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Objective: To examine whether a cardiac rehabilitation programme in a community based setting for patients with intermittent claudication (IC) affects walking ability, quality of life, and changes in health behaviour. The trial investigated a cross sector cardiovascular rehabilitation programme compared with usual care for patients having non-operative management., Methods: The trial allocated 118 patients, with 1:1 individual randomisation to either an intervention or control group. Data were collected at a department of vascular surgery and at a healthcare centre in Denmark. The rehabilitation intervention consisted of usual care plus 12 weeks of exercise training, pedometer, health education, and text messages. The primary outcome was maximum walking distance at six months measured by treadmill walking test. The secondary outcomes were maximum walking distance at 12 months and pain free walking distance measured by treadmill walking test, healthy diet, level of physical activity, and quality of life (QoL) at six and 12 months., Results: In the intervention group, 46 participants were analysed, with 47 in the control group. Following three months of rehabilitation, a 37% difference (95% CI 1.10 - 1.70; p = .005) was found between groups in maximum walking distance at six and 12 months, in favour of the intervention group. The same positive effect was found in physical activity, QoL, and healthy diet, but was not statistically significant in pain free walking distance and smoking., Conclusion: A specialised community based cardiac rehabilitation programme for patients with IC showed statistically and clinically significant effects on maximum walking distance, physical activity, quality of life, and healthy diet, but not on pain free walking distance and smoking, compared with usual care without rehabilitation., (Copyright © 2021 The Authors. Published by Elsevier B.V. All rights reserved.)

Aim: To explore how patients with intermittent claudication experiences participating in a community-based cardiovascular rehabilitation program and the various components of the rehabilitation program., Background: Intermittent claudication is a condition associated with progressive atherosclerosis that affects daily life. Most patients with intermittent claudication do not exercise even though exercise is essential in the treatment of this condition. Rehabilitation is reported to be effective in alleviating symptoms, increasing walking distance, reducing cardiovascular events, and improving quality of life. Patients' perspectives are important when designing such programs, however, this aspect has not previously been investigated., Design: A qualitative study., Methods: Patients with intermittent claudication (n=10) participating in a rehabilitation program were interviewed in two focus groups. Pragmatic philosophy inspired the approach. Data were analyzed using qualitative thematic analysis, and emerging themes were discussed according to self-efficacy theory., Results: Participants experienced social support from other patients, which motivated them to exercise. The intervention encouraged the patients' management of leg pain, while a local setting and a pedometer were important motivational factors to keep adherence to the program. The participants' experiences of the rehabilitation program are expressed in four themes revealed from the qualitative analysis: 1) the shared community, 2) pushing your own limits, 3) spurred by pedometers and health professionals, and 4) continuing new habits on your own. The participants found the components in the rehabilitation program meaningful, but encountered difficulties in continuing on their own after completion of the program., Conclusion: A specialized community-based cardiovascular rehabilitation program for patients with intermittent claudication can be supportive for patients suffering from intermittent claudication., Relevance to Clinical Practice: The qualitative results can be used to guide development of existing cardiac rehabilitation programs targeted patients with intermittent claudication in a community setting., Competing Interests: Declaration of Competing Interest None, (Copyright © 2021 The Authors. Published by Elsevier Inc. All rights reserved.)

Introduction: Intermittent claudication (IC) caused by peripheral artery disease (PAD) is a common cardiovascular disease. Patients with IC have reduced walking capacity, restricted activity levels and mobility, and reduced health-related quality of life. The disease leads to social isolation, the risk of cardiovascular morbidity, and mortality. Non-operative management of IC requires exercise therapy and studies show that supervised exercise training is more effective than unsupervised training, yet many patients with IC lack motivation for changes in health behaviour. No studies investigating the effects of existing cardiac rehabilitation targeted patients with IC have been published. The aim of this article is to present the rationale and design of the CIPIC Rehab Study, which examines the effect of a cross-sectoral rehabilitation programme versus usual care for patients in non-operative management for IC., Methods and Analysis: A randomised clinical trial aims to investigate whether cardiac rehabilitation for patients with IC in non-operative management versus usual care is superior to treatment as usual. The trial will allocate 118 patients, with a 1:1 individual randomisation to either the intervention or control group. The primary outcome is maximal walking distance measured by the standardised treadmill walking test. The secondary outcome is pain-free walking distance measured by the standardised treadmill walking test, healthy diet measured by a fat-fish-fruit-green score, and level of physical activity measured by an activity score within official recommendations. Statistical analyses will be blinded. Several exploratory analyses will be performed. A mixed-method design is used to evaluate qualitative and quantitative findings. A qualitative and a survey-based complementary study will be undertaken to investigate patients' post-discharge experiences. A qualitative post-intervention study will explore experiences of participation in rehabilitation., Discussion: The study is the first to assess the effect of a cardiac rehabilitation programme designed for patients with IC. The study will describe how to monitor and improve rehabilitation programmes for patients with IC in a real-world setting. Mixed-method strategies can allow for both exploration and generalisation in the same study, but the research design is a complex intervention and any effects found cannot be awarded a specific component., Trial Registration: Retrospectively registered in Clinicaltrials.gov identifier: NCT03730623.

Sound generation due to an orifice plate in a hard-walled flow duct which is commonly used in air distribution systems (ADS) and flow meters is investigated. The aim is to provide an understanding of this noise generation mechanism based on measurements of the source pressure distribution over the orifice plate. A simple model based on Curle's acoustic analogy is described that relates the broadband in-duct sound field to the surface pressure cross spectrum on both sides of the orifice plate. This work describes careful measurements of the surface pressure cross spectrum over the orifice plate from which the surface pressure distribution and correlation length is deduced. This information is then used to predict the radiated in-duct sound field. Agreement within 3 dB between the predicted and directly measured sound fields is obtained, providing direct confirmation that the surface pressure fluctuations acting over the orifice plates are the main noise sources. Based on the developed model, the contributions to the sound field from different radial locations of the orifice plate are calculated. The surface pressure is shown to follow a U 3.9 velocity scaling law and the area over which the surface sources are correlated follows a U 1.8 velocity scaling law.