Viscosity of the elbow flexor muscles during maximal eccentric and concentric actions

1996 ◽  
Vol 73 (1-2) ◽  
pp. 157-162 ◽  
Author(s):  
A. Martin ◽  
B. Morlon ◽  
M. Pousson ◽  
J. Van Hoecke
Keyword(s):  
Elbow Flexor ◽  
Flexor Muscles ◽  
Elbow Flexor Muscles

scholarly journals Downhill running impairs peripheral but not central neuromuscular indices in elbow flexor muscles

2021 ◽  
Author(s):  
Xin Ye ◽  
Robert J. Benton ◽  
William M. Miller ◽  
Sunggun Jeon ◽  
Jun Seob Song
Keyword(s):  
Elbow Flexor ◽  
Downhill Running ◽  
Flexor Muscles ◽  
Elbow Flexor Muscles

Older Adults Use a Unique Strategy to Lift Inertial Loads With the Elbow Flexor Muscles

2000 ◽  
Vol 83 (4) ◽  
pp. 2030-2039 ◽  
Author(s):  
Andrew E. Graves ◽  
Kurt W. Kornatz ◽  
Roger M. Enoka
Keyword(s):  
Young Adults ◽  
Elbow Joint ◽  
Muscle Activation ◽  
Angular Displacement ◽  
Elbow Flexor ◽  
Lengthening Contractions ◽  
Old Adults ◽  
Flexor Muscles ◽  
Elbow Flexor Muscles ◽  
Target Force

The purpose of this study was to determine the effect of age on the ability to exert steady forces and to perform steady flexion movements with the muscles that cross the elbow joint. An isometric task required subjects to exert a steady force to match a target force that was displayed on a monitor. An anisometric task required subjects to raise and lower inertial loads so that the angular displacement around the elbow joint matched a template displayed on a monitor. Steadiness was measured as the coefficient of variation of force and as the normalized standard deviation of wrist acceleration. For the isometric task, steadiness as a function of target force decreased similarly for old adults and young adults. For the anisometric task, steadiness increased as a function of the inertial load and there were significant differences caused by age. Old adults were less steady than young adults during both shortening and lengthening contractions with the lightest loads. Furthermore, old adults were least steady when performing lengthening contractions. These behaviors appear to be associated with the patterns of muscle activation. These results suggest that different neural strategies are used to control isometric and anisometric contractions performed with the elbow flexor muscles and that these strategies do not change in parallel with advancing age.

scholarly journals Determining Consistency of Elbow Joint Threshold Angle in Elbow Flexor Muscles With Spastic Hypertonia

1996 ◽  
Vol 76 (6) ◽  
pp. 586-600 ◽  
Author(s):  
Steven L Wolf ◽  
Richard L Segal ◽  
Pamela A Catlin ◽  
Julie Tschorn ◽  
Tina Raleigh ◽  
...  
Keyword(s):  
Elbow Joint ◽  
Elbow Flexor ◽  
Flexor Muscles ◽  
Elbow Flexor Muscles

Task Differences With the Same Load Torque Alter the Endurance Time of Submaximal Fatiguing Contractions in Humans

2002 ◽  
Vol 88 (6) ◽  
pp. 3087-3096 ◽  
Author(s):  
Sandra K. Hunter ◽  
Daphne L. Ryan ◽  
Justus D. Ortega ◽  
Roger M. Enoka
Keyword(s):  
Mean Arterial Pressure ◽  
Arterial Pressure ◽  
Elbow Flexor ◽  
Emg Activity ◽  
Load Torque ◽  
Endurance Time ◽  
Position Task ◽  
Flexor Muscles ◽  
Elbow Flexor Muscles ◽  
Fatiguing Contractions

Endurance time, muscle activation, and mean arterial pressure were measured during two types of submaximal fatiguing contractions that required each subject to exert the same net muscle torque in the two tasks. Sixteen men and women performed isometric contractions at 15% of the maximum voluntary contraction (MVC) force with the elbow flexor muscles, either by maintaining a constant force while pushing against a force transducer (force task) or by supporting an equivalent inertial load while maintaining a constant elbow angle (position task). The endurance time for the force task (1402 ± 728 s) was twice as long as that for the position task (702 ± 582 s, P < 0.05), despite a similar reduction in the load torque at exhaustion for each contraction. The rate of increase in average electromyographic activity (EMG, % peak MVC value) for the elbow flexor muscles was similar for the two tasks. However, the average EMG was greater at exhaustion for the force task (22.4 ± 1.2%) compared with the position task (14.9 ± 1.0%, P < 0.05). In contrast, the rates of increase in the mean arterial pressure, the rating of perceived exertion, anterior deltoid EMG, and fluctuations in motor output (force or acceleration) were greater for the position task compared with the force task ( P < 0.05). Furthermore, the rate of bursts in EMG activity, which corresponded to the transient recruitment of motor units, was greater for the brachialis muscle during the position task. These results indicate that the briefer endurance time for the position task was associated with greater levels of excitatory and inhibitory input to the motor neurons compared with the force task.

Effects of Temperature on Elbow Flexor Muscles (Biceps) Endurance

2016 ◽  
Vol 9 (1) ◽  
pp. 19-22
Author(s):  
Sumit Kalra ◽  
◽  
Nidhi Kalra ◽  
Davinder K. Gaur ◽  
Savita Tamaria ◽  
...  
Keyword(s):  
Elbow Flexor ◽  
Flexor Muscles ◽  
Elbow Flexor Muscles ◽  
Effects Of Temperature

scholarly journals Prior heat stress effects fatigue recovery of the elbow flexor muscles

2011 ◽  
Vol 44 (1) ◽  
pp. 115-125 ◽  
Author(s):  
Masaki Iguchi ◽  
Richard K. Shields
Keyword(s):  
Heat Stress ◽  
Elbow Flexor ◽  
Stress Effects ◽  
Flexor Muscles ◽  
Elbow Flexor Muscles ◽  
Fatigue Recovery
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