Effect of Pulsed Shortwave Diathermy on Average Isometric Peak Torque of Quadriceps Muscle in Normal Subjects

2017 ◽  
Vol 6 (2) ◽  
pp. 53
Author(s):  
Dina Shokri ◽  
Magdy Elnaggar ◽  
Hytham Elhafez ◽  
Magda Sedhom ◽  
Hala Elhabashy
Keyword(s):  
Peak Torque ◽  
Normal Subjects ◽  
Quadriceps Muscle ◽  
Shortwave Diathermy

scholarly journals Kinesio Taping Does Not Alter Quadriceps Isokinetic Strength and Power in Healthy Nonathletic Men: A Prospective Crossover Study

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Paweł Korman ◽  
Anna Straburzyńska-Lupa ◽  
Radosław Rutkowski ◽  
Jakub Gruszczyński ◽  
Jacek Lewandowski ◽  
...  
Keyword(s):  
Repeated Measures ◽  
Peak Torque ◽  
Quadriceps Muscle ◽  
Knee Extensors ◽  
Isokinetic Strength ◽  
Acute Effects ◽  
Isokinetic Dynamometer ◽  
Mean Power ◽  
Concentric Contractions ◽  
Kinesio Taping

Objectives. The effects of Kinesio Taping (KT) on muscular performance remain largely unclear. This study aimed to investigate the acute effects of KT on the maximum concentric and eccentric quadriceps isokinetic strength.Study Design. This is a single-blinded, placebo crossover, repeated measures study.Methods. Maximum isokinetic concentric/eccentric extension torque, work, and power were assessed by an isokinetic dynamometer without taping (NT) and with KT or placebo taping (PT) in 17 healthy young men. Repeated measures one-way analysis of variance (ANOVA) was used for statistical analyses.Results. Testing concentric contractions at 60°/s or 180°/s isokinetic speed, no significant differences in peak torque (Nm), total work (J), or mean power (W) were noted among the application modes under different conditions. Testing eccentric contractions at 30°/s or 60°/s isokinetic speed, no significant differences in mentioned parameters were noted, respectively. KT on the quadriceps neither decreased nor increased muscle strength in the participants.Conclusion. KT application onto the skin overlying the quadriceps muscle does not enhance the strength or power of knee extensors in healthy men.

scholarly journals A Novel Noninvasive Method for Measuring Fatigability of the Quadriceps Muscle in Noncooperating Healthy Subjects

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Jesper B. Poulsen ◽  
Martin H. Rose ◽  
Kirsten Møller ◽  
Anders Perner ◽  
Bente R. Jensen
Keyword(s):  
Healthy Subjects ◽  
Functional Limitations ◽  
Regression Line ◽  
Intraclass Correlation ◽  
Peak Torque ◽  
Quadriceps Muscle ◽  
Fatigue Index ◽  
Minimum Detectable Change ◽  
Torque Values ◽  
Index Ratio

Background. Critical illness is associated with muscle weakness leading to long-term functional limitations.Objectives. To assess the reliability of a novel method for evaluating fatigability of the quadriceps muscle in noncooperating healthy subjects.Methods. On two occasions, separated by seven days, nonvoluntary isometric contractions (twitch and tetanic) of the quadriceps femoris muscle evoked by transcutaneous electrical muscle stimulation were recorded in twelve healthy adults. For tetanic contractions, the Fatigue Index (ratio of peak torque values) and the slope of the regression line of peak torque values were primary outcome measures. For twitch contractions, maximum peak torque and rise time were calculated. Relative (intraclass correlation, ICC3.1) and absolute (standard error of measurement, SEM) reliability were assessed and minimum detectable change was calculated using a 95% confidence interval (MDC95%).Results. The Fatigue Index (ICC3.1, 0.84; MDC95%, 0.12) and the slope of the regression line (ICC3.1, 0.99; MDC95%, 0.03) showed substantial relative and absolute reliability during the first 15 and 30 contractions, respectively.Conclusion. This method for assessing fatigability of the quadriceps muscle produces reliable results in healthy subjects and may provide valuable data on quantitative changes in muscle working capacity and treatment effects in patients who are incapable of producing voluntary muscle contractions.

