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This issue was discussed in the 12/23/2009 New York Times article "South Korea Stretches Standards for Success"

The Times cites "Yoon Myoung, a top researcher Consumers Korea" stating:

There is no clinical proof or other evidence that these treatments really work

I wanted a more scientific source, however, and found the following article:

Short stature and delayed puberty in gymnasts: Influence of selection bias on leg length and the duration of training on trunk length Journal of Pediatrics vol. 136, pages 149-155.

This research studied gymnantsgymnasts who had been training from a few months to 10 years.

Sitting height decreased (relative to the normal population) with increased years of training.

Though gymnasts with 0-2 years of training showed no significant difference from the normal population, every single gymnast with more than 2 years of training had decreased sitting height, ranging from 0.2 to 2.8 standard deviations below normal.

Leg length was not influenced by duration of training, so this is trunk length that is being influenced.

So gymnasts, who obviously strechstretch more than average, become shorter relative to the general population.

This issue was discussed in the 12/23/2009 New York Times article "South Korea Stretches Standards for Success"

The Times cites "Yoon Myoung, a top researcher Consumers Korea" stating:

There is no clinical proof or other evidence that these treatments really work

I wanted a more scientific source, however, and found the following article:

Short stature and delayed puberty in gymnasts: Influence of selection bias on leg length and the duration of training on trunk length Journal of Pediatrics vol. 136, pages 149-155.

This research studied gymnants who had been training from a few months to 10 years.

Sitting height decreased (relative to the normal population) with increased years of training.

Though gymnasts with 0-2 years of training showed no significant difference from the normal population, every single gymnast with more than 2 years of training had decreased sitting height, ranging from 0.2 to 2.8 standard deviations below normal.

Leg length was not influenced by duration of training, so this is trunk length that is being influenced.

So gymnasts, who obviously strech more than average, become shorter relative to the general population.

This issue was discussed in the 12/23/2009 New York Times article "South Korea Stretches Standards for Success"

The Times cites "Yoon Myoung, a top researcher Consumers Korea" stating:

There is no clinical proof or other evidence that these treatments really work

I wanted a more scientific source, however, and found the following article:

Short stature and delayed puberty in gymnasts: Influence of selection bias on leg length and the duration of training on trunk length Journal of Pediatrics vol. 136, pages 149-155.

This research studied gymnasts who had been training from a few months to 10 years.

Sitting height decreased (relative to the normal population) with increased years of training.

Though gymnasts with 0-2 years of training showed no significant difference from the normal population, every single gymnast with more than 2 years of training had decreased sitting height, ranging from 0.2 to 2.8 standard deviations below normal.

Leg length was not influenced by duration of training, so this is trunk length that is being influenced.

So gymnasts, who obviously stretch more than average, become shorter relative to the general population.

1
source | link

This issue was discussed in the 12/23/2009 New York Times article "South Korea Stretches Standards for Success"

The Times cites "Yoon Myoung, a top researcher Consumers Korea" stating:

There is no clinical proof or other evidence that these treatments really work

I wanted a more scientific source, however, and found the following article:

Short stature and delayed puberty in gymnasts: Influence of selection bias on leg length and the duration of training on trunk length Journal of Pediatrics vol. 136, pages 149-155.

This research studied gymnants who had been training from a few months to 10 years.

Sitting height decreased (relative to the normal population) with increased years of training.

Though gymnasts with 0-2 years of training showed no significant difference from the normal population, every single gymnast with more than 2 years of training had decreased sitting height, ranging from 0.2 to 2.8 standard deviations below normal.

Leg length was not influenced by duration of training, so this is trunk length that is being influenced.

So gymnasts, who obviously strech more than average, become shorter relative to the general population.