The association of zero walking cadence minutes with sleep quality in adults 18-65.

Purpose: Physical activity (PA) guidelines suggest a link between PA, sedentary time, and sleep quality (SQ). Step cadence is an emerging proxy for PA intensity, with zero cadence (ZC) indicating sedentary time. No research has explored the relationship between ZC and SQ.

The influence of the CYP1A2-163 C>A polymorphism on the hemostatic response to exercise following caffeine supplementation.

Background: Prior work from our group suggests that caffeine increases thrombotic potential after acute exercise. The aim of this study was to determine if hemostatic responses to exercise affected by caffeine are influenced by the CYP1A2-163 C>A polymorphism.

Methods: Forty-two healthy men performed two trials in which a graded maximal exercise test was completed one hour after consuming either 6 mg/kg of caffeine or placebo.

Increased sedentary time and decreased physical activity increases lipoprotein associated phospholipase A in obese individuals.

Background And Aims: Lipoprotein-associated Phospholipase A (Lp-PLA) is a protein produced by inflammatory cells in circulation and is associated with cardiovascular disease (CVD) risk. Physical activity (PA) is known to reduce inflammation and risk for CVD. However, Lp-PLA has yet to be examined in relation to PA and sedentary time.

Reliability of the heart rate variability threshold during treadmill exercise.

The heart rate variability threshold (HRVT) is a clinical parameter used to gain insight into autonomic balance. Prior validation of the HRVT has been with cycle ergometry, with no studies examining the viability of treadmill exercise. The purpose of this study was to examine the reliability of the HRVT during treadmill exercise, and to compare the HRVT to the ventilatory threshold (VT).

Physiological differences in cardiovascular hemodynamics across treadmill and cycle exercise as assessed through impedance cardiography.

Impedance cardiography (IC) is a non-invasive method for assessing cardiovascular hemodynamics, and has been utilised during exercise, exclusively on a cycle ergometer. Mode-specific differences in cardiovascular hemodynamics during exercise have previously been identified, but the ability of IC to identify these differences has not been explored. Therefore, we examined the repeatability of cardiovascular hemodynamics within and between exercise modes on the treadmill (TM) and cycle (CY) ergometer.

The impact of the COVID-19 pandemic on physical activity habits at a residential university.

Objective: To assess changes in physical activity (PA) after a COVID-19 shutdown on a primarily residential university campus.

Methods: Eighty students, faculty, and staff (FS) of a university (age: 32.2 ± 13.

Combining supervised run interval training or moderate-intensity continuous training with the diabetes prevention program on clinical outcomes.

Purpose: The present study was designed to evaluate the 16 weeks diabetes prevention program (DPP) combined with instructed run sprint interval training (INT) or moderate-intensity continuous training (MICT) on glycemic control, body composition, fitness, exercise adherence, and perceived exercise enjoyment in sedentary, adults with prediabetes.

Methods: Participants completed three weekly supervised sessions of INT (4-10 bouts of 30 s maximal sprints followed by a 4 min active recovery) or MICT (30-60 min at 45-55% HRR) exercise coupled with the DPP for 16 weeks. At baseline, 8 and 16 weeks, participants completed fitness and clinical assessments as well as questionnaires to assess group and time differences.

Does obstructive sleep apnea affect exercise capacity and the hemodynamic response to exercise? An individual patient data and aggregate meta-analysis.

Obstructive sleep apnea (OSA) has been linked to altered cardiovascular response to exercise. A systematic review and individual patient data (IPD) meta-analysis were conducted to assess whether OSA patients present reduced exercise capacity. PubMed, Embase and Web of Science were searched until September 2018.

Caffeine Augments the Prothrombotic but Not the Fibrinolytic Response to Exercise.

Unlabelled: Caffeine, a popular ergogenic supplement, induces neural and vascular changes that may influence coagulation and/or fibrinolysis at rest and during exercise.

Purpose: The purpose of this study was to assess the effect of a single dose of caffeine on measures of coagulation and fibrinolysis before and after a single bout of high-intensity exercise.

Methods: Forty-eight men (age, 23 ± 3 yr; body mass index, 24 ± 3 kg·m) completed two trials, with 6 mg·kg of caffeine (CAFF) or placebo (PLAC), in random order, followed by a maximal cycle ergometer test.

Obstructive sleep apnea negatively impacts objectively measured physical activity.

Purpose: Obesity and obstructive sleep apnea (OSA) are frequent comorbid conditions. The impact of OSA on objectively measured physical activity (PA), independent of obesity, is not clear. The purpose of this study is to examine the effect of OSA on PA measured via accelerometer.

One night of sleep restriction following heavy exercise impairs 3-km cycling time-trial performance in the morning.

The goal of this project was to examine the influence of a single night of sleep restriction following heavy exercise on cycling time-trial (TT) performance and skeletal muscle function in the morning. Seven recreational cyclists (age, 24 ± 7 years; peak oxygen consumption, 62 ± 4 mL·kg·min) completed 2 phases, each comprising evening (EX1) and next-morning (EX2) exercise sessions. EX1 and EX2 were separated by an assigned sleep condition: a full night of rest (CON; 7.

