Maximal voluntary contraction force, SR function and glycogen resynthesis during the first 72 h after a high-level competitive soccer game

2011 ◽  
Vol 111 (12) ◽  
pp. 2987-2995 ◽  
Author(s):  
Peter Krustrup ◽  
Niels Ørtenblad ◽  
Joachim Nielsen ◽  
Lars Nybo ◽  
Thomas P. Gunnarsson ◽  
...  
Keyword(s):  
Maximal Voluntary Contraction ◽  
Voluntary Contraction ◽  
Contraction Force ◽  
Glycogen Resynthesis ◽  
Soccer Game ◽  
High Level

Metabolism of Exercising and Resting Human Skeletal Muscle, in the Post-Prandial and Fasting States

1973 ◽  
Vol 44 (5) ◽  
pp. 479-491 ◽  
Author(s):  
Patricia G. B. Baker ◽  
R. F. Mottram
Keyword(s):  
Carbon Dioxide ◽  
Skeletal Muscle ◽  
Oxygen Uptake ◽  
Glucose Uptake ◽  
Maximal Voluntary Contraction ◽  
Human Skeletal Muscle ◽  
Voluntary Contraction ◽  
Contraction Force ◽  
Carbon Dioxide Output

1. Methods are described for study of metabolism of human skeletal muscle in situ, at rest and during mild sustained contraction in the fed and fasted states. 2. At rest the average oxygen uptake was 0.29 ml min−1 100 ml of muscle−1 and the carbon dioxide output was 0.22 ml. Glucose uptake was 0.49 mg min−1 100 ml of muscle−1. The respiratory quotient was 0.75, indicating that most of the glucose was being stored. 3. When subjects made hand-grips of 5% of their maximal voluntary contraction force (5% MVC) the oxygen and carbon dioxide exchanges both increased by six times while the glucose uptake increased by 70% of the resting value. 4. A 7 h fast before the observations were made severely decreased both resting and exercising glucose uptake but produced no other alteration in the metabolism of the muscle.

Early Detection of Prolonged Decreases in Maximal Voluntary Contraction Force after Eccentric Exercise of the Knee Extensors

2021 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Cassio V. Ruas ◽  
Christopher Latella ◽  
Janet L. Taylor ◽  
G. Gregory Haff ◽  
Kazunori Nosaka
Keyword(s):  
Early Detection ◽  
Eccentric Exercise ◽  
Maximal Voluntary Contraction ◽  
Voluntary Contraction ◽  
Knee Extensors ◽  
Contraction Force

NMR and analytic biochemical evaluation of CrP and nucleotides in the human calf during muscle contraction

1993 ◽  
Vol 74 (4) ◽  
pp. 2034-2039 ◽  
Author(s):  
J. Bangsbo ◽  
L. Johansen ◽  
B. Quistorff ◽  
B. Saltin
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Maximal Voluntary Contraction ◽  
Work Load ◽  
Voluntary Contraction ◽  
Isometric Contractions ◽  
Contraction Force ◽  
Biochemical Evaluation ◽  
Male Subjects ◽  
Human Calf

This study compared biochemical and 31P-nuclear magnetic resonance (NMR) determinations of energy metabolites during isometric contractions of the human calf muscle at various exercise intensities. Seven male subjects performed one-legged isometric contractions at a work load of 28, 64, and 90% of maximal voluntary contraction force (28-, 64-, and 90%-CON, respectively) for 3 min, 40 s, and 40 s, respectively, in a magnet and in an exact model of the magnet with an arrangement for rapid muscle biopsy sampling from the gastrocnemius. The decrease in phosphocreatine (CrP) determined by NMR was 20, 33, and 71% for 28%-, 64%-, and 90%-CON, respectively. These decreases were the same as those determined biochemically (25, 34, and 61%, respectively). Muscle CrP 1 min after 90%-CON was also found to be similar between NMR and biochemical determinations (88 and 74% of resting value, respectively). Although no significant change in muscle ATP was found by NMR, a decrease of 29% was observed biochemically at 90%-CON. The ratio between muscle CrP and ATP was the same between NMR and biochemical determinations except for 90%-CON (1.98 and 0.78, respectively). The increase in muscle ADP determined by NMR was two-, five-, and eightfold higher than that found biochemically for 28%-, 64%-, and 90%-CON, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)

scholarly journals Leg Immersion in Warm Water, Stretch-Shortening Exercise, and Exercise-Induced Muscle Damage