Can Hip Joint Position affect Quadriceps Muscle Responses during Knee Extension Exercise?

2020 ◽  
Vol 41 (13) ◽  
pp. 929-935
Author(s):  
Denis César Leite Vieira ◽  
Marco Aurélio Araujo Dourado ◽  
Lucas Ugliara ◽  
Joao Luiz Quagliotti Durigan ◽  
Brad J. Schoenfeld ◽  
...  
Keyword(s):  
Vastus Lateralis ◽  
Muscle Thickness ◽  
Rectus Femoris ◽  
Peak Torque ◽  
Quadriceps Muscle ◽  
Knee Extension ◽  
Knee Extensors ◽  
Work Output ◽  
Before And After ◽  
Knee Extension Exercise

AbstractThis study investigated the acute effects of seated and supine knee extension exercise on muscle swelling, torque, and work output. Twelve resistance-trained men performed two isokinetic concentric-only knee-extension training protocols at different hip positions in a counter-balanced order. They completed the knee extension exercise in the seated (hip angle at 85°) and supine (hip angle at 180°) positions. The torque and work output were assessed during each set. Moreover, muscle thickness of the middle and proximal vastus lateralis and rectus femoris were evaluated before and after each protocol and used as an indicator of muscle swelling. Middle rectus femoris and proximal vastus lateralis thickness increased significantly (p=0.01) with no difference between exercise variations. However, the middle vastus lateralis thickness increased (p=0.01) only after the seated knee extension exercise (~7%). Knee extensors’ peak torque and work output were approximately 8% higher (p=0.04) in the seated when compared to the supine hip position. There was a similar decrease in torque and work output throughout both protocols (p=0.98). In conclusion, seated knee extension exercises produced greater torque, work output, and muscle swelling in the vastus lateralis when compared to the supine knee extension exercise.

Rate of protein synthesis in skeletal muscle of normal man and patients with muscular dystrophy: A reassessment

1988 ◽  
Vol 74 (3) ◽  
pp. 237-240 ◽  
Author(s):  
D. Halliday ◽  
P. J. Pacy ◽  
K. N. Cheng ◽  
F. Dworzak ◽  
J. N. A. Gibson ◽  
...  
Keyword(s):  
Muscular Dystrophy ◽  
Muscle Protein ◽  
Normal Subjects ◽  
Quadriceps Muscle ◽  
Fed State ◽  
Synthetic Rate ◽  
New Finding ◽  
Normal Man ◽  
Relative Differences ◽  
Muscle Biopsies

1. Quadriceps muscle protein synthetic rate has been determined in healthy subjects in the post-absorptive (n = 18) and fed (n = 10) states and in patients with a variety of myopathies, by analysis of the enrichment of serial muscle biopsies taken during primed continuous infusion of l[1-13C]leucine. 2. Quadriceps protein synthetic rates in normal subjects were (mean ± sd) 0.046 ± 0.012 and 0.075 ± 0.014%/h in the post-absorptive and fed states respectively. These results are significantly lower than we previously reported (M. J. Rennie et al., Clinical Science, 1982, 63, 519–523 [1]) but show the same relative differences of direction and magnitude, confirming the effects of feeding previously reported. In patients with muscular dystrophy, muscle protein synthetic rate was, as previously reported [1], much lower in the fed state than in normal subjects. A new finding is that for patients with myotonic dystrophy the rate is also depressed in the postabortive state. 3. We suggest that the present estimates in post-absorptive and fed normal subjects be used as reference values for quadriceps mixed muscle protein synthetic rate.

scholarly journals The Determination of the Relationship Between Isokinetic Leg Strengths and Agility and Speed Performance of Elite Handball Players

2018 ◽  
Vol 6 (6) ◽  
pp. 25
Author(s):  
Zait Burak Aktuğ ◽  
Aykut Dündar ◽  
Fatih Murathan ◽  
Rüçhan İri
Keyword(s):  
Muscle Strength ◽  
Significant Relationship ◽  
High Weight ◽  
Peak Torque ◽  
Quadriceps Muscle ◽  
Isokinetic Dynamometer ◽  
Speed Performance ◽  
The Relationship ◽  
High Bmi

