scholarly journals Indirect Assessment of Skeletal Muscle Glycogen Content in Professional Soccer Players before and after a Match through a Non-Invasive Ultrasound Technology

Nutrients ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 971 ◽  
Author(s):  
Iñigo San-Millán ◽  
John C. Hill ◽  
Julio Calleja-González
Keyword(s):  
Skeletal Muscle ◽  
Muscle Contraction ◽  
Muscle Glycogen ◽  
Calcium Release ◽  
Glycogen Content ◽  
Soccer Players ◽  
High Frequency Ultrasound ◽  
Non Invasive ◽  
Professional Soccer ◽  
Skeletal Muscle Glycogen

Skeletal muscle glycogen (SMG) stores in highly glycolytic activities regulate muscle contraction by controlling calcium release and uptake from sarcoplasmic reticulum, which could affect muscle contraction. Historically, the assessment of SMG was performed through invasive and non-practical muscle biopsies. In this study we have utilized a novel methodology to assess SMG through a non-invasive high-frequency ultrasound. Nine MLS professional soccer players (180.4 ± 5.9 cm; 72.4 ± 9.3 kg; 10.4% ± 0.7% body fat) participated. All followed the nutritional protocol 24 h before the official match as well as performing the same practice program the entire week leading to the match. The SMG decreased from 80 ± 8.6 to 63.9 ± 10.2; p = 0.005 on MuscleSound® score (0–100) representing a 20% ± 10.4% decrease in muscle glycogen after match. Inter-individual differences in both starting glycogen content (65–90) and in percentage decrease in glycogen after the match (between 6.2% and 44.5%). Some players may not start the match with adequate SMG while others’ SMG decreased significantly throughout the game. Adequate pre-match SMG should be achieved during half-time and game-play in order to mitigate the decrease in glycogen. Further and more ample studies are needed before the application of this technology.

Effects of maternal exercise on liver and skeletal muscle glycogen storage in pregnant rats

1991 ◽  
Vol 71 (3) ◽  
pp. 1015-1019 ◽  
Author(s):  
M. F. Mottola ◽  
P. D. Christopher
Keyword(s):  
Skeletal Muscle ◽  
Muscle Glycogen ◽  
Glycogen Content ◽  
Liver Glycogen ◽  
Glycogen Storage ◽  
Treadmill Running ◽  
Control Group ◽  
Skeletal Muscle Glycogen ◽  
Maternal Exercise ◽  
White Gastrocnemius

To examine the effects of maternal exercise on liver and skeletal muscle glycogen storage, female Sprague-Dawley rats were randomly divided into control, nonpregnant runner, pregnant nonrunning control, pregnant runner, and prepregnant exercised control groups. The exercise consisted of treadmill running at 30 m/min on a 10 degree incline for 60 min, 5 days/wk. Pregnancy alone, on day 20 of gestation, decreased maternal liver glycogen content and increased red and white gastrocnemius muscle glycogen storage above control values (P less than 0.05). In contrast, exercise in nonpregnant animals augmented liver glycogen storage and also increased red and white gastrocnemius glycogen content (P less than 0.05). By combining exercise and pregnancy, the decrease in liver glycogen storage in the pregnant nonexercised condition was prevented in the pregnant runner group and more glycogen was stored in both the red and white portions of the gastrocnemius than all other groups (P less than 0.05). Fetal body weight was greatest (P less than 0.05) in the pregnant runner group and lowest (P less than 0.05) in the prepregnant exercise control group. These results demonstrate that chronic maternal exercise may change maternal glycogen storage patterns in the liver and skeletal muscle with some alteration in fetal outcome.

scholarly journals Skeletal muscle glycogen content in patients with cirrhosis

Hepatology ◽  
1994 ◽  
Vol 20 (1) ◽  
pp. 135-141 ◽  
Author(s):  
Oliver Selberg ◽  
Eva Radoch ◽  
Gerhard Franz Walter ◽  
Manfred James Müller
Keyword(s):  
Skeletal Muscle ◽  
Muscle Glycogen ◽  
Glycogen Content ◽  
Muscle Glycogen Content ◽  
Skeletal Muscle Glycogen

scholarly journals Hepatic and skeletal muscle glycogen content in rats treated with metformin and submitted to acute exercise by swimming

