Athletics Commentators on TV often talk about how lactic acid makes the muscles ‘burn’ and causes fatigue. The theory here is that lactic acid (which disassociates to lactate) and hydrogen (H+) accumulates within the muscles causing acidosis (excessive blood acidity). This causes a disruption of the muscle cells ability to contract (produce force). Fatigue is very complex and multifactorial, meaning there is *no single cause*. Lactic acid alone doesn’t cause fatigue, it’s the accumulation of metabolites that can impair muscle contraction.
How could lactate acid be involved in fatigue? The basic science
The energy demands of high-intensity exercise can easily exceed the energy capacity of the aerobic system (i.e. the aerobic system can’t produce energy rapidly enough for the exercise). This causes a reliance on anaerobic metabolism.
The reliance on anaerobic metabolism results in the accumulation of metabolites, such as inorganic phosphate (Pi) and hydrogen (H+). These metabolites are associated with muscular fatigue.
Basically, studies have revealed several steps where metabolites (Pi and H+) impair the ability of muscle to contract. When both metabolites are elevated, they act synergistically to cause ⬇️ in power. The 2nd graphic is from a paper that summarises this very complex process. The potential sites of fatigue are labelled (1–9) starting with the ability of the brain to activate the muscle.
Bioenergetic basis of skeletal muscle fatigue (Sundberg & Fitts, 2019) #athletics#highintensity#crossfit#exercise#training#hiit#workout#fatigue#physiology#lacticacid#sportscience
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If you weren’t paying attention you would have missed this big WIN from @nick.blum over at Vic Milers Club last week.
Little A’s state done for another year. My first year being a coach and probably not the last too. Thank you @thepondslittleathletics for giving me this opportunity and congrats to all the teams I coached, you guys all did amazing. • #relays#fun#athletics#squad
Congrats to our Falcons swimmers 🏊 Western Region Championship organised by Saudi swimming federation!
Adel Elbanna won 2 bronze 🥇 🥉, 50m Butterfly and 100m Freestyle. Age group 13_14
Sherif Zidan won 3 gold medals 🥇 , 200m Butterfly, 200m Freestyle and 200m Backstroke. Age group 11_12
So proud of Rushabh Solani to have finished his first ever 10K like a total boss! 💪🏼When Rushabh started training with me six months ago, he pretty much led a sedentary lifestyle with little daily mobility. We started off with the basic goal of getting fitter and stronger but two months ago, decided to pin it on a life goal he wanted to achieve. Being a big fan of the armed forces, the @wncnavyhalfmarathon was a perfect goal to set. Over the past two months, we focused on endurance building and conditioning. Today Rushabh, who had never run more than a kilometre till just six months ago, finished his 10K, feeling not gassed out but pumped up by the end of it. It's been a privilege for me to have been part of his transformation.
State football is over! Crazy two days in Laramie. I’ll post more later but for now, here’s one of my favorites of a quieter moment. Sheridan quarterback Jacob Boint (12) says a prayer over his team in their end of game huddle as a tear rolls down his face following their 35-26 victory over Thunder Basin in the state 4a championship Saturday, November 16.
Time Trial Sunday! Our Juniors are preparing for National Athletics, and congrats to our Runners completing the Queenstown Marathon, Half or 10 km! How can you get faster? “Run as much as you can without getting injured” (Dick Telford 2018) 😉 🚀 science?
🎃Feeling pumpkin SPICY today!🎃😂 Happy Fall TOT! Here’s your dose of Tuesday ridiculousness! 🥳👌🏻👌🏻The leaves have changed colour, I picked my pumpkins, and the flannel is out! Are you a fan of pumpkin spice and fall? I hate pumpkin spice lattes, the end of summer and the closeness of winter but do love the colours of the season! Have a fabulous day all of you fun ppl in my life!