Choline-Based Multi-Ingredient Supplementation Can Improve Explosive Strength during a Fatiguing Task

Various choline-based multi-ingredient supplementations (CMS) have been suggested in the current market, but the research is limited. The purpose of this study was to investigate the acute effect of a CMS on physical performance. Fourteen male college football players (20.4 ± 1.0 years) participated in a randomized double-blind crossover experiment separated by 7 days. Subjects were given a CMS or a placebo 60 min before physical performance testing measures, including maximum vertical jumps, maximum voluntary isometric contractions (MVIC), maximal voluntary concentric contractions (MVCC), and fatiguing contractions. Four MVICs and seven sets of two MVCCs at various loads (1 N·m to 60% MVIC torque) were performed with the knee extensor muscles while seated on a dynamometer before and after the fatiguing tasks. During the fatiguing tasks, 120 MVCCs (4 sets × 30 reps) were performed with a load equivalent to 20% MVIC. Twitch interpolation technique was used to assess muscle contractile properties and voluntary activation. No significant differences were seen at baseline between sessions for all testing measures including vertical jump height, strength, power, muscle contractile properties and voluntary activation. Rate of torque development and impulse was higher in supplemental session compared to control session throughout the fatiguing contractions (p = 0.018, p < 0.001, respectively). Acute CMS can improve explosive strength by delaying the onset of fatigue.

Download Full-text

Effect of caffeine on skeletal muscle function before and after fatigue

Journal of Applied Physiology ◽

10.1152/jappl.1983.54.5.1303 ◽

1983 ◽

Vol 54 (5) ◽

pp. 1303-1305 ◽

Cited By ~ 80

Author(s):

J. M. Lopes ◽

M. Aubier ◽

J. Jardim ◽

J. V. Aranda ◽

P. T. Macklem

Keyword(s):

Skeletal Muscle ◽

Electrical Stimulation ◽

Relaxation Rate ◽

Voluntary Contraction ◽

Contractile Properties ◽

Double Blind ◽

Caffeine Ingestion ◽

Muscle Contractile Properties ◽

Before And After ◽

Muscle Contractile

We studied the effect of caffeine on voluntary and electrically stimulated contractions of the adductor pollicis muscle in five adult volunteers. Caffeine (500 mg) was administered orally in a double-blind fashion. Electrical stimulation of the ulnar nerve was performed at 10, 20, 30, 50, and 100 Hz before and after a sustained voluntary contraction held at 50% of the maximal voluntary contraction (MVC). A brief tetanus at 30 Hz was also performed to calculate relaxation rate in the fresh muscle. Contractile properties, relaxation rate, and endurance were then assessed after caffeine and placebo, as well as the response of the fatigued muscle to different frequencies of stimulation. There was no difference in the maximal tension obtained with electrical stimulation (T100) or in the MVC between placebo and caffeine. The tensions developed with electrical stimulation at lower frequencies increased significantly with caffeine ingestion, shifting the frequency-force curve to the left, both before and after fatigue. Mean plasma caffeine concentration associated with these responses was 12.2 +/- 4.9 mg/l. We conclude that caffeine has a direct effect on skeletal muscle contractile properties both before and after fatigue as demonstrated by electrical stimulation.

Download Full-text

Influence of artificial turf temperature on physical performance and muscle contractile properties in football players after a repeated-sprint ability test

Scientific Reports ◽

10.1038/s41598-020-69720-6 ◽

2020 ◽

Vol 10 (1) ◽

Author(s):

Gabriel Calderón-Pellegrino ◽

Leonor Gallardo ◽

Víctor Paredes-Hernández ◽

Jorge García-Unanue ◽

Jesus Vicente Giménez ◽

...

Keyword(s):

Physical Performance ◽

Contractile Properties ◽

Football Players ◽

Artificial Turf ◽

Ability Test ◽

Muscle Contractile Properties ◽

Repeated Sprint Ability ◽

Repeated Sprint ◽

Muscle Contractile ◽

Sprint Ability

Download Full-text

Use of motor cortex stimulation to measure simultaneously the changes in dynamic muscle properties and voluntary activation in human muscles

Journal of Applied Physiology ◽

10.1152/japplphysiol.00962.2006 ◽

2007 ◽

Vol 102 (5) ◽

pp. 1756-1766 ◽

Cited By ~ 45

Author(s):

Gabrielle Todd ◽

Janet L. Taylor ◽

Jane E. Butler ◽

Peter G. Martin ◽

Robert B. Gorman ◽

...

Keyword(s):

Motor Cortex ◽

Muscle Contraction ◽

Motor Nerve ◽

Contractile Properties ◽

Voluntary Activation ◽

Relaxation Rates ◽

Muscle Contractile Properties ◽

Fatigued Muscle ◽

Voluntary Contractions ◽

Muscle Contractile

Force responses to transcranial magnetic stimulation of motor cortex (TMS) during exercise provide information about voluntary activation and contractile properties of the muscle. Here, TMS-generated twitches and muscle relaxation during the TMS-evoked silent period were measured in fresh, heated, and fatigued muscle. Subjects performed isometric contractions of elbow flexors in two studies. Torque and EMG were recorded from elbow flexor and extensor muscles. One study ( n = 6) measured muscle contraction times and relaxation rates during brief maximal and submaximal contractions in fresh and fatigued muscle. Another study ( n = 7) aimed to 1) assess the reproducibility of muscle contractile properties during brief voluntary contractions in fresh muscle, 2) validate the technique for contractile properties in passively heated muscle, and 3) apply the technique to study contractile properties during sustained maximal voluntary contractions. In both studies, muscle contractile properties during voluntary contractions were compared with the resting twitch evoked by motor nerve stimulation. Measurement of muscle contractile properties during voluntary contractions is reproducible in fresh muscle and reveals faster and slower muscle relaxation rates in heated and fatigued muscle, respectively. The technique is more sensitive to altered muscle state than the traditional motor nerve resting twitch. Use of TMS during sustained maximal contractions reveals slowing of muscle contraction and relaxation with different time courses and a decline in voluntary activation. Voluntary output from the motor cortex becomes insufficient to maintain complete activation of muscle, although slowing of muscle contraction and relaxation indicates that lower motor unit firing rates are required for fusion of force.

