TY - JOUR
T1 - Electromyogram median power frequency in dynamic exercise at medium exercise intensities
AU - Ament, Wim
AU - Verkerke, Gijsbertus J.
AU - Bonga, Gerard J.J.
AU - Hof, At L.
PY - 1996/8
Y1 - 1996/8
N2 - The electromyogram (EMG) median power Frequency of the calf muscles was investigated during an exhausting treadmill exercise and a 20-min recovery period. The exercise was an uphill run at a speed of 5 km . h(-1) and a gradient of 20%. During exercise there was no decrease of EMG median power frequency. Tn contrast, EMG median power frequency in isometric contractions of the same muscles decreased by 7% for the soleus muscle and 16 to 18% for gastrocnemius muscles immediately after the exercise, During the recovery period the isometric median power Frequency of the gastrocnemius muscles increased to pre-exercise levels in about 5 min. The isometric median power frequency of the soleus muscle also increased but had not reached pre-exercise values by 20 min. The observations from this study and from a previous uphill treadmill investigation at a steeper gradient ga-cre evidence that two types of exhaustion can be distinguished during dynamic exercise; exhaustion at lower exercise intensities without a decrease in frequency during exercise and exhaustion at high intensities accompanied by a decline of frequency. The reason for this difference remains unclear.
AB - The electromyogram (EMG) median power Frequency of the calf muscles was investigated during an exhausting treadmill exercise and a 20-min recovery period. The exercise was an uphill run at a speed of 5 km . h(-1) and a gradient of 20%. During exercise there was no decrease of EMG median power frequency. Tn contrast, EMG median power frequency in isometric contractions of the same muscles decreased by 7% for the soleus muscle and 16 to 18% for gastrocnemius muscles immediately after the exercise, During the recovery period the isometric median power Frequency of the gastrocnemius muscles increased to pre-exercise levels in about 5 min. The isometric median power frequency of the soleus muscle also increased but had not reached pre-exercise values by 20 min. The observations from this study and from a previous uphill treadmill investigation at a steeper gradient ga-cre evidence that two types of exhaustion can be distinguished during dynamic exercise; exhaustion at lower exercise intensities without a decrease in frequency during exercise and exhaustion at high intensities accompanied by a decline of frequency. The reason for this difference remains unclear.
KW - Dynamic contractions
KW - Isometric contractions
KW - Median power frequency
KW - Muscle fatigue
UR - http://www.scopus.com/inward/record.url?scp=0029782603&partnerID=8YFLogxK
UR - https://research.rug.nl/en/publications/electromyogram-median-power-frequency-in-dynamic-exercise-at-medium-exercise-intensities(c780bf88-e7e7-430a-a320-1b01c2121de9).html
U2 - 10.1007/BF00376511
DO - 10.1007/BF00376511
M3 - Article
C2 - 8891517
SN - 0301-5548
VL - 74
SP - 180
EP - 186
JO - European Journal of Applied Physiology and Occupational Physiology
JF - European Journal of Applied Physiology and Occupational Physiology
IS - 1-2
ER -