The aim of the study is to examine the relationship between isokinetic hamstring and quadriceps muscle strengths and agility and speed performance of elite male handball players. 15 male handball players participated in the study. The isokinetic leg forces of the handball players participating in the study were determined by isokinetic dynamometer, the agility performances by Ilionis and 505 agility test, and the speed performances by photocell. As a result of the analysis, there was no statistically significant relationship between isokinetic dominant and non-dominant leg hamstring and quadriceps peak torque forces and agility and speed performance at 60°s-1 and 400°s-1 angular speeds (p <0.05). As a result, it can be stated that there is no relation between hamstring and quadriceps muscle strength and speed and agility performances of handball players. This may be related to the requirements and physical characteristics of the handball branch (tall height, high weight, high BMI).

scholarly journals A prospective study of the muscle strength and reaction time of the quadriceps, hamstring, and gastrocnemius muscles in patients with plantar fasciitis

2020 ◽  
Vol 21 (1) ◽  
Author(s):  
Jin Hyuck Lee ◽  
Hae Woon Jung ◽  
Woo Young Jang
Keyword(s):  
Reaction Time ◽  
Muscle Strength ◽  
Plantar Fasciitis ◽  
Peak Torque ◽  
Quadriceps Muscle ◽  
Control Group ◽  
Foot Pressure ◽  
Delayed Reaction ◽  
Hamstring Muscles ◽  
Normal Controls

Abstract Background Muscle weakness is an important etiological factor in plantar fasciitis (PF), but available data on the role of the quadriceps, hamstring, and gastrocnemius (GCM) muscles are limited. The aim of this study was to compare the strength and reaction time of the quadriceps, hamstring, and GCM muscles and foot pressure between patients with PF and normal controls. Methods A total of 21 PF patients and 21 normal controls were enrolled. Muscle strength was measured by the peak torque per body weight (Nmkg− 1 × 100). Muscle reaction time was evaluated by the acceleration time (AT, milliseconds). Foot pressure and posture were assessed by pedobarography [valgus/varus index (VV index), %]. Results The strength of the quadriceps was significantly lower in the affected ankles of the PF group than in the control group (p = 0.005). The AT of the quadriceps and hamstring muscles was significantly increased in the affected ankles of the PF group than in the control group (quadriceps: p = 0.012, hamstring: p = 0.001), while the AT of the GCM muscle was significantly decreased (p = 0.009) and significantly correlated negatively with quadriceps muscle strength (r = −.598, p = 0.004) and AT (r = −.472, p = 0.031). Forefoot (p = 0.001) and hindfoot (p = 0.000) pressure were significantly greater, with the VV index showing hindfoot valgus, in the affected ankles in the PF group compared to the control group (p = 0.039). Conclusions This study demonstrated weakness and delayed reaction time of the quadriceps and hamstring muscles, with a rapid reaction time of the GCM muscle, in patients with PF. Clinical relevance Clinicians and therapists should assess the function of the quadriceps and hamstring muscles when planning the management of PF patients without muscle tightness.

Vascular responses in forearm and calf to contralateral static exercises

1989 ◽  
Vol 66 (2) ◽  
pp. 669-674 ◽  
Author(s):  
D. A. Duprez ◽  
L. K. Essandoh ◽  
P. M. Vanhoutte ◽  
J. T. Shepherd
Keyword(s):  
Vascular Resistance ◽  
Isometric Exercise ◽  
Normal Subjects ◽  
Quadriceps Muscle ◽  
Progressive Increase ◽  
Voluntary Contraction ◽  
Flexor Muscle ◽  
Arterial Blood ◽  
The Right ◽  
Forearm Vascular Resistance

Ten normal subjects performed a 90-s isometric exercise [20, 30, and 40% of maximal voluntary contraction (MVC) of the flexor muscle of the right index finger or quadriceps muscle of the right leg. Contralateral forearm and calf blood flows (strain gauge plethysmography) and arterial blood pressure (auscultation) were measured simultaneously. Each exercise caused a decrease in forearm vascular resistance and a progressive increase in calf resistance. These changes were greatest with the 40% MVC. With finger exercise at 20 and 40% MVC, the percentage decreases in forearm vascular resistance from control were 12.3 and 22.7%, respectively (P less than 0.01). Similar decreases (9.5 and 24.9%, respectively; P less than 0.01) were noted with exercise of the quadriceps muscle. By contrast, the corresponding increases in calf vascular resistance were greater (P less than 0.01) with quadriceps exercise (13.3 and 55.4%, respectively) than with finger exercise (6.0 and 36.0%). Arrest of the circulation to the exercising muscles just before the exercise ended caused an abrupt increase in forearm vascular resistance and a decrease in calf resistance. These studies provide further evidence of the heterogeneity of responses of forearm and calf resistance vessels to certain cardiovascular stimuli.

