Walking and biologic ageing: Evidence based on NHANES telomere data

ABSTRACT

The length of telomeres is an objective measure of biologic ageing. This study evaluated the extent minutes of walking per week are associated with leukocyte telomere length (LTL) in a random sample of 5,823 U.S. adults. The investigation was cross-sectional and data were obtained from the National Health and Nutrition Examination Survey (NHANES). LTL was measured by the quantitative polymerase chain reaction method. Walking minutes was calculated from walking frequency and duration measures. Results showed that for each year of chronological age, telomeres were 15.6 base pairs shorter (P < 0.0001). With walking minutes and LTL treated as continuous variables, the relationship was quadratic, not linear (F = 11.2, P = 0.0023). With walking time divided into three categories, adults who performed ≥ 150 minutes of walking per week had longer telomeres than those who did no regular walking, and those who did some, but less than the recommendation (F = 5.0, P = 0.0137). Regular walkers were estimated to have a biologic ageing advantage associated with 6.5–7.6 years less biologic ageing compared to non-walkers, after adjusting for covariates. Additional investigations designed to study causality and the mechanisms associated with the walking and LTL relationship are needed.     

Disciplinary containment: whiteness and the academic scarcity narrative

ABSTRACT

Amid rising controversy around the alleged distinctions between merit and excellence lies a familiar refrain, scarcity. The narrative of academic scarcity, proclaiming the insufficient numbers of scholars and academics of color, permeates conversations in higher education. We suggest that the academic scarcity narrative, a remnant of stagnant logics of diversity, circulates as a contemporary mechanism of what we name disciplinary containment. Extending disciplinary conversations around rhetorical containment, we argue that disciplinary containment perpetuates whiteness.     

Response and Responsibility: Rethinking Accountability in Education

Current conceptions of accountability imply that, in order for teachers to be able to hold themselves to account, they need first to have cultivated certain ‘professional dispositions’. But these conceptions fail to acknowledge the extent to which teachers are first and foremost accountable ‘as such’. For the early existentialist thought of the philosopher Jean‐Paul Sartre, this relates to a kind of responsibility premised on the ways in which we are always and inevitably responding to the world in which we find ourselves (with others). In this paper, I offer a reconceptualisation of teacher accountability in light of this, one that recognises implicit responses in classroom situations as underpinned by the subjectivity of those who bring these situations to light—often in subtle and immeasurable ways.