Search Results - "JOHNS, JARRETT A."

Impact of High-Intensity Interval Training, Moderate-Intensity Continuous Training, and Resistance Training on Endothelial Function in Older Adults by O’BRIEN, MYLES W., JOHNS, JARRETT A., ROBINSON, SUSAN A., BUNGAY, AMANDA, MEKARY, SAID, KIMMERLY, DEREK S.

“…PURPOSEIt is unclear if high-intensity interval training (HIIT) elicits superior improvements in brachial artery (BA) flow-mediated dilation (FMD) responses…”
Get full text

The influence of habitual breaks in sedentary time on cardiovagal baroreflex function by O'Brien, Myles W, Al-Hinnawi, Amera, Wu, Yanlin, Petterson, Jennifer L, Shivgulam, Madeline E, Johns, Jarrett A, Frayne, Ryan J, Kimmerly, Derek S

“…Sedentary time has recently been included in the 24-h activity guidelines. However, the impact of habitual sedentary patterns on autonomic cardiovascular…”
Get more information

Sex does not influence impairments in popliteal endothelial-dependent vasodilator or vasoconstrictor responses following prolonged sitting by O'Brien, Myles W, Johns, Jarrett A, Williams, Tanner D, Kimmerly, Derek S

“…An acute bout of prolonged sitting (PS) impairs the popliteal artery flow-mediated dilation (FMD) response. Despite equivocal reductions in mean shear rate,…”
Get full text

Popliteal flow-mediated dilatory responses to an acute bout of prolonged sitting between earlier and later phases of natural menstrual and oral contraceptive pill cycles by O'Brien, Myles W, Johns, Jarrett A, Al-Hinnawi, Amera, Kimmerly, Derek S

“…Uninterrupted sitting can impair popliteal flow-mediated dilation (FMD) responses in young, premenopausal females when endogenous or exogenous estrogen levels…”
Get full text

Improving the criterion validity of the activPAL in determining physical activity intensity during laboratory and free-living conditions by Wu, Yanlin, Johns, Jarrett A., Poitras, Justine, Kimmerly, Derek S., O'Brien, Myles W.

“…The activPAL is a valid measure of step counts and posture, but its ability to determine physical activity intensity is unclear. This study tested the…”
Get full text

The impact of age and sex on popliteal artery endothelial-dependent vasodilator and vasoconstrictor function by O'Brien, Myles W., Johns, Jarrett A., Petterson, Jennifer L., Mekary, Said, Kimmerly, Derek S.

“…Lower-limb arteries, such as the popliteal artery, are a common site of atherosclerosis. These arteries are habitually exposed to large fluctuations in blood…”
Get full text

Development and validation of an activPAL accelerometry count-based model of physical activity intensity in adults by O'Brien, Myles W., Wu, Yanlin, Johns, Jarrett A., Poitras, Justine, Kimmerly, Derek S.

“…•The activPALs default method poorly predicts physical activity intensity.•We use the activPALs accelerometry output to develop a counts-intensity model.•This…”
Get full text

Comparison of habitual stepping cadence analysis methods: Relationship with step counts by O'Brien, Myles W., Johns, Jarrett A., Frayne, Ryan J., Kimmerly, Derek S.

“…Different approaches have been implemented to calculate stepping cadence (steps/min) that vary in the time demominator used. Given the differences in how…”
Get full text

Influence of prostaglandins and endothelial-derived hyperpolarizing factors on brachial and popliteal endothelial-dependent function in young adults by Petterson, Jennifer L, O'Brien, Myles W, Johns, Jarrett A, Chiasson, Jack, Kimmerly, Derek S

“…Heterogeneous flow-mediated dilation (FMD) and low-flow-mediated constriction (L-FMC) responses have been reported between upper- and lower-limb arteries…”
Get full text

Does aerobic fitness impact prolonged sitting-induced popliteal artery endothelial dysfunction? by Liu, Haoxuan, O’Brien, Myles W., Johns, Jarrett A., Kimmerly, Derek S.

