The assessment of muscle mechanical properties in multi-joint movements reveals inverse correlation of leg muscle force and power with gait transition speed

2020 ◽  
Vol 77 ◽  
pp. 59-63
Author(s):  
Slobodanka Dobrijevic ◽  
Igor Ranisavljev ◽  
Sasa Djuric ◽  
Vladimir Ilic
Keyword(s):  
Mechanical Properties ◽  
Muscle Force ◽  
Inverse Correlation ◽  
Gait Transition ◽  
Transition Speed ◽  
Leg Muscle

Lower leg muscle force prediction in gait transition

2021 ◽  
Author(s):  
Camila Taira ◽  
Masayuki Kawada ◽  
Ryoji Kiyama ◽  
Arturo Forner-Cordero
Keyword(s):  
Muscle Force ◽  
Lower Leg ◽  
Gait Transition ◽  
Force Prediction ◽  
Leg Muscle

scholarly journals What Happened with Muscle Force, Dynamic Stability And Falls?- a 10-Year Longitudinal Follow-Up in Adults with Myotonic Dystrophy Type 1

2021 ◽  
pp. 1-10
Author(s):  
Elisabet Hammarén ◽  
Lena Kollén
Keyword(s):  
Myotonic Dystrophy ◽  
Dynamic Stability ◽  
Muscle Force ◽  
Step Test ◽  
Maximum Speed ◽  
Myotonic Dystrophy Type 1 ◽  
Myotonic Dystrophy Type ◽  
Patient Reported ◽  
Leg Muscle

Background: Individuals with myotonic dystrophy type 1 (DM1) are known to stumble and fall, but knowledge is scarce regarding dynamic stability in this disorder. Objective: To describe disease progress regarding muscle force, dynamic stability and patient reported unintentional falls during a ten-year period, in individuals with DM1. Methods: Quantification of isometric muscle force in four leg muscle groups and assessment of Timed 10-meter-walk in maximum speed (T10max), Timed Up&Go (TUG) and Step test (STEP) were performed at three occasions in a DM1 cohort, together with self-reported falls. Results: Thirty-four people (m/f:11/23, age:50.2 + /–9.4) participated. The muscle force loss after ten years was large in the distal ankle muscles. A steeper force decrease was seen in most muscles between year five and ten compared to the former five-year period. Males reported more falls than females, 91%vs 35%had fallen last year. A positive correlation, ρ= 0.633, p <  0.001, was shown between walking time (T10max) and number of falls. Frequent fallers were only seen among those with slower walk (T10max >  10seconds), and fewer steps in the STEP test (STEP≤5 steps). Conclusions: A diminishing leg muscle strength and worse dynamic stability were seen in the group, with a steeper decrease in the latter five years. Weak ankle dorsiflexors, a slower walk and difficulties to lift the forefoot were related to frequent falls.

Tensiomyography reliability and prediction of changes in muscle force following heavy eccentric strength exercise using muscle mechanical properties

2015 ◽  
Vol 8 (1-2) ◽  
pp. 58-66 ◽  
Author(s):  
Rauno Álvaro de Paula Simola ◽  
Nico Harms ◽  
Christian Raeder ◽  
Michael Kellmann ◽  
Tim Meyer ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Muscle Force ◽  
Strength Exercise

Pectoral fin locomotion in the striped surfperch. II. Scaling swimming kinematics and performance at a gait transition

1996 ◽  
Vol 199 (10) ◽  
pp. 2243-2252 ◽  
Author(s):  
E Drucker ◽  
J Jensen
Keyword(s):  
Body Size ◽  
Swimming Speed ◽  
Beat Frequency ◽  
Small Fish ◽  
Maximal Velocity ◽  
Pectoral Fin ◽  
Gait Transition ◽  
Transition Speed ◽  
Aspect Ratios ◽  
And Performance

In this study, we report the first allometric equations relating gait parameters and swimming speed to body size for fish employing pectoral fin locomotion. Comparisons of locomotor kinematics and performance among striped surfperch (Teleostei: Embiotocidae) are made at the pectoral&shy;caudal gait transition speed (Up-c). Up-c is considered to elicit physiologically equivalent levels of exercise in animals varying over 100-fold in body mass (Mb) by virtue of dynamically similar pectoral fin movements (constant duty factor, length-specific stride length and fin-beat amplitude) and size-independent propulsive efficiency. At Up-c, pectoral fin-beat frequency scales in proportion to Mb-0.12&plusmn;0.03, a size-dependence consistent with that observed for stride frequency in fishes swimming by axial undulatory propulsion and in many running tetrapods. It is proposed that the similarity in the scaling of frequency in these vertebrate groups reflects an underlying similarity in the allometry of the maximal velocity of muscle shortening. Absolute Up-c (m s-1) generally increases with body size, but the fastest speeds are not exhibited by the largest animals. A pattern of declining performance in fish 23 cm in standard length and longer may be related to their disproportionately small fin areas and aspect ratios. The pronounced negative allometry of Up-c expressed as standard body lengths per second indicates that a given length-specific speed does not induce comparable levels of activity in large and small fish. Thus, normalization of swimming speed to body length may not be a sufficient correction for kinematic comparisons across size.

