Testosterone is the predominant male
hormone. Testosterone is converted to DHT which produces
male sexual characteristics. If testosterone is not converted
to DHT, it is converted to estradiol, the female hormone
which generates the female appearance such as enlarged breast,
reduced body hair.
The daily production of testosterone
in young healthy men is 7mg a day. The circadian rhythm
of testosterone is 20% higher in the morning than evening.
Testosterone producing leydig cells dies
in the testicles every 4 seconds. Only one-third of the
700 million leydig cells remain at age 70-80 and free testosterone
levels decreases by more than 50% in the blood and urine.
Thus men will experience the mental and physical symptoms
of testosterone deficiency.
Roles of testosterone in men
- safeguards the cardiovascular system
- maintains reproductive health, sexual
potency, prostate , body hair
- supports the brain and nerve by increasing
- sustains the bones
- improves mood and memory
- Protects against obesity and
diabetes, reducing fat mass and increasing lean muscle
Lab test to confirm diagnosis of testosterone
in men include total testosterone, androstanediol glucuronide,
SHBG, estradiol, FSH, 24 hr urine testosterone, androsterone
Aging men have elevated estrogens
in the blood, especially estradiol. This is because older
men have more body fat. High estrogen levels are associated
with aging problems such gynaecomastia, impotence, benign
Achieving peak performance in your
fitness is a science. It is important to know how your muscles
work, how to fuel the muscles with glycogen stores before
and after exercise and which nutrients to take. A 4:1 carbohydrate
to protein ratio has been shown to increase athlete’s
performance during training. This is important as it helps
preserve muscle glycogen, maintain glucose levels, minimize
cortisol increase and enable you to recover faster.