scholarly journals Muscle Atrophy and Functional Deficits of Knee Extensors and Flexors in People With Chronic Stroke

2012 ◽  
Vol 92 (3) ◽  
pp. 429-439 ◽  
Author(s):  
Christiane L. Prado-Medeiros ◽  
Milla P. Silva ◽  
Giovanna C. Lessi ◽  
Marcela Z. Alves ◽  
Alberto Tannus ◽  
...  
Keyword(s):  
Motor Function ◽  
Muscle Atrophy ◽  
Peak Torque ◽  
Quadriceps Muscle ◽  
Chronic Stroke ◽  
Muscle Volume ◽  
Knee Extensors ◽  
Control Group ◽  
Hamstring Muscle ◽  
Paretic Limb

BackgroundFurther clarification is needed with regard to the degree of atrophy in individual muscle groups and its possible relationship to joint torque deficit poststroke.ObjectiveThe purpose of this study was to investigate quadriceps and hamstring muscle volume and strength deficits of the knee extensors and flexors in people with chronic hemiparesis compared with a control group.DesignThis was a cross-sectional study.MethodsThirteen individuals with hemiparesis due to chronic stroke (hemiparetic group) and 13 individuals who were healthy (control group) participated in this study. Motor function, quadriceps and hamstring muscle volume, and maximal concentric and eccentric contractions of the knee extensors and flexors were assessed.ResultsOnly the quadriceps muscle of the paretic limb showed reduced muscle volume (24%) compared with the contralateral (nonparetic) limb. There were no differences in muscle volume between the hemiparetic and control groups. The peak torque of the paretic-limb knee extensors and flexors was reduced in both contraction modes and velocities compared with the nonparetic limb (36%–67%) and with the control group (49%–75%). The nonparetic limb also showed decreased extensor and flexor peak torque compared with the control group (17%–23%). Power showed similar deficits in strength (12%–78%). There were significant correlations between motor function and strength deficits (.54–.67).LimitationsMagnetic resonance imaging coil length did not allow measurement of the proximal region of the thigh.ConclusionsThere were different responses between quadriceps and hamstring muscle volumes in the paretic limb that had quadriceps muscle atrophy only. However, both paretic and nonparetic limbs showed knee extensor and flexor torque and power reduction.

Changes in EMG power spectrum (high-to-low ratio) with force fatigue in humans

1982 ◽  
Vol 53 (5) ◽  
pp. 1094-1099 ◽  
Author(s):  
J. Moxham ◽  
R. H. Edwards ◽  
M. Aubier ◽  
A. De Troyer ◽  
G. Farkas ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Electrical Stimulation ◽  
Power Spectrum ◽  
Low Frequency ◽  
Normal Subjects ◽  
Quadriceps Muscle ◽  
Force Response ◽  
Low Frequencies ◽  
Emg Power Spectrum ◽  
Low Frequency Fatigue

During and following high-load fatiguing voluntary contractions, the force response of skeletal muscle to electrical stimulation is altered so that the frequency-force curve is moved to the right. Fatiguing contractions also result in a shift to the left of the electromyographic (EMG) power spectrum. In the quadriceps muscle and the diaphragm of normal subjects the change in the force response to electrical stimulation has been correlated with the EMG changes. After repeated submaximal contractions in the quadriceps and diaphragm, the forces produced by electrical stimulation at low frequencies were reduced, indicating low-frequency fatigue. This type of fatigue persisted for several hours but did not result in any change in the EMG high-to-low ratio. Low-frequency fatigue is probably an important aspect of the failure of skeletal muscle to generate adequate force, and the EMG high-to-low ratio may not recognize this type of fatigue.

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