Disparate Associations of Years of Football Participation and a Metric of Head Impact Exposure with Neurobehavioral Outcomes in Former Collegiate Football Players

Objectives: Years of sport participation (YoP) is conventionally used to estimate cumulative repetitive head impacts (RHI) experienced by contact sport athletes. The relationship of this measure to other estimates of head impact exposure and the potential associations of these measures with neurobehavioral functioning are unknown. We investigated the association between YoP and the Head Impact Exposure Estimate (HIEE), and whether associations between the two estimates of exposure and neurobehavioral functioning varied. Methods: Former American football players (N = 58; age = 37.9 ± 1.5 years) completed in-person evaluations approximately 15 years following sport discontinuation. Assessments consisted of neuropsychological assessment and structured interviews of head impact history (i.e., HIEE). General linear models were fit to test the association between YoP and the HIEE, and their associations with neurobehavioral outcomes. Results: YoP was weakly correlated with the HIEE, p = .005, R 2 = .13. Higher YoP was associated with worse performance on the Symbol Digit Modalities Test, p = .004, R 2 = .14, and Trail Making Test-B, p = .001, R 2 = .18. The HIEE was associated with worse performance on the Delayed Recall trial of the Hopkins Verbal Learning Test-Revised, p = .020, R 2 = .09, self-reported cognitive difficulties (Neuro-QoL Cognitive Function), p = .011, R 2 = .10, psychological distress (Brief Symptom Inventory-18), p = .018, R 2 = .10, and behavioral regulation (Behavior Rating Inventory of Executive Function for Adults), p = .017, R 2 = .10. Conclusions: YoP was marginally associated with the HIEE, a comprehensive estimate of head impacts sustained over a career. Associations between each exposure estimate and neurobehavioral functioning outcomes differed. Findings have meaningful implications for efforts to accurately quantify the risk of adverse long-term neurobehavioral outcomes potentially associated with RHI.

Occupational Exposure Estimate of Benzene and the Effectiveness of Control Measure in Gabon’s Gasoline Storage and Distribution Facility

The processing of petroleum products in gasoline storage and distribution facility for loading operation, has caused the generation of vapor emissions sources. Benzene is one of those vapor emissions that workers are likely to be exposed at high exposure level during conducting out specific tasks such as loading gasoline to various petroleum storage transport modes. This results in many problems on human health such as cancer and non-cancer diseases. However, the estimate of benzene exposure to indicate the control measures has not been fully explored in previous researches. In this study, the occupational exposure estimate of benzene in Gabon’s gasoline storage and distribution facility was investigated by using a quantitative and predictive exposure inhalation model; to estimate benzene concentration before and after applying control measures. The results indicate that the benzene concentrations varied between 9.46 mg/m³ and 187 mg/m³ for short term and has the value of 187 mg/m³ for long term. The implementation of control measures including using vapor recovery system, chemical filter mask and improving worker’s behavior might contribute to significantly reduce benzene concentration to the range of 4.52 – 29.08 mg/m³ for short term and down to 4.55 mg/m³ for long term. This almost meets the Agency Governmental Industrial Hygienists standard, in which occupational exposure limit for short term and long term exposure is 8.1 mg/m³ and 3.16 mg/m³, respectively.

Mycotoxins in Tea: Occurrence, Methods of Determination and Risk Evaluation

Tea is one of the most popular beverages all over the world. Being an everyday drink for almost everyone, for centuries tea was considered safe and healthy. However, fungal contamination of tea at any stage of commodity production can pose a serious health hazard due to the accumulation of toxic secondary metabolites of moulds. Contemporary research revealed incidences of highly contaminated samples. Mycotoxin transfer from naturally contaminated raw tea into beverage was well studied for ochratoxin A only, and the possible leak of other mycotoxins is discussed. The results of several surveys were combined to evaluate aflatoxin B1 and ochratoxin A contamination levels in black tea and Pu-erh. Exposure estimate to aflatoxin B1 and ochratoxin A due to tea consumption was carried out based on these data. Average contamination level corresponds to the exposure of 3–40% (aflatoxin B1) and 5–24% (ochratoxin A) of mean overall estimates for different cluster diets. Lack of data does not allow the conclusion for the necessity of public health protection measures. It is necessary to perform representative studies of different kinds of tea for regulated mycotoxins at least. Contemporary techniques for analysis of mycotoxins in tea are summarised in the present review.