Do the anatomical and physiological properties of a muscle determine its adaptive response to different loading protocols?

• DOI: 10.14814/phy2.14427
• Publication Date: 2020-04-28T05:52:20Z
• Authors: Brad J. Schoenfeld; Andrew D. Vigotsky; Jozo Grgic; Cody Haun; Bret Contreras; Kenneth Delcastillo; Aston Francis; Gilda Cote; Andrew Alto
• Keywords: Gastrocnemius muscle; Triceps surae muscle

It has been proposed that superior muscle hypertrophy may be obtained by training muscles predominant in type I fibers with lighter loads and those II heavier loads. Purpose To evaluate longitudinal changes strength of the soleus (a predominantly slow-twitch muscle) gastrocnemius (muscle a similar composition slow fast-twitch fibers) when subjected to light (20–30 repetition maximum) heavy (6–10 load plantarflexion exercise. Methods The study employed within-subject design whereby 26 untrained young men had their lower limbs randomized perform low-load (LIGHT) high-load (HEAVY) for 8 weeks. Muscle thickness was estimated via B-mode ultrasound maximal determined isometric dynamometry. Results showed were regardless magnitude used training. Furthermore, each calf demonstrated robust hypertrophy, lateral showing greater gains compared medial soleus. Both HEAVY LIGHT programs elicited hypertrophic increases triceps surae. Finally, between loading conditions. Conclusions surae respond robustly regimented exercise measures appear independent fiber composition. Moreover, provides further evidence is viable strategy increase different human muscles, observed using