Muscle Typology and Strength Training Adaptations

Influence of Muscle Typology and Training Frequency on Chronic Strength Training Adaptations

The overall aim of this project is to investigate if the responsiveness to chronic resistance training is dependent on the muscle typology. In a second aim we will investigate the most optimal training frequency for slow-twitchers and fast-twitchers. For the latter we hypothesize that slow-twitchers might cope better with higher frequencies and higher volumes compared to fast-twitchers.

Male and female adult participants (18-45y) will be recruited. The subjects' muscle typology will be non-invasively estimated in the leg muscles by measurement of muscle carnosine using H-MRS. In total 21 subjects (11 slow and 10 fast subjects) will participate. Subjects will be assigned to a whole-body resistance training exercise protocol of 9 weeks in wich arm A and leg A will train 3 times per week and arm B and leg B will train 2 times per week. Before and following the training period, subjects will be subjected to different measurements (fitness level, muscle volume, strength tests, blood sampling, muscle biopsies).

Inclusion Criteria:

• Fast or slow muscle typology
• 18 - 45 years old
• no strength training experience

Exclusion Criteria:

• Vegan/vegeterian diet
• Supplement intake
• chronic diseases
• Hypertension,
• Smoking
• Medication use
• Coagulation disorder, infectious diseases