Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 36 for “"Isometric contractions"”.
-
Cardiovascular responses to two minutes of isometric contractions of the finger flexors in healthy women
… submaximal (20% MVC) and maximal (100% MVC) isometric contraction of the finger flexors in healthy women between the ages of 20 and 35 years. The cardiovascular variables which were investigated included; heart rate (HR), systolic blood pressure (SBP), diastolic blood pressure (DBP), mean …
-
Impedance Changes in Biceps Brachii Due to Isometric Contractions and Muscle Fatigue Using Electrical Impedance Myography (EIM)
… relationship between muscles at rest and during isometric contractions at various force levels(25%, 50%, and 100% of maximum voluntary contraction) of the biceps brachii over a multifrequency spectrum. Impedance measurements due to muscle fatigue was further studied and compared to muscles under …
-
Cardiovascular adjustments to isometric contractions: The role of intensity of contraction, endurance time, and different muscle groups
… (1) Are the cardiovascular responses to isometric contractions dependent on the relative intensity of contraction?; (2) Are the cardiovascular responses to isometric contractions to fatigue with the knee extensors and finger flexors different?; (3) Are the cardiovascular responses to …
-
Age Related Differences in Motor Output Variability During Isometric, Concentric and Eccentric Quadriceps Femoris Muscle Contractions
… elderly individuals to produce maximum voluntary contractions (MVC) and control submaximum levels of force during continuous isometric, discrete isometric, discrete concentric and discrete eccentric contractions of the quadriceps femoris. Of particular interest was to model variability of force …
-
Hemodynamic Responses to Isometric Contractions of the Finger Flexor and Leg Extensor Muscle Groups in Men 18-30 and 50-70 Years of Age
… years of age were assessed while performing isometric hand-grip and isometric leg extension tests. The object was to ascertain which cardiovascular variables(s), heart rate, stroke volume, cardiac output, total peripheral resistance, systolic blood pressure, diastolic blood pressure, pulse …
-
Comparing fatigue induced by isometric and shortening contractions in skeletal muscle
… in force during shortening compared with isometric contractions is not completely understood. The focus of this thesis was to compare fatigue in repeated shortening contractions and isometric contractions and investigate if greater force loss during repeated shortening contractions is …
-
Comparison of acute physiological effects between alternating current and pulsed current electrical muscle stimulation
… further muscle damage induced by EMS-evoked isometric contractions. Three experimental studies were conducted in the thesis project together with literature review about EMS.
-
Effects of muscle contractions on biceps brachii oxygenation investigated by near-infrared spectroscopy
… (eccentric), shortening (concentric) and static (isometric) voluntary contractions, and electrically evoked isometric contractions. Therefore, the overall purpose of this thesis was to investigate the effects of muscle contractions on biceps brachii oxygenation and haemodynamics using NIRS...
-
Impact of static stretch and muscular contractions on force production within the human triceps surae muscle-tendon complex
… commonly include stretching and intense muscular contractions in an attempt to optimise muscular performance and reduce injury risk. However, the isolated and combined effects of stretching and muscle contractions on neuromuscular performance are not well described. The aims of this research were …
-
Toward the Optimal Waveform for Electrical Stimulation
… four minute bouts of electrically stimulated isometric contractions equal to 10% of the maximal voluntary contraction (MVC) of their right quadriceps muscle to study subjective comfort and physiological responses to different waveforms, including Russian, interferential, sine, and square. …
-
Muscle performance during slow isokinetic speeds
… during the 5°/sec velocity compared to the isometric velocity. Subjects (n = 9) completed MVC knee extension exercises during eccentric speeds of 5, 10, and 15°/sec, as well as isometric contractions. Extensor force and average EMG (aEMG) of the vastus lateralis (VL) and biceps femoris …
-
The role of muscle strength and voluntary activation on symptomatic fatigue in multiple sclerosis
… dorsiflexor muscles during maximal voluntary isometric contractions (MVIC). Muscle fatigue was assessed during a sustained submaximal contraction. Distance during the 6-MWT, muscle strength and VA were significantly lower in the MS group. MFIS scores were negatively associated with muscle …
-
Dynamic Upper Leg Strength and Neuromuscular Function in Children, Adolescents and Adults
… performance, and neuromuscular function during contractions at different velocities across maturation stages and between sexes. Participants included pre-pubertal, late-pubertal and adult males and females. All completed 8 isometric and 8 isokinetic leg extensions at two different velocities. …
-
Non-Invasive Detection of Anaerobic Metabolism in Exercising Muscle Using Proton MRI
… untreated and then performed 60 1s/min maximal isometric contractions. The intracellular transverse relaxation time (T2,I increased more in NaCN-treated and untreated muscles than in IAA-treated muscles. The VI increase and pHI decrease were greater in NaCN-treated and untreated muscles than in …
-
Ankle mechanical impedance under muscle fatigue
… muscle groups by instructing subjects to perform isometric contractions against a constant ankle torque generated by a backdrivable robot, Anklebot, which interacts with the ankle in two degrees of freedom. Median frequencies of surface electromyographic (EMG) signals collected from tibialis and …
-
Analysis of two methods of isometric muscle contractions during the anti-G straining maneuver
… and Cardiac Output (CO) between two methods of isometric muscle contractions during the Anti-G Straining Maneuver (AGSM). 12 subjects (ages 18 to 38 yrs, height 176.8 +/- 7.4 cm, body mass 78.8 +/- 15.6 kg, percent body fat 14.3 +/- 6.6%) participated in the study. The study was a one-way …
-
Identifying Dosage Effect of LEDT on Muscular Fatigue in Quadriceps
… two sets of three maximal voluntary isometric contractions (MVIC), followed by LEDT on six points across the superficial quadriceps. Each randomized trial consisted of a placebo, 30 seconds, 60 seconds or 120 seconds on each point on the quadriceps. Three minutes after LEDT, the …
-
The surface electromyography-force relationship during isometric dorsiflexion in males and females
… (50 males and 50 females) performed three isometric contractions at 20, 40, 60, 80, and 100% of maximal voluntary contraction (MVC) in an apparatus designed to isolate the action of the dorsiflexors. The surface EMG signal was amplified (lOOOx), band-pass filtered (10-500Hz), and sampled at …
-
The Effect of Ischemic Preconditioning on Rock Climbing Performance
<p>Rock climbing involves isometric contractions of the finger flexors, limiting forearm blood flow and causing ischemia-induced fatigue. Ischemic preconditioning (IPC) has been shown to improve time to failure (TTF) during climbing-specific tasks, though its mechanisms remain unclear. The purpose …
Page 1 of 2