I tested the running, still not there. Not really a 'restful' week with 15+ miles of hiking and biking. Some of the longer hikes I felt some knee stiffness, so not fully rested.
Stretches, drills, 50m stride
2 x 100m w/ 30 sec rest on turf - 18-19 sec. pace
50m and 100m hill
4 x 500m rower w/ 1 min rest - 2:02, 2:09, 2:11, 2:13 (2:09 avg)
Seems it's going to take a long time if I'm ever going to be able to do workouts with pain free running. Maybe should set my sights on indoor season next year and just take more time off. I don't want to force it. It was better 4 months ago. I was also taking a lot of collagen supplements then and now I'm thinking about starting again. Still not at optimum weight.
144.5 lbs after workout.
You would think with your experience with supplements causing liver injury you would avoid them. The data on collagen supplements is almost entirely funded by the industry and the studies are considered low quality. The probability that they are effective is low. Risks include
ReplyDelete1. Contamination and Purity (Major Concern)
Because the FDA does not regulate supplements for safety or purity before they reach the market, the quality of the product depends entirely on the manufacturer.
UT MD Anderson
UT MD Anderson
+1
Heavy Metals: Studies have found that some popular collagen brands contain measurable levels of arsenic, lead, mercury, and cadmium. These toxins can accumulate in animal bones and connective tissues—the very parts used to make collagen.
Unlisted Additives: Supplements may contain fillers, synthetic chemicals, or high doses of other nutrients (like biotin) that can interfere with medical lab tests for thyroid or heart function.
LEMAlab®
LEMAlab®
+5
2. Kidney and Metabolic Risks
Kidney Stones: Collagen is high in hydroxyproline, an amino acid that the body can convert into oxalate. High levels of oxalate in the urine are a major trigger for calcium oxalate kidney stones, particularly in those already prone to them.
Kidney Strain: As a concentrated protein, excessive intake can put additional stress on the kidneys, which is a significant risk for individuals with pre-existing kidney disease.
Hypercalcemia: Some collagen derived from marine sources (like fish bones) may contain high calcium levels, potentially leading to hypercalcemia (excess calcium in the blood), which can cause heart rhythm issues or confusion.
eGFR at the lower normal represents about a 50 percent reduction in nephrons. It would be equivalent to you going through an optimal 6 months training period yet only capable of a 120 seconds 400 meters. Your eGFR is not the only data imaging shows some atrophy consistent with nephron loss. Your priority should be kidney health. Taking a supplement that has potential contamination and has a compound your body uses to produce oxalate endogenously makes no sense. Plus it is another protein source in a diet already too high in protein for optimal nephron preservation.
I had been using collagen supplements almost daily since my surgery in 2019 + type II collagen capsules. I abruptly stopped in Oct when I got high liver enzyme readings. The brand I'm using is Collagen Synthesis - supposedly 3rd party tested for purity, won "Product of the Year" award in Sports Nutrition 2023. They list numerous studies. https://pubmed.ncbi.nlm.nih.gov/21251991/.
Deletehttps://pmc.ncbi.nlm.nih.gov/articles/PMC5950747/
https://pubmed.ncbi.nlm.nih.gov/28177710/
https://pmc.ncbi.nlm.nih.gov/articles/PMC4594048/
and a dozen more....
Is collagen the only variable in training or lifestyle that has changed over the last 4 months ?
ReplyDeletePretty much
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