Please use the Returns Support Centre to return a defective item within 30 days of receipt of delivery. If your reasonable return shipping costs exceed S$30, Contact us before shipping the item and provide evidence to us to substantiate the reasonable costs incurred, for which you will be reimbursed. You may return a defective, faulty, damaged, or incorrect item for a full refund of the price you paid, including original delivery costs, Import Fees Deposit and a credit of S$30 to cover reasonable substantiated delivery costs associated with returning the item(s) to us. If we receive your returned item(s) after 45 days from receipt of delivery, we may deduct a 20% restocking fee from your refund. Please note that it can take up to 15 days for an item to reach us once you return it. Change of mind returns within 30 days of receipt of delivery are easy with our online Returns Support Centre. Unless otherwise stated, original delivery costs, Import Fees Deposit and return shipping for change of mind returns are not refunded. You may return most new and unopened Amazon International Store items within 30 days of delivery for a full refund of the price you paid. Personal Care Appliances 15 Days ReturnableĬlothing and Accessories 30 Days Returnable Sports, Fitness and Outdoors 15 Days Returnable Pet Habitats and Supplies, Apparel and Leashes, Training and Behavior Aids, Toys, Aquarium Supplies such as Pumps, Filters and Lights 15 Days Returnable Please see our Amazon International Store Returns policy for information about returning Amazon International Store items.ĭesktops, Monitors, Pen drives, Hard drives, Memory cards, Computer accessories, Graphic cards, CPU, Power supplies, Motherboards, Cooling devices, TV cards & Computing Components 15 Days Returnableĭigital Cameras, camera lenses, Headsets, Speakers, Projectors, Home Entertainment (new and certified refurbished) 15 Days Returnable To determine whether items sold and fulfilled by a third-party seller can be returned, check the returns policy set by the seller. Third-party sellers on Amazon.sg are expected to offer returns on an equivalent basis, but their policies may vary. Unless otherwise stated, original shipping charges will not be refunded on returns due to customer choice/error. Replacements are only available for items that are sold and fulfilled by Amazon SG – see About Replacements and Amazon.sg Refunds Policy.ĭamaged/defective or any Amazon error returns will receive a full refund including a refund of original shipping charges. When you return an item, you may see an option for a refund or replacement. Products are returnable on Amazon.sg within the 15 day return window for any reason on Amazon.sg. Heart rate variability (HRV), the change in the time intervals between adjacent heartbeats, is an emergent property of interdependent regulatory systems that operate on different time scales to adapt to challenges and achieve optimal performance.Video Games (Accessories and Games) 15 Days Returnable This article briefly reviews neural regulation of the heart, and its basic anatomy, the cardiac cycle, and the sinoatrial and atrioventricular pacemakers. The cardiovascular regulation center in the medulla integrates sensory information and input from higher brain centers, and afferent cardiovascular system inputs to adjust heart rate and blood pressure via sympathetic and parasympathetic efferent pathways. This article reviews sympathetic and parasympathetic influences on the heart, and examines the interpretation of HRV and the association between reduced HRV, risk of disease and mortality, and the loss of regulatory capacity. This article also discusses the intrinsic cardiac nervous system and the heart-brain connection, through which afferent information can influence activity in the subcortical and frontocortical areas, and motor cortex. It also considers new perspectives on the putative underlying physiological mechanisms and properties of the ultra-low-frequency (ULF), very-low-frequency (VLF), low-frequency (LF), and high-frequency (HF) bands. Additionally, it reviews the most common time and frequency domain measurements as well as standardized data collection protocols. In its final section, this article integrates Porges' polyvagal theory, Thayer and colleagues' neurovisceral integration model, Lehrer et al.'s resonance frequency model, and the Institute of HeartMath's coherence model. The authors conclude that a coherent heart is not a metronome because its rhythms are characterized by both complexity and stability over longer time scales. Future research should expand understanding of how the heart and its intrinsic nervous system influence the brain. In a healthy organism, there is a dynamic relative balance between the sympathetic nervous system (SNS) and parasympathetic nervous system (PNS). PNS activity predominates at rest, resulting in an average HR of 75 beats per minute (bpm).
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |