Influence of joint position on synergistic muscle activity after fatigue of a single muscle head

2015 ◽  
Vol 51 (2) ◽  
pp. 259-267 ◽  
Author(s):  
Norman Stutzig ◽  
Tobias Siebert
Keyword(s):  
Muscle Activity ◽  
Single Muscle ◽  
Joint Position ◽  
Synergistic Muscle

Study of the interaction between knee joint position, joint loads, and muscle activity at the knee

1983 ◽  
Vol 16 (4) ◽  
pp. 295-296
Author(s):  
T.P. Andriacchi ◽  
G.B.J. Andersson ◽  
R. Ortengren ◽  
R. Mikosz
Keyword(s):  
Knee Joint ◽  
Muscle Activity ◽  
Joint Position ◽  
Joint Loads

scholarly journals Neuromuscular adjustments of gait associated with unstable conditions

2015 ◽  
Vol 114 (5) ◽  
pp. 2867-2882 ◽  
Author(s):  
G. Martino ◽  
Y. P. Ivanenko ◽  
A. d'Avella ◽  
M. Serrao ◽  
A. Ranavolo ◽  
...  
Keyword(s):  
Muscle Activity ◽  
Gait Cycle ◽  
Activity Patterns ◽  
Human Locomotion ◽  
Support Surface ◽  
Muscle Activations ◽  
The Right ◽  
Weighting Coefficients ◽  
Synergistic Muscle ◽  
Non Negative Matrix Factorization

A compact description of coordinated muscle activity is provided by the factorization of electromyographic (EMG) signals. With the use of this approach, it has consistently been shown that multimuscle activity during human locomotion can be accounted for by four to five modules, each one comprised of a basic pattern timed at a different phase of gait cycle and the weighting coefficients of synergistic muscle activations. These modules are flexible, in so far as the timing of patterns and the amplitude of weightings can change as a function of gait speed and mode. Here we consider the adjustments of the locomotor modules related to unstable walking conditions. We compared three different conditions, i.e., locomotion of healthy subjects on slippery ground (SL) and on narrow beam (NB) and of cerebellar ataxic (CA) patients on normal ground. Motor modules were computed from the EMG signals of 12 muscles of the right lower limb using non-negative matrix factorization. The unstable gait of SL, NB, and CA showed significant changes compared with controls in the stride length, stride width, range of angular motion, and trunk oscillations. In most subjects of all three unstable conditions, >70% of the overall variation of EMG waveforms was accounted for by four modules that were characterized by a widening of muscle activity patterns. This suggests that the nervous system adopts the strategy of prolonging the duration of basic muscle activity patterns to cope with unstable conditions resulting from either slippery ground, reduced support surface, or pathology.

scholarly journals The effects of food restriction and exercise on site-specific differences in adipocyte volume and adipose tissue cellularity in the guinea-pig

1984 ◽  
Vol 51 (3) ◽  
pp. 425-433 ◽  
Author(s):  
Caroline M. Pond ◽  
Christine A. Mattacks ◽  
Dawn Sadler
Keyword(s):  
Adipose Tissue ◽  
Guinea Pig ◽  
Fat Mass ◽  
Muscle Activity ◽  
Food Restriction ◽  
Local Effect ◽  
Site Specific ◽  
Diet And Exercise ◽  
Adipocyte Volume ◽  
Synergistic Muscle

1. Two intermuscular adipose depots, the popliteal mass (POP) and the fat under the gluteus superficialis muscle (GLS) were studied in guinea-pigs maintained under three different regimes of diet and exercise.2. Eleven different sites in POP and four sites in GLS were defined using associated muscle and fascia as ‘landmarks’. Samples of twenty to twenty-five adipocytes from each site were removed and their mean volume measured; a consistent pattern of distribution of larger and smaller adipocytes within POP and GLS was found in all animals.3. The correlation between the volume of adipocytes from sites between the same pairs of muscles was substantially greater than the correlation between the volume of adipocytes from comparable sites between different muscles, whether the sites were within the same fat mass (POP) or in different fat masses (POP and GLS).4. The volume of adipocytes from the edge of the fat mass correlated more closely with those from the edge of the same or a synergistic muscle than with the volume of cells from the centre sites or edge sites from an interface with another muscle. These effects were most pronounced in exercised animals and weak or insignificant in sedentary ad lib.-fed animals.5. The volume of adipocytes from edge sites correlated with the gross weight of the adjacent muscles in exercised animals only.6. It is concluded that muscle activity has a local effect on the volume of adjacent adipocytes. It is suggested that the mechanism involved is mechanical rather than biochemical.

