Changes in neural drive to calf muscles during steady submaximal contractions after repeated static stretches

2021 ◽  
Author(s):  
Melissa R. Mazzo ◽  
Logan E. Weinman ◽  
Valerio Giustino ◽  
Bailey Mclagan ◽  
John Maldonado ◽  
...  
Keyword(s):  
Neural Drive ◽  
Calf Muscles

3D Microstructural Fiber Tracking of the Human Calf Muscles in Individuals With and Without Type 2 Diabetes during Rest and Exercise

Diabetes ◽  
2018 ◽  
Vol 67 (Supplement 1) ◽  
pp. 632-P
Author(s):  
MASOUD EDALATI ◽  
CHRISTOPHER J. SORENSEN ◽  
MARY HASTINGS ◽  
MOHAMED A. ZAYED ◽  
MICHAEL J. MUELLER ◽  
...  
Keyword(s):  
Type 2 Diabetes ◽  
Fiber Tracking ◽  
Human Calf ◽  
Calf Muscles ◽  
Rest And Exercise

scholarly journals Association between Oxygen Consumption and Surface Electromyographic Amplitude and Its Variation within Individual Calf Muscles during Walking at Various Speeds

Sensors ◽  
2021 ◽  
Vol 21 (5) ◽  
pp. 1748
Author(s):  
Kohei Watanabe ◽  
Shideh Narouei
Keyword(s):  
Oxygen Consumption ◽  
Spatial Variation ◽  
Metabolic Response ◽  
Correlation Coefficients ◽  
Surface Emg ◽  
Medial Gastrocnemius ◽  
Whole Body ◽  
Young Males ◽  
Emg Amplitude ◽  
Calf Muscles

Surface electromyography (EMG) has been used to estimate muscle work and physiological burden of the whole body during human movements. However, there are spatial variations in surface EMG responses within individual muscles. The aim of this study was to investigate the relation between oxygen consumption and surface EMG responses of lower leg muscles during walking at various speeds and to quantify its spatial variation within an individual muscle. Nine young males walked on a treadmill at four speeds: preferred minus 1 km/h, preferred, preferred plus 1 km/h, and preferred plus 2 km/h, and the metabolic response was measured based on the expired gas. High-density surface EMG of the tibialis anterior (TA), medial gastrocnemius (MG), lateral gastrocnemius, and soleus muscles was performed using 64 two-dimensional electrode grids. Correlation coefficients between oxygen consumption and the surface EMG amplitude were calculated across the gait speeds for each channel in the electrode grid and for individual muscles. Mean correlation coefficients across electrodes were 0.69–0.87 for the four individual muscles, and the spatial variation of correlation between the surface EMG amplitude and oxygen consumption within an electrode grid was significantly greater in MG muscle than in TA muscle (Quartile deviations: 0.24 for MG and 0.02 for TA, p < 0.05). These results suggest that the physiological burden of the whole body during gait at various speeds can be estimated from the surface EMG amplitude of calf muscles, but we need to note its spatial distribution within the MG muscle.

Comparison of single and multiple joint muscle functions and neural drive of trained athletes and untrained individuals

2021 ◽  
pp. 1-11
Author(s):  
Kale Mehmet
Keyword(s):  
Muscle Activation ◽  
Time Windows ◽  
Knee Extension ◽  
Electromechanical Delay ◽  
Neural Drive ◽  
Lower Limb Muscles ◽  
Explosive Force ◽  
Biarticular Muscle ◽  
Voluntary Contractions ◽  
Maximum Voluntary Force

BACKGROUND: There is insufficient knowledge about the rate of force development (RFD) characteristics over both single and multiple joint movements and the electromechanical delay (EMD) values obtained in athletes and untrained individuals. OBJECTIVE: To compare single and multiple joint functions and the neural drive of trained athletes and untrained individuals. METHODS: Eight trained athletes and 10 untrained individuals voluntarily participated to the study. The neuromuscular performance was assessed during explosive and maximum voluntary isometric contractions during leg press and knee extension related to single and multiple joint. Explosive force and surface electromyography of eight superficial lower limb muscles were measured in five 50-ms time windows from their onset, and normalized to peak force and electromyography activity at maximum voluntary force, respectively. The EMD was determined from explosive voluntary contractions (EVC’s). RESULTS: The results showed that there were significant differences in absolute forces during knee extension maximum voluntary force and EVC’s (p< 0.01) while trained athletes achieved greater relative forces than untrained individuals of EVC at all five time points (p< 0.05). CONCLUSIONS: The differences in explosive performance between trained athletes and untrained individuals in both movements may be explained by different levels of muscle activation within groups, attributed to variation in biarticular muscle function over both activities.

scholarly journals A physiological model for interpretation of arterial spin labeling reactive hyperemia of calf muscles

PLoS ONE ◽  
2017 ◽  
Vol 12 (8) ◽  
pp. e0183259 ◽  
Author(s):  
Hou-Jen Chen ◽  
Graham A. Wright
Keyword(s):  
Arterial Spin Labeling ◽  
Reactive Hyperemia ◽  
Physiological Model ◽  
Spin Labeling ◽  
Calf Muscles

