Skin advanced glycation end-product accumulation is negatively associated with calcaneal osteo-sono assessment index among non-diabetic adult Japanese men

This study aims to determine the relationship between advanced glycation end-product (AGE) accumulation in skin tissue and bone strength, assessed by quantitative ultrasound, among healthy adult Japanese men. The results of the study suggest that men with higher AGE accumulation in skin tissue have a lower osteo-sono assessment index.

INTRODUCTION

AGE accumulate in bone collagen with age and diabetes and decrease the mechanical properties of bone. Although increased AGE levels are associated with fractures among diabetic patients and elderly women, it is unclear whether a relationship between increased AGE levels and bone strength is present in apparently healthy adult males. The aim of this study was to determine the relationship between AGE accumulation in tissue and the mechanical properties of bone among adult Japanese men, using quantitative ultrasound as a surrogate measure of the latter.

METHODS

Skin autofluorescence (AF), which is a noninvasive method for measuring tissue AGEs, and osteo-sono assessment index (OSI), which is determined by quantitative ultrasound, were measured in 193 adult Japanese men (median age 43 years; interquartile range 37.0-55.0 years).

RESULTS

Adjusted for age, BMI, calcium intake, physical activity, smoking status, and education level, log-transformed skin AF had a negative association with log-transformed OSI (β = -0.218, P < 0.01). Adjusted geometric means (95% CI) for OSI across the tertiles of skin AF were 2.81 (2.75-2.87) for the lowest tertile, 2.81 (2.74-2.87) for the middle tertile, and 2.66 (2.61-2.73) for the highest tertile; thus, OSI for the highest skin AF appeared to be 5.0% lower than that for the lowest and middle skin AF tertiles (P < 0.01).

CONCLUSION

Among apparently healthy adult Japanese men, those with higher skin AF had a lower OSI, indicating a relationship between AGE accumulation and bone strength. A long-term prospective study is required to clarify the causality.

Effects of a two-week, hospitalized phase II cardiac rehabilitation program on physical capacity, lipid profiles and psychological variables in patients with acute myocardial infarction

A new 2-week hospitalized phase II cardiac rehabilitation program has been designed and the present study sought to clarify whether the physical and psychological status of patients with acute myocardial infarction (AMI) improved after participation in the program. Fifty-one patients with AMI were enrolled in the rehabilitation program, which consisted of exercise training, education and counselling, and another 34 patients with AMI who did not participate in the program served as the control group. The physical and psychological status of the patients was evaluated before, at 1-month after the program, and at 6- and 12-months follow-ups. The physical status was assessed by exercise tolerance and serum lipid profiles and the psychological status was assessed by the Spielberger State-Trait anxiety inventory questionnaire (STAI) and self-rating questionnaire for depression. Quality of life (QOL) was assessed using established and validated QOL scales. After participation in the program, the exercise tolerance, serum lipid profiles and STAI anxiety score of the patients were improved significantly and at the 6-month follow-up these parameters remained improved and regular physical activity was maintained. The QOL score also improved significantly. Even at the 12-month follow-up, lipid profiles remained improved and regular physical activity was maintained. The 2-week hospitalized phase II cardiac rehabilitation program improved the management of cardiac risk factors and psychological status in patients with myocardial infarction (MI). It provides beneficial effects on the patient's physical and psychological activities in the recovery phase and may also contribute to the secondary prevention of MI.