Skeletal muscle force and actomyosin ATPase activity reduced by nitric oxide donor

1997 ◽  
Vol 83 (4) ◽  
pp. 1326-1332 ◽  
Author(s):  
William J. Perkins ◽  
Young-Soo Han ◽  
Gary C. Sieck
Keyword(s):  
Nitric Oxide ◽  
Mechanical Properties ◽  
Atpase Activity ◽  
Muscle Force ◽  
Isometric Force ◽  
Nitric Oxide Donor ◽  
No Donor ◽  
Single Fibers ◽  
Actomyosin Atpase ◽  
Cross Bridge

Perkins, William J., Young-Soo Han, and Gary C. Sieck.Skeletal muscle force and actomyosin ATPase activity reduced by nitric oxide donor. J. Appl. Physiol.83(4): 1326–1332, 1997.—Nitric oxide (NO) may exert direct effects on actin-myosin cross-bridge cycling by modulating critical thiols on the myosin head. In the present study, the effects of the NO donor sodium nitroprusside (SNP; 100 μM to 10 mM) on mechanical properties and actomyosin adenosinetriphosphatase (ATPase) activity of single permeabilized muscle fibers from the rabbit psoas muscle were determined. The effects of N-ethylmaleimide (NEM; 5–250 μM), a thiol-specific alkylating reagent, on mechanical properties of single fibers were also evaluated. Both NEM (≥25 μM) and SNP (≥1 mM) significantly inhibited isometric force and actomyosin ATPase activity. The unloaded shortening velocity of SNP-treated single fibers was decreased, but to a lesser extent, suggesting that SNP effects on isometric force and actomyosin ATPase were largely due to decreased cross-bridge recruitment. The calcium sensitivity of SNP-treated single fibers was also decreased. The effects of SNP, but not NEM, on force and actomyosin ATPase activity were reversed by treatment with 10 mMdl-dithiothreitol, a thiol-reducing agent. We conclude that the NO donor SNP inhibits contractile function caused by reversible oxidation of contractile protein thiols.

Assessment of lower leg muscle force distribution during isometric ankle dorsi and plantar flexion in patients with diabetes: a preliminary study

2015 ◽  
Vol 29 (2) ◽  
pp. 282-287 ◽  
Author(s):  
Michalina Błażkiewicz ◽  
Lakshmi Sundar ◽  
Aoife Healy ◽  
Ambady Ramachandran ◽  
Nachiappan Chockalingam ◽  
...  
Keyword(s):  
Muscle Force ◽  
Plantar Flexion ◽  
Lower Leg ◽  
Force Distribution ◽  
Patients With Diabetes ◽  
Preliminary Study ◽  
Leg Muscle

Stability Landscapes of Walking and Running Near Gait Transition Speed

2000 ◽  
Vol 16 (4) ◽  
pp. 428-435 ◽  
Author(s):  
Li Li
Keyword(s):  
Systems Approach ◽  
Quantitative Measure ◽  
Human Locomotion ◽  
Human Motion ◽  
Mathematical Representation ◽  
Gait Transition ◽  
Transition Speed ◽  
Acceleration And Deceleration ◽  
Transition Change ◽  
The Stability

Variability has long been used as an indication of stability in the application of a dynamical systems approach to human motion (i.e., greater variability has been related to a less stable system and vise versa). This paper incorporates the probability of gait transition during walking and running at a certain speed to represent the stability of human locomotion. The mathematical representation concerning the probability of gait transition change with locomotory speed was derived for increasing walking speed and decreasing running speed. Additionally, the influence of acceleration and deceleration on the stability landscapes of walking and running was discussed based on experimental data. The influence of acceleration was also used to explain the different trends of hysteresis observed by various researchers. Walk-to-run transition speed was greater than run-to-walk transition speed, with a greater magnitude of acceleration, while the trend was reversed with a lesser acceleration magnitude. The quantitative measure of the relationship between variability and stability needs to be explored in the future.

scholarly journals Is Test Standardization Important when Arm and Leg Muscle Mechanical Properties are Assessed Through the Force‐Velocity Relationship?

2019 ◽  
Vol 69 (1) ◽  
pp. 47-58
Author(s):  
Marko Cosic ◽  
Sasa Djuric ◽  
Milena Z. Zivkovic ◽  
Aleksandar Nedeljkovic ◽  
Bojan Leontijevic ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Concurrent Validity ◽  
Bench Press ◽  
Isometric Force ◽  
Movement Pattern ◽  
Strength Properties ◽  
Maximum Force ◽  
Force Velocity ◽  
Leg Muscle ◽  
Squat Jumps

Abstract The force‐velocity (F‐V) relationship observed in multi‐joint tasks proved to be strong and approximately linear. Recent studies showed that mechanical properties of muscles: force (F), velocity (V) and power (P) could be assessed through the F‐V relationship although the testing methods have not been standardized. The aim of the present study was to evaluate and compare F‐V relationships assessed from two tests performed on a modified Smith machine that standardizes kinematics of the movement pattern. Fifteen participants were tested on the maximum performance bench press throws and squat jumps performed against a variety of different loads. In addition, their strength properties were assessed through maximum isometric force (Fiso) and one repetition maximum (1 RM). The observed individual F‐V relationships were exceptionally strong and approximately linear (r = 0.98 for bench press throws; r = 0.99 for squat jumps). F‐V relationship parameter depicting maximum force (F0) revealed high correlations with both Fiso and 1 RM indicating high concurrent validity (p < 0.01). However, the generalizability of F‐V relationship parameters depicting maximum force (F0), velocity (V0) and power (P0) of the tested muscle groups was inconsistent and on average low (i.e. F0; r = ‐0.24) to moderate (i.e. V0 and P0; r = 0.54 and r = 0.64, respectively; both p < 0.05). We concluded that the F‐V relationship could be used for the assessment of arm and leg muscle mechanical properties when standard tests are applied, since the typical outcome is an exceptionally strong and linear F‐V relationship, as well as high concurrent validity of its parameters. However, muscle mechanical properties could be only partially generalized across different tests and muscles.

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