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. 2017 Aug 11;5(15):e13374. doi: 10.14814/phy2.13374

Table 1.

Morphological and mechanical properties of muscles for plyometric and isometric training protocols [mean (SD)]

Plyometric training Isometric training
Before After Before After
MVC (Nm) 103.3 (7.6) 107.3 (9.4)* 104.3 (16.7) 124.8 (15.0)***
Muscle thickness of MG (mm) 17.7 (1.7) 18.8 (2.2)** 18.1 (1.8) 19.0 (1.9)***
Muscle thickness of LG (mm) 16.0 (2.3) 16.9 (2.4)** 15.5 (2.5) 16.4 (2.6)**
Muscle thickness of SOL (mm) 15.3 (2.5) 16.1 (2.4)*** 15.9 (1.9) 16.8 (2.4)**
Muscle thickness of PF (mm) 16.3 (1.5) 17.3 (1.6)*** 16.5 (1.7) 17.4 (1.9)***
Active muscle stiffness at 30%MVC (N·mm−1) 32.3 (8.6) 44.6 (9.6)** 35.9 (10.7) 40.3 (8.1)
Active muscle stiffness at 50%MVC (N·mm−1) 48.2 (15.5) 77.0 (24.3)** 49.4 (14.2) 60.4 (18.5)
Active muscle stiffness at 70%MVC (N·mm−1) 63.9 (17.8) 108.4 (16.7)*** 72.4 (16.8) 89.5 (27.4)
Passive muscle stiffness (N·mm) 7.35 (3.30) 7.30 (1.86) 7.39 (3.09) 7.47 (2.17)

Significantly different from before (*P < 0.05, **P < 0.01, ***P < 0.001). MVC, maximum voluntary contraction; MG, medial gastrocnemius muscle; LG, lateral gastrocnemius muscle; SOL, soleus muscle, PF, plantar flexor muscles.