The papers, and what they actually say

Williams TD, Tolusso DV, Fedewa MV, Esco MR. Comparison of periodized and non-periodized resistance training on maximal strength: a meta-analysis. Sports Medicine. 2017;47(10):2083–2100.

Finding. Across 18 studies and 81 effects, periodized training beat non-periodized training for 1RM strength (ES = 0.43, 95% CI 0.27–0.58). Undulating models did best; longer studies and higher frequency helped.

How Rhyno uses it. This is why Rhyno waves intensity inside every 4-week block instead of adding weight every week.

Ramírez-delaCruz M, Bravo-Sánchez A, Esteban-García P, Jiménez F, Abián-Vicén J. Effects of plyometric training on lower body muscle architecture, tendon structure, stiffness and physical performance: a systematic review and meta-analysis. Sports Medicine – Open. 2022;8:40.

Finding. 32 studies: plyometric training increased tendon stiffness (SMD 0.55), muscle thickness (0.59) and fascicle length (0.51), and improved jumping (0.61) and strength (0.57).

How Rhyno uses it. The evidence base for the elastic block. Springiness is trainable tissue quality, not a gift you lose at 40.

van Dyk N, Behan FP, Whiteley R. Including the Nordic hamstring exercise in injury prevention programmes halves the rate of hamstring injuries: a systematic review and meta-analysis of 8459 athletes. British Journal of Sports Medicine. 2019;53(21):1362–1370.

Finding. Programmes including the Nordic hamstring curl cut hamstring injury risk roughly in half (risk ratio 0.49, 95% CI 0.32–0.74).

How Rhyno uses it. One of the few 'insurance policy' exercises with real outcome data. It is in the program — with regressions shown, because full Nordics are brutal.

Behm DG, Blazevich AJ, Kay AD, McHugh M. Acute effects of muscle stretching on physical performance, range of motion, and injury incidence in healthy active individuals: a systematic review. Applied Physiology, Nutrition, and Metabolism. 2016;41(1):1–11.

Finding. Long static stretching before training costs performance (−4.6% at ≥60 s per muscle group); dynamic stretching helps slightly; a warm-up that stretches then moves shows no clear performance cost.

How Rhyno uses it. This is why the 12-minute primer is movement, not floor stretching — and why long holds live at the end of the session.

Morton RW, Murphy KT, McKellar SR, et al. A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults. British Journal of Sports Medicine. 2018;52(6):376–384.

Finding. 49 studies, 1,863 participants: protein supplementation increased 1RM strength and fat-free mass during prolonged resistance training. Gains in fat-free mass stopped improving beyond a total intake of about 1.6 g/kg/day (break point 1.62, 95% CI 1.03–2.20). Older age reduced the effect; being already trained increased it.

How Rhyno uses it. The protein floor on the nutrition page, and the reason Rhyno stops at 1.6–2.0 g/kg instead of chasing more.

Rolls BJ. The relationship between dietary energy density and energy intake. Physiology & Behavior. 2009;97(5):609–615.

Finding. People eat a fairly consistent weight of food, so lowering the energy density (kcal/g) of what is available lowers energy intake — across sexes, weight categories and even in young children. Trials adding water-rich foods produced substantial weight loss without instructions to restrict calories.

How Rhyno uses it. The mechanism that makes the lane rule work without counting anything: separating fat from starch drops a plate from roughly 2 kcal/g to 1.2.

Schoenfeld BJ, Aragon AA, Krieger JW. Effects of meal frequency on weight loss and body composition: a meta-analysis. Nutrition Reviews. 2015;73(2):69–82.

Finding. 15 studies, 30 treatment groups: meal frequency was not significantly associated with change in body mass, and the apparent benefit for body composition disappeared in sensitivity analysis — it came from a single study.

How Rhyno uses it. Permission to build the day around real life. Three meals, five meals, or one long fast: totals and adherence decide the outcome.

Zourdos MC, Klemp A, Dolan C, et al. Novel resistance training-specific rating of perceived exertion scale measuring repetitions in reserve. Journal of Strength and Conditioning Research. 2016;30(1):267–275.

