How Much Force Or Load Do Resistance Bands Produce?
Page et al. (2000) analysed the Thera-Band® brand of elastic resistance bands and discovered the following:
- The resistance band output depends on how much the band or tubing stretched, or "per cent elongation".
- The "per cent elongation" that the elastic stretches relate to increases length from its resting length.
Using a "force elongation" chart, you can predict the force at a specific per cent elongation for Thera-Band® colours. For example, if your 0.5-metre length of Blue Thera-Band®, then when you stretched it to 1.5 metres (200% elongation), you'd have about 5 kilograms of force. Extended to 2.0 metres (300% elongation), you'd have about 7 kilograms of force.
What's the Effect of Multiple Resistance Bands?
If you use two resistance bands or double up your resistance bands simultaneously, you will double the force so, if you double up a 0.5-metre length of black Thera-Band® and elongate to 2.0 metres, you'd be producing about 18.4 kgs of force.
Three bands treble the force, which would produce 27.6 kgs of force in the same scenario.
Page, et al. JOSPT 30(1): A47. 2000
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