Are Wearable Photoplethysmogram-Based Heart Rate Variability Measures Equivalent to Electrocardiogram? A Simulation Study.

Background: Traditional electrocardiography (ECG)-derived heart rate variability (HRV) and photoplethysmography (PPG)-derived "HRV" (termed PRV) have been reported interchangeably. Any potential dissociation between HRV and PRV could be due to the variability in pulse arrival time (PAT; time between heartbeat and peripheral pulse).

Objective: This study examined if PRV is equivalent to ECG-derived HRV and if PRV's innate error makes it a high-quality measurement separate from HRV.

Experimental evidence on a "light-touch" personalized email intervention in an online, undergraduate physiology course.

In large physiology classes, there is a demand for low-effort, or "light touch," strategies that faculty can use to connect with students and promote increased academic performance and student engagement. The purpose of this study was to compare personalized versus standardized emails following unit quizzes on student perceptions of faculty engagement, participation in academic resources, and academic performance in a junior-level, online physiology course. Students completed the online unit quiz and received a subsequent feedback email from the course director.

Peer-supported physical activity intervention for academic probation freshmen in a physiology-related major: a feasibility study.

To retain students on academic probation, physiology and physiology-related programs may offer a variety of academic support initiatives. This pilot research study examined the feasibility and perceptions of implementing a success coach-led physical activity (PA) program for freshmen on academic probation in a physiology-related program. Freshman on academic probation [grade point average (GPA) <2.

Arch Stiffness Does Not Determine Running Economy in Recreational Runners.

The primary purpose of this study was to determine the relationship between foot length, arch stiffness, and running economy in recreational runner at low running velocities. Sixteen trained endurance (age 20.5 ± 0.

Perceptions of academic preparedness of first-gen freshmen in a physiology major inform recommendations for program-level academic development initiatives.

Many factors contribute to students' academic success, and some, including first-generation (FG) college student status and academic preparation, are especially relevant in physiology programs. The purpose of this qualitative study was to examine FG college students' perceptions of academic preparedness and intended success strategies with the goal of informing program-level strategies to support FG students in similar undergraduate physiology-related programs. FG freshmen completed short surveys and reflections at the start and end of the semester.

Differences in joint power distribution in high and low lactate threshold cyclists.

Purpose: The biomechanical differences between cyclists with a high compared with a low blood lactate threshold (HLT; 80% VO vs LLT, 70% VO) have yet to be completely described. We hypothesize that HLT cyclists reduce the stress placed on the knee extensor muscles by increasing the relative contribution from the hip joint during high-intensity cycling.

Method: Sixteen well-trained endurance athletes, with equally high VO while cycling and running completed submaximal tests during incremental exercise to identify lactate threshold ([Formula: see text]) while running and cycling.

Cardiovascular responses to exercise when increasing skin temperature with narrowing of the core-to-skin temperature gradient.

The decline in stroke volume (SV) during exercise in the heat has been attributed to either an increase in cutaneous blood flow (CBF) that reduces venous return or an increase in heart rate (HR) that reduces cardiac filling time. However, the evidence supporting each mechanism arises under experimental conditions with different skin temperatures (T; e.g.

The relationship between isometric force-time curve characteristics and club head speed in recreational golfers.

The primary purpose of the present investigation was to examine the relationships between club head speed, isometric midthigh pull performance, and vertical jump performance in a cohort of recreational golfers. Twelve recreational golfers (age, 20.4 ± 1.