Finding. RPE anchored to repetitions in reserve (RIR) tracked bar velocity closely in experienced lifters (r = −0.88), and less closely in novices (r = −0.77).

How Rhyno uses it. Rhyno uses RIR as the effort dial — and it works better the more training history you have, which is the point.

McGill SM, Karpowicz A. Exercises for spine stabilization: motion/motor patterns, stability progressions, and clinical technique. Archives of Physical Medicine and Rehabilitation. 2009;90(1):118–126.

Finding. The curl-up, side bridge and bird dog produce meaningful trunk-muscle activation at low spine load, and are progressable by changing leverage rather than adding compression.

How Rhyno uses it. Small lab study (8 healthy men). It is a biomechanics rationale, not an outcome trial — which is exactly how Rhyno treats it: short holds, never to failure.

Kjaer M. Role of extracellular matrix in adaptation of tendon and skeletal muscle to mechanical loading. Physiological Reviews. 2004;84(2):649–698.

Finding. Tendon and the surrounding connective-tissue matrix are living, mechanically responsive tissue: loading changes collagen turnover, cross-linking and stiffness — on a much slower timescale than muscle.

How Rhyno uses it. The reason connective tissue gets its own block every session, and the reason progress is deliberately slow.

Wolf M, Androulakis-Korakakis P, Fisher JP, Schoenfeld BJ, Steele J. Partial vs full range of motion resistance training: a systematic review and meta-analysis. International Journal of Strength and Conditioning. 2023;3(1).

Finding. Full or long range of motion was at least as good as partials for strength, size, power and speed; differences were trivial to small, and adaptations were partly specific to the range you train.

How Rhyno uses it. Honest reading: 'train the end range' is justified by specificity, not by a big hypertrophy edge. Rhyno trains full range and adds loaded end-range work on top.

Stöggl T, Sperlich B. Polarized training has greater impact on key endurance variables than threshold, high intensity, or high volume training. Frontiers in Physiology. 2014;5:33.

Finding. Nine weeks of polarized training (most volume easy, a little very hard, almost nothing in the middle) produced the largest gains in VO₂peak and time to exhaustion.

How Rhyno uses it. Trained endurance athletes, 9 weeks. It is the reason Rhyno's aerobic day is deliberately easy instead of a fifth hard session.

Düking P, Zinner C, Trabelsi K, et al. Monitoring and adapting endurance training on the basis of heart rate variability monitored by wearable technologies: a systematic review with meta-analysis. Journal of Science and Medicine in Sport. 2021;24(11):1180–1192.

Finding. HRV-guided training had a medium effect on submaximal physiology but small, non-significant effects on performance and VO₂peak — with fewer non-responders.

How Rhyno uses it. Why Rhyno logs readiness for charts but never lets an algorithm rewrite today's prescription.

Schoenfeld BJ, Aragon AA. How much protein can the body use in a single meal for muscle-building? Implications for daily protein distribution. Journal of the International Society of Sports Nutrition. 2018;15:10.

Finding. Review conclusion: target roughly 0.4 g/kg of protein per meal across at least four meals to reach a minimum of 1.6 g/kg/day; the often-quoted '20–25 g per meal ceiling' comes from fast-digesting protein given alone, not from mixed meals.

How Rhyno uses it. Why the protocol spreads protein across every meal instead of loading one, and why three meals means a bigger serving each.

DiFeliceantonio AG, Coppin G, Rigoux L, et al. Supra-additive effects of combining fat and carbohydrate on food reward. Cell Metabolism. 2018;28(1):33–44.e3.

Finding. In an auction task during fMRI, people paid more for foods combining fat and carbohydrate than for equally liked, equally caloric fat-only or carbohydrate-only foods, with supra-additive responses in the dorsal striatum. Participants could estimate the energy density of fat, but not of carbohydrate or of the combination.

How Rhyno uses it. The actual reason for one macro lane per meal. Not digestion, not insulin — reward. Fat-plus-carbohydrate is the most overeaten pair there is.

Impey SG, Hearris MA, Hammond KM, et al. Fuel for the work required: a theoretical framework for carbohydrate periodization and the glycogen threshold hypothesis. Sports Medicine. 2018;48(5):1031–1048.

