Lactic Acid In Muscle: A Case Study

Muscular hypertrophy occurs through anaerobic training and also causes an increase in lactate tolerance since the lactate produced is less concentrated enabling athletes to tolerate increased amounts. The greater extent of muscular hypertrophy and therefore lactate tolerance in males compared to females is evident in the greater number of attacking efforts performed by them whilst on field. During the 20 minutes of the game spent on field, males performed 88.5 attacking skills (approximately 4.43 maximal efforts per minute), while females performed 76.4 attacking skills (3.82 per minute) (Appendix 2). Due to insufficient recovery of CP, the anaerobic glycolysis system would have been dominant for these efforts. Males can tolerate more lactate hence perform more efforts. Furthermore, males had a higher average of 15.40 seconds in the speed endurance test compared to 17.19 seconds for females, indicating that males have greater lactate tolerance due to developed anaerobic adaptations including muscular hypertrophy (Appendix 1). As men have a greater lactate tolerance, they can work at higher anaerobic intensities for longer durations, therefore perform more maximal efforts such as repetitively

As the trials progressed, the strength of the muscles decreased as well because of the experienced muscle fatigue due to the lactate threshold. In

The initial burst of speed and subsequent 5 seconds in the 100m sprint, is fuelled by the Phosphagen ATP- PC system as there is 4-5 times more Phosphocreatine (PCr) readily available in the skeletal muscles compared to that of ATP (1). The initial ATP stored is used within 2 seconds of maximal activity by the Myosin ATPase enzyme to cleave energy, leaving Adenosine Diphosphate (ADP)

The Wingate Anaerobic Test is used to evaluate anaerobic cycling performance. This study was undertaken to determine whether there is a relationship between peak power and fatigue index for endurance (n=9) vs power (n=4) athletes. A total of 13 subjects, including 8 males and 5 females, were included in the study. The subjects were divided into sporting types, such as endurance and power. Data collected from the Wingate test included peak power (W), mean power (W), time to peak (S), minimum power (W) and fatigue index (%). When the peak power and fatigue index were considered together for endurance athletes, a significant relationship

This group will start the testing by attaining the medical records of the player to see if he is physically and physiologically capable to perform such strenuous activities. After that information is attained we will start by testing the player’s endurance with a two mile run and monitor the times, heart rate, Vo2 max, and try to evaluate the lactic threshold. Thereafter in the following days, we will attain the midfielder’s 1RM in all multiple joint lifts giving us a baseline for our percentages.

Burnout can have severe consequences for athletes, not only adversely impacting motivation and health, but also a subsequent reduction in performance and possible retiring from sport altogether (Madigan et al., 2015). Overtraining can be outlined as an accumulation of training and non-training stress that ends in long term impairment to an athletes performance that includes both physiological and psychological symptoms in which recovery can extend to years (Slivka, Hailes, Cuddy & Ruby, 2010). As overtraining is both physiological and psychological there is little understood about why there is a sudden decrease in all types of performance: resistance, anaerobic and aerobic; what is clear is that while most types of training, even burnout, can be remedied with reduced activity, overtraining is immune to most recovery strategies (Wilmore et al.,

(2014). A Consideration of the Paradigm of Exercise Physiology. Research In Sports Medicine, 22(3), 314-322.

The anaerobic threshold (AT), also called the “lactate threshold,” is the exertion level between aerobic and anaerobic training. The AT is the point during exercise where your body must switch from anaerobic to aerobic metabolism. Anaerobic exercise consists of weightlifting, sprinting, and jumping. Once an athlete reaches its anaerobic threshold, lactic acid builds up in the muscles faster than it can be cleared away resulting in muscle cramps. The AT is a useful measure for deciding exercise intensity for training and racing in endurance sports. On average untrained individuals have a low AT (approximately 55 % of VolumeO2max), and elite endurance athletes have a high AT (approx. 80 - 90% of VolumeO2max). lactate threshold.(1) Studies have been conducted on finding methods of improving anaerobic threshold. Lately High-intensity interval training (HIIT) has become a popular training modality in competitive athletes, recreationally-trained individuals, and clinical populations. HIIT consists of repeated bouts of short to moderate duration exercise

