What role does TSH Schilddrüse play in Sport?

TSH (thyroid-stimulating hormone) is a key regulator of thyroid function and thus of overall energy metabolism. In sports, an optimal TSH level indirectly influences performance because thyroid hormones (T3/T4) control basal metabolic rate, heart rate, muscle contraction, and recovery. Low TSH (hyperthyroidism) can cause elevated heart rate, tremor, and muscle wasting – detrimental for both endurance and strength sports. High TSH (hypothyroidism) slows metabolism, leading to fatigue, lack of energy, and delayed recovery. However, the evidence for a direct TSH–sport interaction is mostly mechanistic and observational. No robust studies show that a single TSH value predicts athletic performance. TSH alone is not a sport biomarker; clinical assessment requires T3, T4, and symptoms. If TSH is abnormal, consult a physician before adjusting training. The MyBody-X test provides a non-medical indication of possible metabolic traits, not a diagnosis.