The degenerative loss of skeletal muscle mass occurs at a rate of 0.5–1% per year after the age of 25. This loss of muscle tissue and muscle function due to age is known as sarcopenia (1).
Sarcopenia presents itself as a decrease in size of a muscle (muscle atrophy) and a reduction in the quality of the muscle tissue. It’s caused by:
- Replacement of muscle fibre with fat
- Increase in excess production of fibres, or fibrosis
- Muscle metabolism change
- Oxidative stress
- Degeneration of the connection between the nervous system and muscles (neuromuscular junction)
All of these factors can lead to loss of muscle function and overall frailty. Sarcopenia is effectively battled with an increase in activity and exercise, even in older seniors. All bodily systems require regular exercise to keep them working properly, and an effective workout program does much more than stave off sarconpenia (2).
Sarcopenia mainly effects Type II fibre types (bigger fast-twitch fibres) and to a lesser degree Type I fibre types (slow-twitch fibres) (3). NET’s training principles ensure that all fibre types are stimulated, in particular the fast-twitch fibres, which is crucial for slowing down the aging forces of sarcopenia.
Following NET training principles for approximately six months will make you stronger, lighter on your feet, and help improve your overall quality of life (4).
(2) D.L. Hasten, J. Pak-Loduca, K.A. Obert, K.E. Yarasheski, "Resistance exercise acutely increases MHC and mixed muscle protein synthesis rates in 78-84 and 23-32 yr olds". American Journal of Physiology Endocrinology and Metabolism 278, no. 4, (April 2009): E620–E626. link
K.E. Yarasheski, "Exercise, aging, and muscle protein metabolism". The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences 58, no. 10 (October 2003): M918–M922. link
(3) T.J. Doherty, "Invited review: Aging and sarcopenia". Journal of Applied Physiology 95, no. 4 (2203): 1717–27. link
(4) Kieser Training Works. Study Results. Kieser Training AG, Zurich (2010) link