- 203-Sarcopenia : Twenty Open Questions for a Research Agenda

The term “sarcopenia” is used to indicate the progressive reduction in muscle mass and muscle strength that affect older persons and cause a large percentage of late-life disability. Searching for potential targets for intervention, many studies are currently focusing on the pathophysiologic mechanisms that may explain the development of sarcopenia, and in particular on the signaling pathways involved in this process. Other mechanisms being studied include physical inactivity, oxidative stress, chronic inflammation and general changes in body composition. Exercise is the only intervention that can prevent and, to a certain extent, reduce sarcopenia in older individuals. However, the relationship between physical activity and the intrinsic process of sarcopenia remain unclear. Current efforts are aimed at understanding whether some genetic characteristics exist that increase the risk of sarcopenia. In this review, we provide a list of 20 research questions that are likely to find answers in the near future.

[1]  S. Bandinelli,et al.  Chronic inflammation and the effect of IGF-I on muscle strength and power in older persons. , 2003, American journal of physiology. Endocrinology and metabolism.

[2]  Suzanne G. Leveille,et al.  Change in Muscle Strength Explains Accelerated Decline of Physical Function in Older Women With High Interleukin‐6 Serum Levels , 2002, Journal of the American Geriatrics Society.

[3]  E. Metter,et al.  Influence of age, sex, and strength training on human muscle gene expression determined by microarray. , 2002, Physiological genomics.

[4]  F. Booth,et al.  Exercise and gene expression: physiological regulation of the human genome through physical activity , 2002, The Journal of physiology.

[5]  A. Newman,et al.  Relationship of interleukin-6 and tumor necrosis factor-alpha with muscle mass and muscle strength in elderly men and women: the Health ABC Study. , 2002, The journals of gerontology. Series A, Biological sciences and medical sciences.

[6]  Craig R Denegar,et al.  Creatine supplementation improves muscular performance in older men. , 2002, Medicine and science in sports and exercise.

[7]  Suzanne G. Leveille,et al.  The Relationship Between Leg Power and Physical Performance in Mobility‐Limited Older People , 2002, Journal of the American Geriatrics Society.

[8]  D J Glass,et al.  Identification of Ubiquitin Ligases Required for Skeletal Muscle Atrophy , 2001, Science.

[9]  P. Ridker,et al.  Effect of marathon running on inflammatory and hemostatic markers. , 2001, The American journal of cardiology.

[10]  S. Anker,et al.  High tumour necrosis factor-alpha levels are associated with exercise intolerance and neurohormonal activation in chronic heart failure patients. , 2001, Cytokine.

[11]  A. Goldberg,et al.  What do we really know about the ubiquitin-proteasome pathway in muscle atrophy? , 2001, Current opinion in clinical nutrition and metabolic care.

[12]  L. Ji Exercise at Old Age: Does It Increase or Alleviate Oxidative Stress? , 2001, Annals of the New York Academy of Sciences.

[13]  J. Polak,et al.  Association between physical activity and markers of inflammation in a healthy elderly population. , 2001, American journal of epidemiology.

[14]  W. Evans,et al.  Skeletal muscle PGF(2)(alpha) and PGE(2) in response to eccentric resistance exercise: influence of ibuprofen acetaminophen. , 2001, The Journal of clinical endocrinology and metabolism.

[15]  K. Yarasheski,et al.  Resistance exercise decreases skeletal muscle tumor necrosis factor alpha in frail elderly humans. , 2001, FASEB journal : official publication of the Federation of American Societies for Experimental Biology.

[16]  M. Messi,et al.  The Specific Force of Single Intact Extensor Digitorum Longus and Soleus Mouse Muscle Fibers Declines with Aging , 2000, The Journal of Membrane Biology.

[17]  J. Fleg,et al.  Effects of age, gender, and myostatin genotype on the hypertrophic response to heavy resistance strength training. , 2000, The journals of gerontology. Series A, Biological sciences and medical sciences.

[18]  W. Ettinger,et al.  Long‐Term Exercise and its Effect on Balance in Older, Osteoarthritic Adults: Results from the Fitness, Arthritis, and Seniors Trial (FAST) , 2000, Journal of the American Geriatrics Society.

[19]  I. Mertens,et al.  Reduction of the plasma concentration of C-reactive protein following nine months of endurance training. , 2000, International journal of sports medicine.

[20]  Luigi Ferrucci,et al.  Serum IL‐6 Level and the Development of Disability in Older Persons , 1999, Journal of the American Geriatrics Society.

[21]  P. Clarkson,et al.  Effects of 30 days of creatine ingestion in older men , 1999, European Journal of Applied Physiology and Occupational Physiology.

[22]  R Conwit,et al.  Muscle quality and age: cross-sectional and longitudinal comparisons. , 1999, The journals of gerontology. Series A, Biological sciences and medical sciences.

[23]  J. Fleg,et al.  Muscle quality. I. Age-associated differences between arm and leg muscle groups. , 1999, Journal of applied physiology.

[24]  J. Kehayias,et al.  THE RELATIONSHIP BETWEEN GROWTH HORMONE KINETICS AND SARCOPENIA IN POSTMENOPAUSAL WOMEN : THE ROLE OF FAT MASS AND LEPTIN , 1998 .

[25]  A. Claessens,et al.  Inheritance of static and dynamic arm strength and some of its determinants. , 1998, Acta physiologica Scandinavica.

[26]  S. Heymsfield,et al.  Epidemiology of sarcopenia among the elderly in New Mexico. , 1998, American journal of epidemiology.

[27]  R. Conwit,et al.  Age-associated loss of power and strength in the upper extremities in women and men. , 1997, The journals of gerontology. Series A, Biological sciences and medical sciences.

[28]  N. Agell,et al.  TNF can directly induce the expression of ubiquitin-dependent proteolytic system in rat soleus muscles. , 1997, Biochemical and biophysical research communications.

[29]  J. Lexell,et al.  Sarcopenia and physical performance in old age: Overview , 1997, Muscle & nerve. Supplement.

[30]  M. Yano,et al.  Interleukin 6 receptor antibody inhibits muscle atrophy and modulates proteolytic systems in interleukin 6 transgenic mice. , 1996, The Journal of clinical investigation.

[31]  H. Northoff,et al.  The cytokine response to strenuous exercise. , 1994, International journal of sports medicine.

[32]  E Heikkinen,et al.  Maximal isometric strength and mobility among 75-year-old men and women. , 1994, Age and ageing.

[33]  W. Ershler,et al.  Interleukin‐6: A Cytokine for Gerontolgists , 1993, Journal of the American Geriatrics Society.

[34]  P. Bechtel,et al.  Activation of insulin-like growth factor gene expression during work-induced skeletal muscle growth. , 1990, The American journal of physiology.

[35]  L. Lipsitz,et al.  High-intensity strength training in nonagenarians. Effects on skeletal muscle. , 1990, JAMA.

[36]  E. Krokowski [Definition and diagnosis of osteoporosis]. , 1966, Munchener medizinische Wochenschrift.