Journal
JOURNAL OF PHYSIOLOGY-LONDON
Volume 590, Issue 15, Pages 3575-3583Publisher
WILEY
DOI: 10.1113/jphysiol.2012.232777
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Funding
- Swedish Research Council
- Swedish National Center for Sports Research
- Association Francaise Contre les Myopathies (AFM)
- National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS) [1F32AR057619]
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Dietary inorganic nitrate has profound effects on health and physiological responses to exercise. Here, we examined if nitrate, in doses readily achievable via a normal diet, could improve Ca2+ handling and contractile function using fast- and slow-twitch skeletal muscles from C57bl/6 male mice given 1 mm sodium nitrate in water for 7 days. Age matched controls were provided water without added nitrate. In fast-twitch muscle fibres dissected from nitrate treated mice, myoplasmic free [Ca2+] was significantly greater than in Control fibres at stimulation frequencies from 20 to 150 Hz, which resulted in a major increase in contractile force at =50 Hz. At 100 Hz stimulation, the rate of force development was 35% faster in the nitrate group. These changes in nitrate treated mice were accompanied by increased expression of the Ca2+ handling proteins calsequestrin 1 and the dihydropyridine receptor. No changes in force or calsequestrin 1 and dihydropyridine receptor expression were measured in slow-twitch muscles. In conclusion, these results show a striking effect of nitrate supplementation on intracellular Ca2+ handling in fast-twitch muscle resulting in increased force production. A new mechanism is revealed by which nitrate can exert effects on muscle function with applications to performance and a potential therapeutic role in conditions with muscle weakness.
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