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Howard G. Smith, M.D. is a former radio medical editor and talk show host in the Boston Metro area. His "Medical Minute" of health and wellness news and commentary was a regular weekday feature on WBZ-AM, WRKO-AM, and WMRE-AM. His popular two-way talk show, Dr. Howard Smith OnCall, was regularly heard Sunday morning and middays on WBZ.

Dr. Smith has adopted audio and video podcasting as conduits for HEALTH NEWS YOU SHOULD USE. Based on the latest medical, health, and wellness literature these reports provide practical information you can use to keep yourself and your family healthy. Many reports have video versions, and Dr. Smith’s YouTube Channel may be found at: http://bit.ly/2rNw6XQ

Trained at Harvard Medical School and a long-time faculty member at Boston Children’s Hospital, he practiced Pediatric Otolaryngology for 40 years in Boston, Southern California, and in central Connecticut.  He is now based in New York City.

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  2. Strength Training Saps Endurance

Strength Training Saps Endurance

Aug 2, 2019

Vidcast:  ttps://youtu.be/9BYS4pPwd8M

 

When you exercise for stronger muscles and increase your numbers of muscle strength fibers, you produce a neurotransmitter called Brain-Derived Neurotrophic Factor or BDNF.  This messenger then drives atrophy of your endurance muscle fibers.  

 

This Yin-Yang relationship is newly described in a study from  Switzerland’s University of Basel.  This BDNF chemical is produced by the muscle itself in response to strengthening exercises.  It triggers remodeling of muscle from slow-twitch endurance fibers into fast-twitch strength fibers.

 

The investigators also showed that lower levels of BDNF in the muscles of seniors was associated with less decline of muscle bulk with aging.  That would suggest strength training is contraindicated for our elders.

 

Julien Delezie, Martin Weihrauch, Geraldine Maier, Rocío Tejero, Daniel J. Ham, Jonathan F. Gill, Bettina Karrer-Cardel, Markus A. Rüegg, Lucía Tabares, Christoph Handschin. BDNF is a mediator of glycolytic fiber-type specification in mouse skeletal muscle. Proceedings of the National Academy of Sciences, 2019; 201900544 DOI: 10.1073/pnas.1900544116

 

#Strength #endurance #BDNF #muscleatrophy