Page 80 - Color_Atlas_of_Physiology_5th_Ed._-_A._Despopoulos_2003

A. Muscle strength at increasing and decreasing stimulus frequencies
Stimulus
Range of summation
Single contractions
Tetanus
Isometric muscle force 0 2 4 6 8 10 Time (s)

B. Types of contractions Mechanical Features of Skeletal Muscle I

Isometric Isotonic
Force Resting
tension
curve
0
0 Length
Isotonic, then Auxotonic After-
Plate 2.14
isometric loaded

Rest Isometric Rest Isotonic
contraction contraction
C. Isometric muscle force relative to sarcomere length
100 Skeletal muscle
80
Isometric muscle force (% of maximum) 60 Range of max. force Cardiac

40
muscle
20
0
1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6
L max
2.05 2.20

1.90 Actin Myosin
Sarcomere
Sarcomere length (µm) 3.65
1.50 (skeletal muscle)
67
(After Gordon et al.)
Despopoulos, Color Atlas of Physiology © 2003 Thieme
All rights reserved. Usage subject to terms and conditions of license.