This conclusion was supported by the biological background. The greater amount of previous exercise would cause higher release of lactic acid, inorganic phosphate and also would increase the likelihood of micro damage to the muscle fibres. Thus, greater the amount of previous exercise could lead to greater muscle fatigue which affected the rate of contraction of muscle fibres. Consequently, lower number of cycles was counted within a given time limit, as the

This is seen when the player begins the game at a HR of 110bpm (Appendix 1), significantly higher than the average resting HR of 70bpm (lower for elite athletes). Consequently, the athlete feels less fatigued once the game begins as fatiguing by-products, such as lactate, would not accumulate as quickly due to higher available oxygen levels. It is recommended that an active recovery post game, like walking or jogging be performed to keep the HR elevated, enabling increased blood flow to the muscles and hence supplying oxygen to clear accumulating blood lactate. Male Touch Football players have a higher relative VO2 maximum (55.8ml/kg/min) compared to females (49.1ml/kg/min), therefore have greater oxygen supply which can be utilised by the muscles during recovery, resulting in a faster recovery (Appendix 2). This is evident as immediately post game males had a higher blood lactate level (7.9mmol/L) compared to females (7.6mmol/L) yet 20 minutes post game, males had a lower blood lactate level (3.2mmol/L) than females (3.3mmol/L) (Appendix 2).

I know that the more times I skip, lactic acid will build up in my legs, from my own experience this makes you fell horrible. As our bodies perform strenuous exercise, we begin to breathe faster as we attempt to move more oxygen to our working muscles. The body prefers to generate most of its energy using aerobic methods, meaning with oxygen. The cells follow the aerobic process when the blood supplies enough oxygen to the cells, which is:- Glucose+ oxygen—>Carbon Dioxide+ water+ Energy. But when the blood cannot get the needed oxygen to the cells, it has to get the energy from the glucose in another way. The cells use the anaerobic pathway; It does this then by breaking glucose down into lactic acid, Glucose—>Lactic Acid+ Energy. Lactic acid is released into the muscles when they have used up glucose stores but still have intense energy needs. Small amounts of lactic acid operate as a temporary energy source, which helps you avoid fatigue during a workout. However, a build-up of lactic acid during a workout can create burning sensations in the muscles that can slow down or halt your activity. This is not an effective energy source for long periods of exercise, so the blood takes lactic acid to the liver which coverts it back into glucose to be used in the normal aerobic process. Scientist are always looking into ways to decrease lactic acid build up in elite athletes so they can perform faster

Almost everyone who has pursued a sport with any seriousness has experienced muscle fatigue and the most commonly-cited culprit is lactic acid. However, viewing lactic acid as the metabolic 'bad guy' of athletics is fundamentally in error. In fact, "lactic acid is actually a fuel, not a caustic waste product. Muscles make it deliberately, producing it from glucose, and they burn it to obtain energy. The reason trained athletes can perform so hard and so long is because their intense training causes their muscles to adapt so they more readily and efficiently absorb lactic acid. The understanding now is that muscle cells convert glucose or glycogen to lactic acid. The lactic acid is taken up and used as a fuel by mitochondria, the energy factories in muscle cells" (Kolata 2006). What was long assumed to be harmful to athletic performance is in fact vitally necessary for sustained effort by the athlete. The reason that trained athletes may have less lactic acid and lower rates of fatigue than untrained athletes is that their bodies have learned to absorb the acid and use it as fuel more productively, not that their bodies produce less lactic acid.

During a moderate exercise, the rate of lactate in arterial blood is superior to three

including running on a treadmill to exhaustion were performed on fifteen participants to record their maximal heart rate and oxygen consumption. Participants ages ranged from 8 to 28 years, and body fat percentages from 14.9% to 33%. After the first tests were completed and the participants allowed their rates to reach normal levels then endured simulated 30 minute motocross races to measure biochemical and functional alterations caused by the racing heat. The results of that test displayed that every one of the participants spent at least 87% of the

Steady state exercise is the activity that achieves a balance between the energy required by working muscles and the rate of oxygen and delivery for aerobic ATP production. This lab is conducted to determine the heart rate in beats per minute (BPM), blood pressure (systolic and diastolic), and rating of perceived exertion response at rest to moderate cardiovascular exercise at a steady state workload and RPM. I hypothesized that exercising on an exercise bike the subjects participating in this study would have a higher rate of fatigue without fluid replacement than with fluid replacement.