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Taken from WWW.pubmed.gov
J Am Coll Cardiol. 2009 Sep 1;54(10):919-27.
Effect of long-acting testosterone treatment on functional exercise capacity, skeletal muscle
performance, insulin resistance, and baroreflex sensitivity in elderly patients with chronic heart failure
a double-blind, placebo-controlled, randomized study.
Caminiti G, Volterrani M, Iellamo F, Marazzi G, Massaro R, Miceli M, Mammi C, Piepoli M, Fini M, Rosano GM.
Centre for Clinical and Basic Research, Cardiovascular Research Unit, Department of Medical Sciences, IRCCS San Raffaele
Pisana, Rome, Italy.
OBJECTIVES: This study investigated the effect of a 12-week long-acting testosterone administration on maximal
exercise capacity, ventilatory efficiency, muscle strength, insulin resistance, and baroreflex sensitivity (BRS) in elderly
patients with chronic heart failure (CHF).
BACKGROUND: CHF is characterized by a metabolic shift favoring catabolism and impairment in skeletal muscle bulk and
function that could be involved in the pathophysiology of heart failure.
METHODS: Seventy elderly patients with stable CHF-median age 70 years, ejection fraction 31.8 +/- 7%-were randomly assigned
to receive testosterone (n = 35, intramuscular injection every 6 weeks) or placebo (n = 35), both on top of optimal medical therapy.
At baseline and at the end of the study, all patients underwent echocardiogram, cardiopulmonary exercise test, 6-min walk test
(6MWT), quadriceps maximal voluntary contraction (MVC), and isokinetic strength (peak torque) and BRS assessment
(sequences technique).
RESULTS: Baseline peak oxygen consumption (VO(2)) and quadriceps isometric strength showed a direct relation with serum
testosterone concentration. Peak VO(2) significantly improved in testosterone but was unchanged in placebo. Insulin sensitivity
was significantly improved in testosterone. The MVC and peak torque significantly increased in testosterone but not in placebo.
The BRS significantly improved in testosterone but not in placebo. Increase in testosterone levels was significantly related to
improvement in peak VO(2) and MVC. There were no significant changes in left ventricular function either in testosterone or placebo.
CONCLUSIONS: These results suggest that long-acting testosterone therapy improves exercise capacity, muscle strength,
glucose metabolism, and BRS in men with moderately severe CHF. Testosterone benefits seem to be mediated by metabolic
and peripheral effects.
PMID: 19712802 [PubMed - indexed for MEDLINE]
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