There is, of course, no reason why asthma and exercise-induced bronchoconstriction should not co-exist but the distinction is important because without successful treatment of underlying asthma, treatment of an exercise component will likely be unsuccessful. If baseline testing is normal, some form of exercise or pharmacologic stress will be required, either on the sideline or practice venue, or in the laboratory. Exercise testing
Treadmill or ergometer-based testing in lung function laboratories are effective methods for diagnosing exercise-induced bronchoconstriction, but may result in false negatives if the exercise stimulus is not intense enough. Field-exercise challenge
Field-exercise challenge tests that involve the athlete performing the sport in which they are normally involved and assessing FEV1 after exercise are helpful if abnormal but have been shown to be less sensitive than eucapnic voluntary hyperventilation. Eucapnic voluntary hyperventilation challenge
The International Olympic Committee recommends the eucapnic voluntary hyperventilation (EVH) challenge as the test to document exercise-induced asthma  in Olympic athletes. In the EVH challenge, the patient voluntarily, without exercising, rapidly breathes dry air enriched with 5% CO2 for six minutes. The presence of the enriched CO2 compensates for the CO2 losses in the expired air, not matched by metabolic production, that occurs during hyperventilation, and so maintains CO2 levels at normal. Medication challenge
Medication challenge tests, such as the methacholine challenge test, have a lower sensitivity for detection of exercise-induced bronchoconstriction in athletes and are also not a recommended first-line approach in the evaluation of exercise-induced asthma.Mannitol inhalation has been recently approved for use in the United States.
Black hairy tongue  syndrome (BHT) is a condition of the tongue in which the small bumps on the tongue elongate with black or brown discoloration, giving a black and hairy appearance. The appearance may be alarming, but it is a harmless condition. Predisposing factors include smoking, xerostomia (dry mouth), soft diet, poor oral hygiene and certain medications. Management is facilitated by improving oral hygiene, especially scraping or brushing the tongue. Signs and symptoms
Hairy tongue largely occurs in the central part of the dorsal tongue, just anterior (in front) of the circumvallate papillae, although sometimes the entire dorsal surface may be involved. Discoloration usually accompanies hairy tongue, and may be yellow, brown or black. Apart from the appearance, the condition is typically asymptomatic, but sometimes people may experience a gagging sensation or a bad taste. There may also be associated oral malodor (intra-oral halitosis).The term "melanoglossia is also used to refer to there being black discolorations on the tongue without "hairs", which are also harmless and unrelated to black hairy tongue. Causes
The cause is uncertain, but it is thought to be caused by accumulation of epithelial squames and proliferation of chromogenic (i.e., color-producing) microorganisms. There may be an increase in keratin production or a decrease in normal desquamation (shedding of surface epithelial cells). Many people with BHT are heavy smokers. Other possible associated factors are poor oral hygiene, general debilitation, hyposalivation (i.e., decreased salivary flow rate), radiotherapy, overgrowth of fungal or bacterial organisms, and a soft diet.