Hematocrits of triathletes: Is monitoring useful?

Article Abstract:

Safety cutoffs for hematocrit levels in triathletes have been investigated. Background data for future medical control regulations has been developed. Mean race day changes were small but statistically significant for Olympic and Ironman men and for half-Ironman women. Hematocrit changes ranged for -7.1 to +10%. Cutoff values of 48% for women and 52% for men are suggested by the data. The relationship of the cutoffs to ability to detect rules violations and to athlete safety is not known.

United States, Safety and security measures, Measurement, Endurance sports, Athletes, Erythropoietin, Drugs and athletes, Hematocrit

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Effects of cycling alone or in a sheltered position on subsequent running performance during a triathlon

Article Abstract:

Cyclist competitors may benefit from drafting, which means riding in a group formation, during a triathlon. Subsequent running performance improved in eight triathletes, especially in strong runners, after having optimized their bike performance via drafting. Physiological markers, such as lower heart rate, ventilation values, and energy expenditure confirmed these findings during the bicycle portion of the triathlon. In contrast, riding alone will not conserve energy as well as drafting.

Methods, Competitions, Bicycle racing, Running races

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Calcium losses resulting from an acute bout of moderate-intensity exercise

Article Abstract:

Those engaged in moderate exercise and living in a warm, humid climate need not increase their intake of calcium, according to tests. Tests indicate that a small amount of calcium is lost in sweat during moderate-intensity exercise, but the combined calcium losses in sweat and uring are not different on exercise and non-exercise days.

Analysis, Perspiration, Calcium metabolism, Electrolytes

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