Malaria incidence is increasing, accounting for an estimated 300 to 500 million cases and 3 million deaths annually. In the Americas, malaria incidence has risen dramatically, with as much as a 400% increase in reported cases in the last 20 years. At least 30,000 travelers from industrialized countries are reported to contract malaria each year, and despite treatment between 1% and 4% of those who acquire Plasmodium falciparum malaria will die. This fatality rate can climb to 20% or higher in those patients who develop severe malaria or those who are elderly.
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The use of dumbbells gives you a much more comprehensive strengthening effect because the workout engages your stabilizer muscles, in addition to the muscle you may be pin-pointing. Without all of the belts and artificial stabilizers of a machine, you also engage your core muscles, which are your body's natural stabilizers.