Okay, so the title of my blog sounds a bit paradoxical, or hypocritical, but give me a minute or two to explain myself.
Let me break this down real fast: Most people run for goals or reasons based outside of performance; at least among the general population. And since most of those people are running for weight loss and not for pure enjoyment or for any specific training protocol; I am a little concerned. And here’s why:
There is a little thing we call Ground Reaction Forces – This is the force the ground sounds back up through our musculoskeletal systems once our bodies and gravity have been applied to the surface. And here’s why it’s important and alarming at the same time:
1) Walking = 1-1.5 x’s one’s body weight is transmitted back through our system
2) Running = 2-5 x’s ones body weight is transmitted back through our system
3)Jumping = 4-11 x’s ones body weight is transmitted back through our system
Wow!!! Maybe those numbers don’t rock your world like mine just yet, so let me put this into perspective based on a 160 lb person.
1) 160-240 lbs of force is pushed back up into the body
2)320-800 lbs of force is pushed back up into the body
3)640-1,760 lbs of force is pushed back up into the body
Now take those numbers from line #2 and imagine that , but stretched out over a course of a several thousand times, like during a typical 2-3 mile run. Now you catch my drift.
I just wanted to explain that if weight loss is your goal, there is much more effective ways to reduce body fat, build muscle and strengthen our bodies other than wrenching your ankle, knee and hip joints to the max; as in circuit or metabolic training.
Hope you enjoyed the food for thought. Happy lifting!!
Biomechanical Basis of Human Movement. Baltimore, MD: Williams & Wilkins; 1995.
The influence of walking speed on dynamic loading on the human musculoskeletal system. Med Sci Sport Exerc 2000; 32:1156-9