2018 ◽  
Vol 31 (2) ◽  
pp. 355
Author(s):  
Vitor Alexandre Pezolato ◽  
Marcos Almeida Marques ◽  
Fabio Marcos Abreu ◽  
Nataly Mendes Silva ◽  
Ronaldo Júlio Baganha ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Muscle Glycogen ◽  
Acute Exercise ◽  
Glycogen Content ◽  
Muscle Glycogen Content ◽  
Skeletal Muscle Glycogen

O objetivo deste estudo foi avaliar o comportamento das reservas glicogênicas de ratos, submetidos a uma condição de exercício agudo (50 minutos de natação na intensidade leve), após o tratamento com metformina. Quarenta ratos Wistar (180-200g) adultos foram divididos em quatro grupos (tratados ou não por quinze dias) e assim representados: Controle; Exercício agudo por natação (realizaram uma sessão de natação, sendo 50 minutos na intensidade leve); Tratado com metformina (receberam o fármaco metformina na dosagem de 1,4 mg/ml, durante o período experimental; Tratados com metformina e submetidos a condição exercício agudo por natação (receberam o fármaco metformina na dosagem de 1,4 mg/ml e realizaram uma sessão de natação, sendo 50 minutos na intensidade leve). O exercício agudo diminuiu as reservas glicogênicas, já os animais tratados com metformina, apresentaram um aumento em suas reservas glicogênicas musculares e hepáticas em relação ao grupo que realizou o exercício sem suplementação (p0,05). O tratamento com metformina promoveu melhora nas condições energéticas e menor resposta ao estresse, sugerindo ser uma importante ferramenta farmacológica para a potencialização da performance.

scholarly journals Variation of skeletal muscle ultrasound imaging intensity in horses after treadmill exercise: a proof of concept for glycogen content estimation

2021 ◽  
Vol 17 (1) ◽  
Author(s):  
Sarah A. Tabozzi ◽  
Giovanni Stancari ◽  
Enrica Zucca ◽  
Michela Tajoli ◽  
Luca Stucchi ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Muscle Glycogen ◽  
Sports Medicine ◽  
Glycogen Content ◽  
Gluteus Medius ◽  
Small Sample ◽  
Endurance Capacity ◽  
High Frequency Ultrasound ◽  
Aerobic Activity ◽  
Before And After

AbstractBackgroundGlycogen in skeletal muscle is a major source of energy during exercise and an important determinant of endurance capacity, so that its measurement may provide a meaningful marker of athletes’ preparation and a possible predictor of performance, both in humans and in equines. Gold standard of glycogen concentration measurement is the histochemical and biochemical analysis of biopsy-derived muscle tissue, an invasive and potentially injuring procedure. Recently, high-frequency ultrasound (US) technology is being exploited in human sports medicine to estimate muscle glycogen content. Therefore, aim of the present study is to evaluate the feasibility of US assessment of muscle glycogen in equines.ResultsUS images ofgluteus medius(GL) andsemitendinosus(ST) muscles were obtained on eight healthy horses (3–10 years) before and after a steady-state exercise on treadmill (velocity: 4.0–12.5 m/s; duration: 2–20 min; heart rate: 137–218 b/min). Average image greyscale intensity was significantly different between GL and ST, both before and after exercise (p < 0.001). Comparing baseline and post-exercise US images, significant increase in greyscale intensity has been observed in ST (p < 0.001), but not in GL (p = 0.129). The volume of the exercise was significantly correlated with exercise-dependent change in image intensity (R2 = 0.891), consistent with a reduction of glycogen muscle stores resulting from aerobic activity.ConclusionsUS technique evidences also in horses muscle changes possibly associated to glycogen utilisation during exercise. Present results on a small sample need to be further confirmed and provide preliminary data warranting future validation by direct glycogen measurement through biopsy technique.

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