How SportLegs primes muscles for more performance with less pain

When we begin to move, what powers our muscles until our lungs can catch up? Modern radioactive isotope tracers let scientists actually watch muscles borrow and trade lactate fuel to power muscles before the aerobic system catches up. Physiologists now recognize this “lactate shuttle” powers our Anaerobic energy system, which supplies most of our muscle energy during exercise. SportLegs uses natural-source lactate to prime this system to work its best.

“My University of Washington Sports Physiology professors say the idea behind SportLegs is ingenious, and we can’t understand why someone didn’t try this sooner.” -2004 email from triathlete Cameron Chesnut, Post Falls, Idaho

Research since the 1970s has refined our knowledge of how this miraculous energy system works: Muscles make lactate, exchange it, and use it for energy. The system works best when muscles make only as much lactate as they can use. Unfortunately, muscles instinctively make too much at the start of exercise, likely an evolutionary adaptation that helped our ancestors dodge sudden threats. Excess lactate degrades into lactic acid, source of the painful muscle “burn” and soreness that worsens with age. Muscles stop making excess lactate only after lactate concentration rises in the bloodstream. SportLegs replicates the same rise in blood lactate, only earlier. Taking SportLegs a half-hour before exercise raises blood lactate early, signaling muscles in time to prevent making excess lactate in the first place. SportLegs primes your Anaerobic energy system to perform more efficiently, delivering more endurance with less lactic acid.

REFERENCES:
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Wahren, J., P. Felig, G. Ahlborg and L. Jorfeldt. (1971) Glucose metabolism during leg exercise in man. J Clin Invest 50:2715-27258)

Ahlborg, G., L. Hagenfeldt and J. Wahren (1975) Substrate utilization by the inactive leg during one-leg or arm exercise. J Appl Physiol, 39:718-723

Ahlborg, G., L. Hagenfeldt and J. Wahren (1976) Influence of lactate infusion on glucose and FFA metabolism in man. Scan J Clin Lab Invest, 36:193-201

Poortmans, J. R., J. D.-V. Bossche and R. Leclercq (1978) Lactate uptake by inactive forearm during progressive leg exercise. J Appl Physiol, 45:835-839

Stamford, B. A., R.  J. Moffatt, A. Weltman, C. Maldonado and M. Curtis (1978) Blood lactate disappearance after supramaximal one-legged exercise. J Appl Physiol 45:244-248

Kreisberg, R. A. (1980) Lactate Homeostasis and Lactic Acidosis. Ann Intern Med. 1980 Feb;92(2 Pt 1):227-37. doi: 10.7326/0003-4819-92-2-227

Donovan, Casey M., and George A. Brooks (1983) Endurance training affects lactate clearance, not lactate production. Am. J. Physiol. 244 (Endocrinol. Metab. 7): E83-E92

Gladden, L. B. and J. W. Yates (1983) Lactic acid infusion in dogs: effects of varying infusate pH. J. Appl. Physiol. 54:1254-1260

Dodd, S., S. K. Powers, T. Callender and E. Brooks (1984) Blood lactate disappearance at various intensities of recovery exercise. J Appl Physiol 57:1462-1465

Ahlborg, G. (1985) Mechanism of glycogenolysis in nonexercising human muscle during and after exercise. Am J Physiol. 248(5 Pt 1):E540-5

Brooks, George A. (1986) The lactate shuttle during exercise and recovery. Med Sci Sports Exerc 18:361-368

Stanley, W. C., E. W. Gertz, J. A. Wisneski, R.A. Neese, D. L. Morris and G. A. Brooks (1986) Lactate extraction during net lactate release by the exercising legs of man. J. Appl. Physiol. 60:1116-1120

Mazzeo, R.S., G. A. Brooks, D. A. Schoeller and T.  F. Budinger (1986) Disposal of blood [1-13C] lactate in humans during rest and exercise. J Appl Physiol, 60:232-241

Richter, E. A., B. Kiens, B. Saltin, N. J. Christensen and G. Savard. (1988) Skeletal muscle glucose uptake during dynamic exercise in humans: role of muscle mass. Am J Physiol 254:E555-E561

Gladden, L. B. (1989) Lactate uptake by skeletal muscle. Exerc. Sports Sci. Rev. 17:115-155

Brooks, G. A., G. E. Butterfield, R.R. Wolfe, et al. (1991) Increased reliance on lactate during exercise after acclimatization to 4,300m. J. Appl. Physiol. 71:333-341

Roth, D. A. (1991) The sarcolemmal lactate transporter: transmembrane determinants of lactate flux. Med Sci Sports Exerc 23:925-934

Gladden, L. B., R. E. Crawford and M. J. Webster. (1994) Effect of lactate concentration and metabolic rate on net lactate uptake by canine skeletal muscle. Am. J. Physiol. 266:R1095-R1101

Brooks, G. A., E. E. Wolfel, G. E. Butterfield, et al. (1998) Poor relationship between arterial lactate and leg net release during steady-state exercise at 4,300 m altitude. J. Appl. Physiol. 275:R1192-R1201

Brooks, G. A., T. D. Fahey, T. P. White, K. M. Baldwin. (2000) Exercise Physiology. Human Bioenergetics and its Applications. 3rd edn. pp 804-805. Mayfield Publishing Company.

Sanders, Robert. Rehabilitating lactate: from poison to cure. UC Berkeley: Berkeley News May 23, 2018
 

SportLegs bottles will be available in early March.

We apologize for running out. International customers have discovered SportLegs, and they bought all we had for ski season. In the meantime, 5-capsule single-dose packets are available on this site for $2.49 each.

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