Camera Heart Rate Variability vs OxalWise

Camera Heart Rate Variability is the first app that lets you record, plot and export time and frequency domain Heart Rate Variability Features - without requiring any heart rate monitor. Camera HRV uses a technique called photoplethysmography (PPG for short), which consists in detecting changes in blood volume during a cardiac cycle, by illuminating the skin and measuring changes in light absorption. PPG has become quite a popular non-invasive method for extracting physiological measurements such as heart rate and oxygen saturation. However, most applications today focus simply on heart rate or respiration rate. Supported devices for the camera measurement: iPhones 5, 5S, 6, 6S, 6+, 6S+, SE, 7, 7+, 8, 8+, X, XS, XS Max, XR, 11, 11 Pro, 11 Pro Max, 12 mini, 12, 12 Pro, 12 Pro Max, 13 mini, 13, 13 Pro, 13 Pro Max Camera HRV can assess cardiac autonomic regulation through quantification of sinus rhythm variability. Since HRV aims at quantifying autonomic regulations, it can be used as marker of sympathetic or parasympathetic predominance, and therefore become relevant in many applications. In athletes for example heavy training is responsible for shifting the cardiac autonomic balance toward a predominance of the sympathetic over the parasympathetic drive, and HRV analysis attempts to quantify this shift. Other applications span from stress monitoring, assessment of pathological conditions and even emotional regulation during financial decision-making. Main Features: - extracts, plots, stores and exports heart rate, rr-intervals, time and frequency domain heart rate variability features (AVNN, SDNN, rMSSD, pNN50, LF, HF, LF/HF) - configurable time window for feature extraction (30 seconds to 5 minutes) - automatic RR-interval correction - event annotation - comparison between up to 3 recordings lets you get a better understanding of autonomic regulation and sympathetic/parasympathetic activity under different contexts in a glance - data export/storage on iTunes and Dropbox (csv format, exports heart rates, rr intervals, events and computed features). Data export needs to be performed from the history -> recording view, by clicking on the export button (bottom left). - integration with the Health app (writes Heart Rate and Heart Rate Variability) Find out more at this link: http://www.marcoaltini.com/2/post/2014/01/heart-rate-variability-using-the-phones-camera.html

Spinach, cooked, half a cup: 755 milligrams of oxalate — more than most stone formers' entire daily budget, in one side dish. Almonds by the ounce can do the same. Most oxalate guides just tell you to avoid these foods. OxalWise tells you what to eat instead. OxalWise is a private, no-account food reference for people managing calcium-oxalate kidney stones through diet. Search 316 foods, organized into four plain-language bands — low, moderate, high, very high — instead of decimals you have to interpret yourself. Every entry states its serving size and comes with a swap: almonds run high, macadamias barely register; spinach is very high, kale is close in nutrition and a fraction of the oxalate. Set a daily oxalate budget (50, 100, 150 mg, or your own number — most care teams suggest 100, some set 50) and log what you eat with one tap. Watch the ring, not a spreadsheet. The Science guide covers what actually matters: the five levers of stone prevention — fluid, dietary calcium taken with meals, sodium, oxalate, and citrate. Cutting calcium is the intuitive move and the wrong one: calcium eaten with food binds oxalate in your gut before it's absorbed. Boiling and draining high-oxalate vegetables removes roughly a third to over half; steaming and baking remove almost none. No accounts. No ads. No subscription. No analytics. Your tracker log stays on your device — we never see it, and we couldn't sell it if we wanted to. The Food Atlas, Science guide, and FAQ are free forever. The Daily Tracker gives you 10 free logs to try it; after that, a single one-time purchase unlocks unlimited logging for good. No recurring charge, ever. OxalWise is an educational reference, not medical advice. Always follow your physician or registered dietitian's guidance, especially if you have kidney disease, enteric hyperoxaluria, or a history of stones.