Publications

BACKGROUND AND OBJECTIVES

Walking speed is an important measure of physical performance that is predictive of disability and mortality. The relationship of dietary factors to changes in physical performance has not been well characterized in older adults. The aim was to determine whether total serum carotenoid concentrations, a marker for fruit and vegetable intake, and serum selenium are related to changes in walking speed in older women.

SUBJECTS AND METHODS

The relationship between total serum carotenoids and selenium measured at baseline, 12, and 24 months follow-up and walking speed assessed at baseline and every six months for 36 months was examined in 687 moderately to severely disabled women, 65 years or older, living in the community.

RESULTS

Mean total serum carotenoids were associated with mean walking speed over three years of follow-up (P = 0.0003) and rate of change of walking speed (P = 0.007) in multivariate linear regression models adjusting for age, body mass index, and chronic diseases. Mean serum selenium was associated with mean walking speed over three years of follow-up (P = 0.0003) but not with the rate of change of walking speed (P = 0.26).

CONCLUSIONS

These findings suggest that a higher fruit and vegetable intake, as indicated by higher total serum carotenoid concentrations, may be protective against a decline in walking speed in older women.

Gonorrhea remains an important clinical and public health problem throughout the world. Gonococcal infections have historically been diagnosed by Gram stain and culture but are increasingly diagnosed through nucleic acid tests, thereby eliminating the opportunity for antimicrobial susceptibility testing. Gonococcal infections are typically treated with single-dose therapy with an agent found to cure > 95% of cases. Unfortunately, the gonococcus has repeatedly developed resistance to antimicrobials including sulfonamides, penicillin, tetracyclines and fluoroquinolones. This has now left third-generation cephalosporins as the lone class of antimicrobials recommended as first-line therapy for gonorrhea in some regions. However, resistance to oral third-generation cephalosporins has emerged and spread in Asia, Australia and elsewhere. The mechanism of this resistance seems to be associated with a mosaic penicillin binding protein (penA) in addition to other chromosomal mutations previously found to confer resistance to beta-lactam antimicrobials (ponA, mtrR, penB, pilQ). Few good options exist or are in development for treating cephalosporin-resistant isolates, as most have had multidrug resistance. Preventing the spread of resistant isolates will depend on ambitious antimicrobial management programs, strengthening and expanding surveillance networks, and through effective sexually transmitted disease control and prevention.

OBJECTIVE

To determine whether greater frequency and severity of hot flashes are independently associated with insomnia symptoms and objective measures of disrupted sleep among healthy postmenopausal women with hot flashes.

METHODS

A baseline cross-sectional analysis of a multicenter, randomized trial in 217 healthy postmenopausal women aged 40 to 60 years with hot flashes was conducted. Hot flash frequency and severity were recorded in a daily diary; frequency of moderate to severe hot flashes was the primary measure. Insomnia symptoms were assessed with the Insomnia Severity Index (ISI). Hot flash frequency and severity and objective parameters of sleep-wake patterns (using a wrist actigraph) were concurrently measured over an average of seven consecutive 24-hour periods in a subcohort of 112 women.

RESULTS

The mean age of participants was 54 years, and 80% were white; 33% had an ISI score greater than 14, consistent with at least moderate insomnia. In multivariable analysis, the mean ISI score showed a stepwise increase in magnitude with higher frequency of moderate to severe hot flashes (adjusted mean ISI score, 9.5, 11.4, 11.9, and 13.0 for quartiles 1-4, respectively; P for trend = 0.002). Higher frequency of moderate to severe hot flashes was also independently associated in a graded manner with greater nighttime wakefulness (P for trend = 0.028) and a higher number of long wake episodes (P for trend = 0.008) but was not related to sleep efficiency, total sleep time, or sleep latency.

CONCLUSIONS

Among healthy postmenopausal women with hot flashes, frequency of moderate to severe hot flashes was independently associated in a graded manner with severity of insomnia symptoms and objective measures of nighttime wakefulness and sleep fragmentation.

Activation of sphingosine kinase/sphingosine 1-phosphate-mediated signaling has emerged as a critical cardioprotective pathway in response to acute ischemia/reperfusion injury. Application of exogenous sphingosine 1-phosphate (S1P) in cultured cardiac myocytes subjected to hypoxia or treatment of isolated hearts either before ischemia or at the onset of reperfusion (pharmacologic preconditioning or postconditioning) exerts prosurvival effects. Synthetic congeners of S1P mimic these responses. Gene-targeted mice null for the sphingosine kinase 1 isoform whose hearts are subjected to ischemia/reperfusion injury exhibit increased infarct size and respond poorly either to ischemic preconditioning or to ischemic postconditioning. Measurements of cardiac sphingosine kinase activity and S1P parallel these observations. High-density lipoprotein is a major carrier of S1P, and studies of hearts in which selected S1P receptors have been deleted implicate the S1P cargo of high-density lipoprotein in cardioprotection. These observations have considerable relevance for future therapeutic approaches to acute and chronic myocardial injury.