2008 ◽  
Vol 43 (6) ◽  
pp. 592-599 ◽  
Author(s):  
Albertas Skurvydas ◽  
Sigitas Kamandulis ◽  
Aleksas Stanislovaitis ◽  
Vytautas Streckis ◽  
Gediminas Mamkus ◽  
...  
Keyword(s):  
Creatine Kinase ◽  
Muscle Damage ◽  
Maximal Voluntary Contraction ◽  
Muscle Soreness ◽  
Muscle Length ◽  
Voluntary Contraction ◽  
Warm Water ◽  
Jump Height ◽  
Contraction Force ◽  
Exercise Induced

Abstract Context: Whether muscle warming protects against exercise-induced muscle damage is unknown. Objective: To determine the effect of leg immersion in warm water before stretch-shortening exercise on the time course of indirect markers of exercise-induced muscle damage. Design: Crossover trial. Setting: Human kinetics laboratory. Patients or Other Participants: Eleven healthy, untrained men (age  =  21.5 ± 1.7 years). Intervention(s): Participants' legs were immersed in a water bath at 44 ± 1°C for 45 minutes. Main Outcome Measure(s): Creatine kinase changes in the blood, muscle soreness, prolonged (within 72 hours) impairment in maximal voluntary contraction force and height of drop jump, and electrically evoked muscle force at low and high stimulation frequencies at short and long muscle lengths. Results: Leg immersion in warm water before stretch-shortening exercise reduced most of the indirect markers of exercise-induced muscle damage, including creatine kinase activity in the blood, muscle soreness, maximal voluntary contraction force, and jump height. The values for maximal voluntary contraction force and jump height, however, were higher during prewarming than for the control condition at 48 hours after stretch-shortening exercise, but this difference was only minor at other time points. Muscle prewarming did not bring about any changes in the dynamics of low-frequency fatigue, registered at either short or long muscle length, within 72 hours of stretch-shortening exercise. Conclusions: Leg immersion in warm water before stretch-shortening exercise reduced most of the indirect markers of exercise-induced muscle damage. However, the clinical application of muscle prewarming may be limited, because decreasing muscle damage did not necessarily lead to improved voluntary performance.

scholarly journals Time to task failure and muscle activation vary with load type for a submaximal fatiguing contraction with the lower leg

2008 ◽  
Vol 105 (2) ◽  
pp. 463-472 ◽  
Author(s):  
Sandra K. Hunter ◽  
Tejin Yoon ◽  
Joseph Farinella ◽  
Erin E. Griffith ◽  
Alexander V. Ng
Keyword(s):  
Maximal Voluntary Contraction ◽  
Muscle Activation ◽  
Lower Leg ◽  
Voluntary Contraction ◽  
Medial Gastrocnemius ◽  
Emg Activity ◽  
Time To Failure ◽  
Contraction Force ◽  
Task Failure ◽  
Position Task

The purpose was to compare the time to failure and muscle activation patterns for a sustained isometric submaximal contraction with the dorsiflexor muscles when the foot was restrained to a force transducer (force task) compared with supporting an equivalent inertial load and unrestrained (position task). Fifteen men and women (mean ± SD; 21.1 ± 1.4 yr) performed the force and position tasks at 20% maximal voluntary contraction force until task failure. Maximal voluntary contraction force performed before the force and position tasks was similar (333 ± 71 vs. 334 ± 65 N), but the time to task failure was briefer for the position task (10.0 ± 6.2 vs. 21.3 ± 17.8 min, P < 0.05). The rate of increase in agonist root-mean-square electromyogram (EMG), EMG bursting activity, rating of perceived exertion, fluctuations in motor output, mean arterial pressure, and heart rate during the fatiguing contraction was greater for the position task. EMG activity of the vastus lateralis (lower leg stabilizer) and medial gastrocnemius (antagonist) increased more rapidly during the position task, but coactivation ratios (agonist vs. antagonist) were similar during the two tasks. Thus the difference in time to failure for the two tasks with the dorsiflexor muscles involved a greater level of neural activity and rate of motor unit recruitment during the position task, but did not involve a difference in coactivation. These findings have implications for rehabilitation and ergonomics in minimizing fatigue during prolonged activation of the dorsiflexor muscles.

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