┬áDecember – 2017
2017 Study:
– 38 sprint interval training trials from 34 studies
– sprint interval training is an effective means of improving aerobic capacity by avg. of 7.8% (as measured by change in VO2max)
– A greater improvement with less sprint intervals (~2-3 reps) especially compared to the high rep ranges >6
– However, the strength of evidence was greatest with protocols using a 4-6 rep range
– So to improve aerobic fitness, it may be worthwhile to incorporate SIT to a periodized program consisting of HIIT and mod-high intensity steady state bouts

CPP Human Performance Research Lab
Part 1
– During high to max effort exercise ATP demand is satisfied both aerobically and anaerobically
– Therefore, you cannot train anaerobic ATP production in isolation
– Specificity of conditioning programs should not be based on the sense that one can isolate and “train” any particular bioenergetics system
– Conditioning programs should be based on optimally improving the athletes capacity to:
1. produce ATP aerobically at higher work loads
2. reduce anaerobic contributions of ATP at higher work loads
3. contend with fatigue inducing anaerobic conditions (increased carnosine & bicarbonate buffering capacity and lactate recycling)
– These are the factors, at least from a bioenergetics perspective, that promote fatigue resistance, not from some unique improvement in “anaerobic fitness”
– With that said research demonstrates a wide variety of conditioning modes that promote these adaptations, even those commonly referred to as “anaerobic”
– From a practical perspective you can gauge anaerobic contributions by onset of blood lactate accumulation
– During the 800 you typically want to stay slightly below lactate/anaerobic threshold until the last 100ish meters. So yes almost 100% aerobic.
– The key therefore is to be able to perform higher work/speed aerobically. In other words improving the lactate threshold.

– The key principles to conditioning at least from a bioenergetic standpoint is to:
1. improve the capacity to produce ATP aerobically at higher work loads (increase white area under curve)
2. reduce the reliance on anaerobic ATP production (minimize red area under curve)
3. better contend with fatigue-inducing environment of anaerobic conditions (increase carnosine and bicarbonate buffering)

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