“…Purpose Acute prolonged bouts of sitting reduce popliteal artery blood flow and flow-mediated dilation (FMD). Individuals with higher aerobic fitness have…”
Get full text

The impact of different step rate threshold methods on physical activity intensity in older adults by O’Brien, Myles W., Petterson, Jennifer L., Johns, Jarrett A., Mekary, Said, Kimmerly, Derek S.

“…Older adults benefit most from engaging in higher-intensity physical activity, which is often determined using step rate thresholds. Fixed step rate thresholds…”
Get full text

Relationship between brachial and popliteal artery low-flow-mediated constriction in older adults: impact of aerobic fitness on vascular endothelial function by O'Brien, Myles W, Johns, Jarrett A, Robinson, Susan A, Mekary, Said, Kimmerly, Derek S

“…We previously observed that brachial artery (BA) low-flow-mediated constriction (L-FMC) is inversely related to aerobic fitness (i.e., V̇o ) in older adults…”
Get full text

Foam rolling improvements in passive hip flexion last up to 60-minutes in ice hockey players by Johns, Jarrett A., Moreside, Janice M.

“…Ice hockey players often lack hip mobility which may be attributed to excessive time spent in a flexed position during competition and the intensive use of hip…”
Get full text

A larger low‐flow‐mediated constrictor response is associated with augmented flow‐mediated dilation in the popliteal artery by O'Brien, Myles W., Petterson, Jennifer L., Johns, Jarrett A., Mekary, Said, Kimmerly, Derek S.

“…In the brachial artery, conflicting evidence exists regarding the relationship between the low‐flow–mediated constriction (L‐FMC) and subsequent flow‐mediated…”
Get full text

The relationship between aerobic fitness and low-flow-mediated constriction in older adults by O’Brien, Myles W., Mekary, Said, Robinson, Susan A., Johns, Jarrett A., Kimmerly, Derek Stephen

“…Purpose Aerobic fitness is directly related to favorable vasodilatory (i.e., flow-mediated dilation; FMD) and vasoconstrictor functions (i.e.,…”
Get full text

Substituting Stationary Time With Moderate-Intensity Activity May Improve Flow-Mediated Dilation by O'Brien, Myles W., Shivgulam, Madeline E., Petterson, Jennifer L., Wu, Yanlin, Johns, Jarrett A., Frayne, Ryan J., Kimmerly, Derek S.

Get full text

Impact of habitual sedentary patterns on popliteal artery endothelial-dependent vasodilation in healthy adults by Shivgulam, Madeline E, O’Brien, Myles W, Johns, Jarrett A, Petterson, Jennifer L, Wu, Yanlin, Frayne, Ryan J, Kimmerly, Derek S

“…Introduction: Acute, laboratory-based bouts of prolonged sitting attenuate lower-limb arterial endothelial-dependent vasodilation. However, the impact of…”
Get full text

The Bout Cadence Method Improves the Quantification of Stepping Cadence In Free-Living Conditions by Johns, Jarrett A., Frayne, Ryan J., Goreham, Joshua A., Kimmerly, Derek S., O’Brien, Myles W.

“…•Stepping cadence provides important information about activity intensity patterns.•Previous analytical approaches may incorrectly characterize stepping…”
Get full text

Spontaneous cardiovagal baroreflex sensitivity is unaffected by an acute bout of prolonged sitting: no impact of sex, menstrual phase, or oral contraceptive pill phase by O’Brien, Myles W., Al-Hinnawi, Amera, Johns, Jarrett A., Kimmerly, Derek S.

Get full text

Validity of the activPAL and Height-Adjusted Curvilinear Cadence-METs Equations in Healthy Adults by O'Brien, Myles W., Johns, Jarrett A., Fowles, Jonathon R., Kimmerly, Derek S.

“…The activPAL is a widely-used measure of sedentary time but few studies have evaluated its ability to estimate physical activity intensity. This study…”
Get full text