The effect of acute aerobic exercise on hemostasis in obstructive sleep apnea.

Purpose: Individuals with obstructive sleep apnea (OSA) have an altered hemostatic balance; however, the exercise response is less described. The purpose of this study is to determine the hemostatic response after acute aerobic exercise in obstructive sleep apnea.

Methods: Eighteen males (nine OSA vs.

Comparison of wrist-worn and hip-worn activity monitors under free living conditions.

Purpose: Current recommendations state that individuals engage in 150 min of moderate or 75 min of vigorous intensity physical activity (PA) each week. Commercial PA monitors are becoming popular for everyday use. The accuracy of these devices, however, is not well understood.

Effects of obstructive sleep apnea on hemodynamic parameters in patients entering cardiac rehabilitation.

Purpose: Obstructive sleep apnea (OSA) is a prevalent form of sleep-disordered breathing. Evidence suggests that OSA may lead to cardiac remodeling, although the literature is equivocal. Previous literature suggests a high percentage of individuals entering a cardiac rehabilitation (CR) program also have OSA.

Lipoprotein-associated phospholipase A2 and carotid intima-media thickness in individuals classified as low-risk according to Framingham.

Background: The Framingham risk score (FRS) has long been used as a global tool to estimate coronary heart disease (CHD) risk, but data has shown that subclinical CHD may exist in those classified as low risk by FRS, and as a result, there is potential for misclassification. Lipoprotein-associated phospholipase A2 (Lp-PLA2) and carotid intima-media thickness (CIMT) are two emerging risk markers that are predictive of future CHD events.

Purpose: To examine Lp-PLA2 and CIMT values in low risk individuals, and to explore the relationship between Lp-PLA2 and CIMT.

Association of Obstructive Sleep Apnea Severity with Exercise Capacity and Health-related Quality of Life.

Background: Current research is inconclusive as to whether obstructive sleep apnea severity directly limits exercise capacity and lowers health-related quality of life (HRQoL).

Aims: The aim of this study was to evaluate the association of obstructive sleep apnea severity with determinants of exercise capacity and HRQoL.

Subjects And Methods: Subjects were evaluated by home somnography and classified as no obstructive sleep apnea (n = 43) or as having mild (n = 27), moderate or severe obstructive sleep apnea (n = 21).

Insulin resistance and adipose-derived hormones in young men with untreated obstructive sleep apnea.

Purpose: Obstructive sleep apnea (OSA) increases the risk for insulin resistance (IR). The mechanisms that link the two are not clear and are frequently confounded by obesity. OSA is associated with alterations in adipose-derived hormones (adipokines) that increase IR; however, previous studies have focused on middle-aged and older adults.

The influence of aerobic exercise training on the double product break point in low-to-moderate risk adults.

The double product is the product of the heart rate and systolic blood pressure. The double product break point (DPBP) is a physiologic threshold that occurs at similar exercise intensities to that of the ventilatory threshold (VT). The influence of aerobic exercise training on the DPBP has not yet been examined.

Early evidence of increased risk for metabolic syndrome in young men with latent obstructive sleep apnea.

Background: Obstructive sleep apnea (OSA) is characterized by a repetitive collapse of the upper airway during sleep and may affect as many as 1 in 5 adults. Although OSA appears to increase risk for metabolic syndrome in middle-aged adults, no data currently exist in a younger, preclinical cohort.

Methods: Forty-five sedentary young men: 12 overweight with OSA (OSA), 18 overweight without OSA (NOSA), and 15 normal-weight without OSA (CON).

Physical activity habits of cardiac patients participating in an early outpatient rehabilitation program.

Purpose: The primary purpose of the study was to assess whether physical activity (PA) habits change following 4 to 6 weeks of an early outpatient cardiac rehabilitation (CR) program. A secondary purpose was to determine whether the PA habits differ on days attending CR versus not attending CR.

Methods: Fourteen men and 8 women completed the study (age = 65.

Altered ventilatory responses to exercise testing in young adult men with obstructive sleep apnea.

Background: Obstructive sleep apnea (OSA) is a disorder characterized by repetitive obstructions of the upper airway. Individuals with OSA experience intermittent hypoxia, hypercapnia, and arousals during sleep, resulting in increased sympathetic activation. Chemoreflex activation, arising from the resultant oscillatory disturbances in blood gases from OSA, exerts control over ventilation, and may induce increases in sympathetic vasoconstriction, contributing to increased long-term risks for hypertension (HTN) and cardiovascular disease (CVD).

Attenuated heart rate recovery following exercise testing in overweight young men with untreated obstructive sleep apnea.

Study Objective: To evaluate whether cardiovascular responses to maximal exercise testing and recovery are altered with obstructive sleep apnea (OSA) in overweight young adult men.

Design: Three sedentary subject groups were recruited: Overweight with OSA (OSA), overweight without OSA (No-OSA), and normal weight without OSA (Control). Presence of OSA was screened via portable diagnostic device.