Download Full-text

The effect of lower limb muscle contractile properties on walking

Korean Journal of Sports Science ◽

10.35159/kjss.2018.12.27.6.1137 ◽

2018 ◽

Vol 27 (6) ◽

pp. 1137-1149

Author(s):

Chul-Min Chung ◽

Sung-Hoon Shin

Keyword(s):

Lower Limb ◽

Contractile Properties ◽

Lower Limb Muscle ◽

Limb Muscle ◽

Muscle Contractile Properties ◽

Muscle Contractile

Download Full-text

Effects of selenium supplementation on the muscle contractile properties, fatigue and antioxidant enzymes activities of gastrocnemius muscles in trained and untrained rats

South Asian Journal of Experimental Biology ◽

10.38150/sajeb.1(4).p226-232 ◽

2011 ◽

Vol 1 (4) ◽

pp. 226-232

Author(s):

Mohanad R. Alwan ◽

Oleksandr Krasilshchikov ◽

Tengku Muzaffar Bin ◽

Tengku Mohamad Shihabudin

Keyword(s):

Lipid Peroxidation ◽

Selenium Supplementation ◽

Contractile Properties ◽

Muscle Contractile Properties ◽

Body Weights ◽

Jumping Exercise ◽

Antioxidant Enzymes Activities ◽

Gastrocnemius Muscles ◽

Muscle Contractile ◽

Tetanic Tension

Selenium (Se) is an important component of cellular seleno Ã¢â‚¬Âcompounds andan integral component of glutathione Peroxidase (GPx), which catalyzes thereduction of harmful radicals produced during muscular exercise. The currentstudy was carried out to evaluate the muscle contractile properties andfatigue resistance of gastrocnemius muscle under selenium supplementationschemes in sedentary and exercise protocols as well as measure the antioxidantenzymes activity and lipid peroxidation. Rats were divided into fourgroups; sedentary Selenium supplementation (S), exercise Selenium (SE)groups, sedentary control (SC) and exercise control (EC) groups. The ratswere fed with 80 μg/kg body weights selenium for six weeks. The exerciseprotocol consisted the 40 jumps up to the height of 40 cm for 6 Ã¢â‚¬Âweek. Themuscle fatigue protocol consisted the trains of pulses of 40 Hz at every secondfor at least 2 min. Significant (P<0.05) increase was observed in treatedgroups than control in the muscle contractile properties like twitch tension(Pt), contraction time (CT) and twitch/tetanic tension Ratio (Pt/Po Ratio),tetanic tension (Po) and EMG amplitude. Decreased EMG failure and increasedfatigue index were observed in ES group. Moreover, a significant(P<0.05) increase and decrease in the GPx activity and lipid peroxidation respectivelywas also reported than SC and EC group. While there were nochanges reported in the activity of CAT and SOD enzymes. This study revealedthat the Se with jumping exercise induces muscle contractile propertiesand decreases the muscular fatigue.

Download Full-text

Muscle Contractile Properties Measured at Submaximal Electrical Amplitudes and Not at Supramaximal Amplitudes Are Associated with Repeated Sprint Performance and Fatigue Markers

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph182111689 ◽

2021 ◽

Vol 18 (21) ◽

pp. 11689

Author(s):

Alejandro Muñoz-López ◽

Moisés de Hoyo ◽

Borja Sañudo

Keyword(s):

Rectus Femoris ◽

Peak Torque ◽

Sprint Performance ◽

Contractile Properties ◽

Practical Significance ◽

Contraction Time ◽

Repeated Sprints ◽

Muscle Contractile Properties ◽

Repeated Sprint ◽

Muscle Contractile

Background: The present study analyzes the associations between the muscle contractile properties (MCP) measured at different neuromuscular electrical stimulation amplitudes (NMESa) and the performance or transient fatigue after a bout of repeated sprints. Methods: Seventeen physically active male subjects performed six repeated sprints of 30 m with 30 s of passive recovery. Capillary blood creatine kinase (CK) concentration, knee extension or flexion isometric peak torque, tensiomyography, and repeated sprint performance were assessed. Results: Muscle displacement and contraction time were different in relation to the NMESa used in the rectus femoris and biceps femoris muscles. At rest, significant (p < 0.05) associations were found between muscle displacement and the loss of time in the repeated sprints (sprint performance) at 20 or 40 mA in the rectus femoris. At post +24 h or +48 h, the highest significant associations were found between the muscle displacement or the contraction time and CK or peak torques also at submaximal amplitudes (20 mA). The NMESa which elicits the peak muscle displacement showed lack of practical significance. Conclusion: Although MCP are typically assessed in tensiomyography using the NMESa that elicit peak muscle displacement, a submaximal NMESa may have a higher potential practical application to assess neuromuscular fatigue in response to repeated sprints.

Download Full-text