Males tend to have a higher maximal oxygen uptake (VO₂max) due to having larger hearts, more muscle mass, more hemoglobin as well as less body fat than females. However, females often have proportionally more fatigue-resistant slow-twitch muscle fibers than males do. Some studies have even hinted that females may be able to burn fat for fuel more efficiently, which may be a result of estrogen’s (female sex hormone) effect on the metabolism.

Cardiovascular endurance relies on your cardiorespiratory system’s (circulatory system & respiratory system) ability to deliver oxygen to working muscles, where it can be used to produced energy. The benefit of producing energy aerobically (with oxygen) is that it can be used to produce vast amounts of energy, albeit at a relatively slow rate. This makes it especially important in prolonged low-intensity activities. The most accurate method to estimate endurance is maximal oxygen uptake (VO₂max), which describes the maximal amount of oxygen used during intense exercise.In no event shall Mendurance be liable for any damages whatsoever, whether direct, indirect, general, special, compensatory, consequential, and/or incidental, arising out of or relating to the conduct of you or anyone else in connection with the use of mendurance.co.uk, including without limitation, bodily injury, emotional distress, and/or any other damages. British Journal of Pharmacology– We even found research that connects l-arginine to male fertility, though indirectly. L-arginine plays a role in nitric oxide production and nitric oxide plays a role in sperm function, so the two go hand in hand. Keith, S.P., Jacobs, I. & McLellen T.M. (1992). Adaptations to training at the individual anaerobic threshold. European Journal of Applied Physiology and Occupational Physiology. Volume 65, Issue (4), pp. 316-323. Andro 400 is a natural ingredient formulated supplement that claims to boost testosterone and increase performance in men. The heart is a four-chamber pump responsible for circulating blood throughout the body. It consists of several layers of tough muscular tissue, known as the myocardium. Myocardium is covered by a thin layer of tissue on both sides; endocardium on the inside and pericardium on the outside.

Sahlin, K. (1992). Metabolic factors in fatigue. Sports Medicine. Volume 13, Issue (2). pp. 99–107. Sawyer, B.J., Blessinger, J.R., Irving, B.A., Weltman, A., Patrie. J,T. & Gaesser, G.A. (2010) Walking and running economy: inverse association with peak oxygen uptake. Medicine & Science in Sports and Exercise. Volume 42, Issue (11), pp. 2122-2127. Laursen, P.B. (2010). Training for intense exercise performance: High-intensity or high-volume training? Scandinavian Journal of Medicine and Science in Sports. Volume 20, Issue (2), pp. 1-10. Sandbakk, Ø., Ettema, G. & Holmberg, H.-C. (2012) Gender differences in endurance performance by elite cross-country skiers are influenced by the contribution from poling. Scandinavian Journal of Medicine & Science in Sports. Volume 24, Issue (1), pp. 28-33. Blood is a specialized fluid that consists of four components; plasma, red blood cells (erythrocytes), white blood cells (leukocytes), and platelets (thrombocytes). Blood has several functions that are essential for survival. These include:Unfortunately, users may experience some effects as per the ingredients in the formula, which include dizziness and diarrhea. Nugenix MacPherson R.E., Hazell, T.J., Olver, T.D., Paterson, D.H., & Lemon, P.W. (2011). Run sprint interval training improves aerobic performance but not maximal cardiac output. Medicine and Science in Sports & Exercise. Volume 43, Issue (1). pp. 115-122. Training at a higher intensity of 80-90% of maximum heart rate (zone 4) increases anaerobic capacity (the total amount of energy produced from the anaerobic energy systems) lactate tolerance, lactate threshold, and maximal oxygen uptake (VO₂max). This essentially means you will be able to perform longer at higher intensities.

Phytotherapy Research– Recent research has shown that “Fenugreek extract has a significant effect on total serum testosterone.” These results were reported in 2020 and based on a review of all available research to date. Wankhede S, Mohan V, and Thakurdesai P. Beneficial effects of fenugreek glycoside supplementation in male subjects during resistance training: A randomised controlled pilot study J Sport Health Sci.2016 (2):176-182 Ingham, S. (2008). Physiological and performance effects of low- versus mixed-intensity rowing training. Medicine and science in sports and exercise. Volume 40, Issue (3), pp. 579-584.Steele, J., Fisher, J., McGuff, D., Bruce-Low, S. & Smith, D. (2012). Resistance Training to Momentary Muscular Failure Improves Cardiovascular Fitness in Humans: A Review of Acute Physiological Responses and Chronic Physiological Adaptations. Journal of Exercise Physiology Online, Volume 15, Issue (3), pp. 53-80. Endurance can be best trained with prolonged low-intensity activities such as running, cycling, rowing, swimming, and cross-country skiing. The most effective training methods use specific heart rate zones to have a certain physiological adaptation. Because aerobic respiration occurs in the mitochondria, the amount, size, and function of them have a tremendous impact on the oxidative capacity of the muscle. Additionally, mitochondria can also recycle lactate and use it as a fuel source, resulting in improved lactate buffering at higher intensities.