Autogenetic reflex effects of slow or steady stretch of the calf muscles in man

1968 ◽  
Vol 6 (2) ◽  
Author(s):  
R.F. Mark ◽  
J.M. Coquery ◽  
J. Paillard
Keyword(s):  
Calf Muscles

Limits to the Control of the Human Thumb and Fingers in Flexion and Extension

2010 ◽  
Vol 103 (1) ◽  
pp. 278-289 ◽  
Author(s):  
W. S. Yu ◽  
H. van Duinen ◽  
S. C. Gandevia
Keyword(s):  
Control System ◽  
Healthy Subjects ◽  
Neural Control ◽  
Force Production ◽  
Total Force ◽  
Neural Drive ◽  
Antagonist Muscles ◽  
Hand Performance ◽  
The Difference ◽  
Flexion And Extension

In humans, hand performance has evolved from a crude multidigit grasp to skilled individuated finger movements. However, control of the fingers is not completely independent. Although musculotendinous factors can limit independent movements, constraints in supraspinal control are more important. Most previous studies examined either flexion or extension of the digits. We studied differences in voluntary force production by the five digits, in both flexion and extension tasks. Eleven healthy subjects were instructed either to maximally flex or extend their digits, in all single- and multidigit combinations. They received visual feedback of total force produced by “instructed” digits and had to ignore “noninstructed” digits. Despite attempts to maximally flex or extend instructed digits, subjects rarely generated their “maximal” force, resulting in a “force deficit,” and produced forces with noninstructed digits (“enslavement”). Subjects performed differently in flexion and extension tasks. Enslavement was greater in extension than in flexion tasks ( P = 0.019), whereas the force deficit in multidigit tasks was smaller in extension ( P = 0.035). The difference between flexion and extension in the relationships between the enslavement and force deficit suggests a difference in balance of spillover of neural drive to agonists acting on neighboring digits and focal neural drive to antagonist muscles. An increase in drive to antagonists would lead to more individualized movements. The pattern of force production matches the daily use of the digits. These results reveal a neural control system that preferentially lifts fingers together by extension but allows an individual digit to flex so that the finger pads can explore and grasp.

scholarly journals A pilot study of regional perfusion and oxygenation in calf muscles of individuals with diabetes with a noninvasive measure

2014 ◽  
Vol 59 (2) ◽  
pp. 419-426 ◽  
Author(s):  
Jie Zheng ◽  
Mary K. Hasting ◽  
Xiaodong Zhang ◽  
Andrew Coggan ◽  
Hongyu An ◽  
...  
Keyword(s):  
Pilot Study ◽  
Regional Perfusion ◽  
Calf Muscles

Decoding the neural drive to muscles from the surface electromyogram

2010 ◽  
Vol 121 (10) ◽  
pp. 1616-1623 ◽  
Author(s):  
Dario Farina ◽  
Aleš Holobar ◽  
Roberto Merletti ◽  
Roger M. Enoka
Keyword(s):  
Neural Drive ◽  
Surface Electromyogram

Muscle Fatigue and the Influence of Changing Neural Drive

1984 ◽  
Vol 5 (1) ◽  
pp. 21-34
Author(s):  
B. Bigland-Ritchie
Keyword(s):  
Muscle Fatigue ◽  
Neural Drive

Diaphragm afferent modulation of phrenic motor drive

1987 ◽  
Vol 62 (6) ◽  
pp. 2436-2441 ◽  
Author(s):  
D. L. Fryman ◽  
D. T. Frazier
Keyword(s):  
Negative Pressure ◽  
Phrenic Nerve ◽  
Lower Body Negative Pressure ◽  
Motor Drive ◽  
Lower Body ◽  
Inspiratory Time ◽  
Neural Drive ◽  
Dorsal Rhizotomy ◽  
Bilateral Vagotomy ◽  
Thiopental Sodium

Experiments were performed in eight lightly anesthetized thiopental sodium (Pentothal) cats to examine whether diaphragmatic afferents can significantly alter the neural drive to the diaphragm when the animal is exposed to lower body negative pressure. Moving-time-averaged diaphragmatic electromyograms (EMGma) were recorded and compared before and during exposure to lower body negative pressure in each of three consecutive conditions: C7 spinalization, bilateral vagotomy, and cervical dorsal rhizotomy. Application of lower body negative pressure in C7-spinalized animals resulted in a decrease in inspiratory time and peak diaphragmatic activity compared with control levels. After bilateral vagotomy, EMGma activity was prolonged with the application of lower body negative pressure. However, there was no increase in peak EMGma activity. After transection of the cervical dorsal roots subserving the phrenic nerve, the prolongation of diaphragmatic activity negative was eliminated. Therefore, we conclude that the significant increase in duration of inspiration in response to application of lower body negative pressure in the C7-spinalized, bilaterally vagotomized cat is mediated by phrenic nerve afferents.

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