Finding. Review proposing that carbohydrate availability be matched to the demands of the upcoming session rather than kept uniformly high or low. Training with reduced carbohydrate amplified adaptation signalling in most studies, but translated into better performance in only about a third of them.

How Rhyno uses it. Why carbohydrate on this protocol moves with the training day and sits around the session, instead of being a fixed daily number.

Whittaker J, Wu K. Low-fat diets and testosterone in men: systematic review and meta-analysis of intervention studies. The Journal of Steroid Biochemistry and Molecular Biology. 2021;210:105878.

Finding. Six intervention studies, 206 men: low-fat diets significantly lowered total testosterone (SMD −0.38), free testosterone (−0.37) and dihydrotestosterone (−0.30) compared with higher-fat diets, with a stronger effect in European and North American men.

How Rhyno uses it. Six small studies, so read it as a caution rather than a law — but it is why the protocol sets a fat floor instead of driving fat to zero.

Armstrong LE, Maresh CM, Castellani JW, et al. Urinary indices of hydration status. International Journal of Sport Nutrition. 1994;4(3):265–279.

Finding. Across two lab studies and one field study, urine colour correlated strongly with urine specific gravity and osmolality, and was judged good enough for athletic and field settings — though not precise enough for laboratory work.

How Rhyno uses it. Why the protocol's hydration target is a colour you can see rather than a litre count, and why the target is pale straw, not clear.

Shaw G, Lee-Barthel A, Ross ML, Wang B, Baar K. Vitamin C-enriched gelatin supplementation before intermittent activity augments collagen synthesis. The American Journal of Clinical Nutrition. 2017;105(1):136–143.

Finding. Gelatin plus vitamin C taken an hour before short, frequent loading raised a blood marker of collagen synthesis, and serum from those subjects increased collagen content in engineered ligaments.

How Rhyno uses it. Surrogate markers, not tendon outcomes in trained adults. Rhyno takes only the training implication from it: brief, frequent, repeated loading of tissue beats one heroic session.

Rio E, Kidgell D, Purdam C, et al. Isometric exercise induces analgesia and reduces inhibition in patellar tendinopathy. British Journal of Sports Medicine. 2015;49(19):1277–1283.

Finding. A single bout of heavy isometric holds cut tendon pain by 6.8/10 for at least 45 minutes and raised maximal voluntary contraction by ~19%.

How Rhyno uses it. Six volleyball players. Striking effect, tiny sample. Isometrics are in the program because they are low-cost and low-risk, not because this proves they must be.

Volk NR, Wambach JM, Bruder O, Meyer T, Kellmann M, et al. Recovery from eccentric squat exercise in resistance-trained young and master athletes with similar maximum strength. Frontiers in Physiology. 2021;12:665204.

Finding. Masters lifters (~52 y) did not reach higher fatigue levels or recover more slowly than young lifters (~22 y) of similar relative strength. Cold water immersion plus compression did not speed real recovery.

How Rhyno uses it. 16 men. Age is not automatically a recovery penalty — training history is. Rhyno manages fatigue with scheduled unloads, not ice baths.

Schoenfeld BJ, Aragon AA, Wilborn CD, Krieger JW, Sonmez GT. Body composition changes associated with fasted versus non-fasted aerobic exercise. Journal of the International Society of Sports Nutrition. 2014;11:54.

Finding. 20 women, four weeks, calorie-controlled and volume-equated: both the fasted and the fed training groups lost weight and fat mass, with no significant difference between them on any measure.

How Rhyno uses it. Small and short. Enough to say fasted training is a schedule choice, not a fat-loss lever — so train fasted if the day demands it, and stop expecting a bonus.

Wilke J, Schleip R, Yücesoy CA, Banzer W. Not merely a protective packing organ? A review of fascia and its force transmission capacity. Journal of Applied Physiology. 2018;124(1):234–244.

Finding. Cadaver and animal work shows real myofascial force transmission between synergists and along muscle-fascia chains; early human trials show non-local exercise effects.

How Rhyno uses it. Read the fine print: how much force transfers, and how much of the 'remote effect' is neural, is still contested. Rhyno trains long chains because it is cheap and plausible — it does not claim to 'fix your fascia'.