Muscle activities of lower extremity and erector spinae muscles according to ankle joint position during squat exercise

2021 ◽  
pp. 1-6
Author(s):  
Ha-Rim Sung ◽  
Se-Jung Oh ◽  
Jun-Nam Ryu ◽  
Yong-Jun Cha
Keyword(s):  
Lower Extremity ◽  
Ankle Joint ◽  
Muscle Activity ◽  
Vastus Lateralis ◽  
Plantar Flexion ◽  
Erector Spinae ◽  
Neutral Position ◽  
Vastus Medialis ◽  
Joint Position ◽  
Squat Exercise

OBJECTIVE: The purpose of this study was to investigate the most effective ankle joint position for squat exercise by comparing muscle activities of lower extremity and erector spinae muscles in different ankle joint positions. METHODS: Thirty-seven normal healthy adults in their 20s participated in this study. Muscle activities of dominant vastus medialis oblique, vastus lateralis, biceps femoris, and erect spinae were measured in three ankle joint positions; dorsiflexion, neutral, and plantar flexion. RESULTS: Muscle activities of the vastus medialis oblique, vastus lateralis, and erector spinae muscles were statistically different in the three ankle joint positions during squat exercise (p< 0.05). Vastus medialis oblique muscles showed higher muscle activity in ankle plantar flexion than in the dorsiflexion or neutral positions (plantar flexion > neutral position, +3.3% of maximal voluntary isometric contraction (MVIC); plantar flexion > dorsiflexion, +12.2% of MVIC, respectively). Vastus lateralis muscles showed 7.1% of MVIC greater muscle activity in the neutral position than in dorsiflexion, and erector spinae muscles showed higher muscle activity in dorsiflexion than in plantar flexion or in the neutral position (dorsiflexion > neutral position, +4.3% of MVIC; dorsiflexion > plantar flexion, +7.1% of MVIC, respectively). CONCLUSION: In squat exercises designed to strengthen the vastus medialis oblique, ankle joint plantar flexion is probably the most effective ankle training position, and the dorsiflexion position might be the most effective exercise for strengthening the erector spinae muscle.

scholarly journals Influence of Hip Joint Position on Muscle Activity during Prone Hip Extension with Knee Flexion

2014 ◽  
Vol 26 (12) ◽  
pp. 1895-1898 ◽  
Author(s):  
Tadanobu Suehiro ◽  
Masatoshi Mizutani ◽  
Mitsuhisa Okamoto ◽  
Hiroshi Ishida ◽  
Kenichi Kobara ◽  
...  
Keyword(s):  
Hip Joint ◽  
Muscle Activity ◽  
Knee Flexion ◽  
Joint Position ◽  
Hip Extension

scholarly journals Effect of Hip Joint Position on Hip Abductor Muscle Activity during Lateral Step-up Exercises

2012 ◽  
Vol 24 (11) ◽  
pp. 1145-1148 ◽  
Author(s):  
Kyung-Hee Noh ◽  
Min-Hyeok Kang ◽  
Sun-Joung An ◽  
Mi-Hyun Kim ◽  
Won-Gyu Yoo ◽  
...  
Keyword(s):  
Hip Joint ◽  
Muscle Activity ◽  
Joint Position ◽  
Abductor Muscle ◽  
Hip Abductor

Effect of the position of the interphalangeal joint on movements of the trapeziometacarpal joint during thumb opposition

2022 ◽  
pp. 175319342110658
Author(s):  
Hiroshi Kurumadani ◽  
Kazuya Kurauchi ◽  
Shota Date ◽  
Yosuke Ishii ◽  
Toru Sunagawa
Keyword(s):  
Motion Capture ◽  
Muscle Activity ◽  
Interphalangeal Joint ◽  
Joint Position ◽  
Joint Movement ◽  
Trapeziometacarpal Joint ◽  
Thenar Muscle ◽  
Simple Method ◽  
Joint Flexion ◽  
Healthy Participants

The Kapandji test is a simple method to score thumb opposition; however, the position of the interphalangeal joint of the thumb during this test has not been described. We aimed to quantitatively examine the effect of the thumb interphalangeal joint position on movements of the trapeziometacarpal joint during thumb opposition using the Kapandji test. The Kapandji test was carried out in 20 healthy participants during thumb interphalangeal joint extension and flexion. Movements of the joints and the activity of thenar muscles were recorded using motion capture and electromyography, respectively. We found that interphalangeal joint extension increased the trapeziometacarpal joint movement and thenar muscle activity compared with interphalangeal joint flexion, which contributed to thumb opposition at Kapandji Positions 0–6. These findings suggest the position of the thumb interphalangeal joint affects the trapeziometacarpal joint during thumb opposition, and assessment of thumb opposition using the Kapandji test is best done with the thumb interphalangeal joint in extension.

Hip joint position modulates volitional knee extensor muscle activity after stroke

2006 ◽  
Vol 34 (6) ◽  
pp. 767-774 ◽  
Author(s):  
Michael D. Lewek ◽  
Brian D. Schmit ◽  
T. George Hornby ◽  
Yasin Y. Dhaher
Keyword(s):  
Hip Joint ◽  
Muscle Activity ◽  
Knee Extensor ◽  
Extensor Muscle ◽  
Joint Position
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