},{"given":"Hsiao-Lung","family":"Chan","sequence":"additional","affiliation":[{"name":"Healthy Aging Research Center (HARC), Chang Gung University, Taoyuan 333, Taiwan"},{"name":"Department of Electrical Engineering, Chang Gung University, Taoyuan 333, Taiwan"}]},{"given":"Ya-Ju","family":"Chang","sequence":"additional","affiliation":[{"name":"Healthy Aging Research Center (HARC), Chang Gung University, Taoyuan 333, Taiwan"},{"name":"Department of Physical Therapy and the Graduate Institute of Rehabilitation Science, College of Medicine, Chang Gung University, Taoyuan 333, Taiwan"}]},{"given":"Chia-Hao","family":"Ku","sequence":"additional","affiliation":[{"name":"Department of Electronic Engineering, Chang Gung University, Taoyuan 333, Taiwan"}]}],"member":"1968","published-online":{"date-parts":[[2014,7,10]]},"reference":[{"key":"ref_1","first-page":"147","article-title":"Skeletal muscle weakness and fatigue in old age: Underlying mechanisms","volume":"10","author":"Faulkner","year":"1990","journal-title":"Annu. 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