Solved at last – why spinach makes us strong.

24 Jul

I normally try and rewrite press releases and put a couple of jokes in.

This looks good enough to reproduce as is

[PRESS RELEASE 25 June 2012] Nitrate, which is found naturally in spinach and other vegetables, has a powerful effect on muscle strength. Scientists at Karolinska Institutet have now uncovered how this happens by identifying two relevant proteins, the production of which is stimulated by the intake of nitrate. The study found that mice supplied with nitrate in their drinking water developed significantly stronger muscles – and this at doses obtainable from a normal diet.

The researchers divided the mice into two groups, one which was given nitrate in their drinking water for seven days and a control. While spinach and beetroot are two of the main sources of nitrate, it also occurs naturally in many other leafy vegetables, such as lettuce and chard. The quantity of nitrate that the mice received was roughly equivalent to that which a person would obtain by eating 200 to 300 grams of fresh spinach or two to three beetroots a day.

A week into the experiment the team examined different muscles on the mice’s legs and feet. They found that the mice that had been on consistent nitrate had much stronger muscles, the greatest effect being observed in the extensor digitorum longus muscle, which extends down the tibia, and the flexor digitorum brevis muscle of the foot.


Continuing their study, the researchers then discovered that the nitrate mice had a higher concentration of two different proteins in their muscles, which is assumed to explain the greater muscle strength. These two proteins, CASQ1 and DHPR, are involved in the homeostasis of calcium, a critical determinant of muscle contraction.


The teams now want to take their discoveries further and study how they can be applied to people with muscle weakness.


“From a nutritional perspective our study is interesting because the amount of nitrate that affected muscle strength in mice was relatively low,” says Dr Andrés Hernández, researcher at the Department of Physiology and Pharmacology. “Translated to humans it means that we can obtain the equivalent volume by eating more of a vegetarian diet, as nitrate is found naturally in several leafy vegetables, especially in beetroot juice, for example. There are currently no dietary supplements containing nitrate.”


The study was financed by the Swedish Research Council, the Swedish National Centre for Research in Sports, Association française contre les myopathies, AFM (French Association against Myopathies) and the National Institute for Arthritis and Musculoskeletal and Skin Diseases (NIAMS).


Andrés Hernández, Tomas A. Schiffer, Niklas Ivarsson, Arthur J. Cheng, Joseph D. Bruton, Jon O. Lundberg, Eddie Weitzberg, Håkan Westerblad

Dietary nitrate increases tetanic [Ca2+]i and contractile force in mouse fast-twitch muscle

Journal of Physiology, Epub ahead of print 11 June 2012, doi:10.1113/jphysiol.2012.232777

3 thoughts on “Solved at last – why spinach makes us strong.

  1. Interesting Andrew, didnt realise there was a strength benefit. Awesome.

    It’s even more useful for runners and endurance athletes. Nitrate makes you use oxygen more efficiently;ie you can work more intensely for the same oxygen use.

    Presumably it doesnt work if you use organic veg? Because no nitrate fertiliser is used? Also preume you have to chew it not swallow it?

  2. the nitrate is naturally occuring in things like beetroot and spinch. also makes them good to lower blood pressure ( nitrates are used in some heart medication)

    Hence general recommendations to eat vegetables ( and meat/nuts and seeds). God put all the stuff we need in food. In between the floods and pestilence, God does have her positive days

  3. interestingly the effects are limited

    “Dietary nitrate improves muscle but not cerebral oxygenation status during exercise in hypoxia”
    Evi Masschelein1, Ruud Van Thienen1, Xu Wang2, Ann Van Schepdael2,Martine Thomis1, and Peter Hespel1

    Short-term dietary nitrate supplementation improves arterial and muscle oxygenation status but not cerebral oxygenation status during exercise in severe hypoxia. This is associated with improved exercise tolerance against the background of a similar incidence of AMS.

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