Oxidative stress associated with rapid weight reduction decreases circulating adiponectin concentrations

Area of Science:

• Sports Medicine
• Endocrinology
• Exercise Physiology

Background:

• The impact of acute weight reduction on adipocytokine production remains unclear.
• Athletes often undergo rapid weight loss for competition, potentially inducing physiological stress.

Purpose of the Study:

• To investigate changes in adipocytokines and stress markers during acute weight reduction in male collegiate wrestlers.
• To explore the relationship between stress, adipocytokines, and testosterone during weight cutting.

Main Methods:

• Studied 20 Japanese male collegiate wrestlers during preparation for a national tournament.
• Measured body weight, body fat, serum testosterone, leptin, adiponectin, and urinary 8-hydroxy-2'-deoxyguanosine (8-OHdG) and biopyrrins.

Main Results:

• Significant decreases in body weight, body fat, testosterone, leptin, and adiponectin were observed by weigh-in day.
• Urinary concentrations of stress markers (8-OHdG and biopyrrins) significantly increased by weigh-in day.
• Positive correlation between adiponectin and testosterone; negative correlation between adiponectin and urinary biopyrrins.

Conclusions:

• Rapid weight reduction in wrestlers elevates physiological stress markers.
• Decreased serum adiponectin concentrations are associated with increased stress during acute weight loss.
• Findings suggest potential adverse endocrine and metabolic effects of severe weight cutting in athletes.