1. Molecular aspects of declining sperm motility in older men
Ralf Henkel, Ph.D., Gesa Maass, M.D., Hans-Christian Schuppe, M.D., Andreas Jung, M.D., Jörg Schubert, M.D., Wolf-Bernhard Schill, M.D. 
Fertility and Sterility 
Volume 84, Issue 5, Pages (November 2005)
DOI: /j.fertnstert
Copyright © 2005 American Society for Reproductive Medicine Terms and Conditions

2. FIGURE 1
Correlation of (A) total and (B) progressive sperm motility with age. Highly significant decreases in sperm motility are obvious as age increases.
Heinkel. Sperm motility in older men. Fertil Steril 2005.
Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2005 American Society for Reproductive Medicine Terms and Conditions

3. FIGURE 2 Correlation of flagellar zinc concentration with age.
Heinkel. Sperm motility in older men. Fertil Steril 2005.
Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2005 American Society for Reproductive Medicine Terms and Conditions

4. FIGURE 3
Correlation of flagellar zinc concentration with percentage of abnormally stained flagella.
Heinkel. Sperm motility in older men. Fertil Steril 2005.
Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2005 American Society for Reproductive Medicine Terms and Conditions