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How do they define fitness? It seems their definition is quite narrow. I cycle, and basically in the winter I do shorter rides more often to hit the same overa

How do they define fitness? It seems their definition is quite narrow. I cycle, and basically in the winter I do shorter rides more often to hit the same overall distance as I would in the summer. It's just not enjoyable for me dealing with awful road conditions and freezing hands and feet. E.g. in winter I'll do four or five 40 km rides per week, but in summer I do two or three 40 km rides and one 100+ km ride per week. It always takes me six weeks or a couple of months at the start of summer to build back up to doing 100+ km rides, even though I'm doing the same distance and spending similar amounts of time.

smcl 4y ago
I don't think this is saying 1 minute of high-intensity sprints is better than all other exercise, if you're doing multiple 40+ km bike rides per week you're probably not the intended audience for this type of exercise. However, I do think it is fair to use the word "fitness" as short-hand for what they were measuring because the below (from the "Results" in the Abstract linked) is a bit of a mouthful and doesn't neatly fit in the title: " Peak oxygen uptake increased after training by 19% in both groups (SIT: 32±7 to 38±8; MICT: 34±6 to 40±8ml/kg/min; p<0.001 for both). Insulin sensitivity index (CSI), determined by intravenous glucose tolerance tests performed before and 72 hours after training, increased similarly after SIT (4.9±2.5 to 7.5±4.7, p = 0.002) and MICT (5.0±3.3 to 6.7±5.0 x 10-4 min-1 [μU/mL]-1, p = 0.013) (p<0.05). Skeletal muscle mitochondrial content also increased similarly after SIT and MICT, as primarily reflected by the maximal activity of citrate synthase (CS; P<0.001). The corresponding changes in the control group were small for VO2peak (p = 0.99), CSI (p = 0.63) and CS (p = 0.97). "
rTX5CMRXIfFG 4y ago
From the abstract: > insulin sensitivity and other indices of cardiometabolic health The word “fitness” appears nowhere in the paper’s entire summary.

smcl 4y ago

I don't think this is saying 1 minute of high-intensity sprints is better than all other exercise, if you're doing multiple 40+ km bike rides per week you're probably not the intended audience for this type of exercise. However, I do think it is fair to use the word "fitness" as short-hand for what they were measuring because the below (from the "Results" in the Abstract linked) is a bit of a mouthful and doesn't neatly fit in the title: " Peak oxygen uptake increased after training by 19% in both groups (SIT: 32±7 to 38±8; MICT: 34±6 to 40±8ml/kg/min; p<0.001 for both). Insulin sensitivity index (CSI), determined by intravenous glucose tolerance tests performed before and 72 hours after training, increased similarly after SIT (4.9±2.5 to 7.5±4.7, p = 0.002) and MICT (5.0±3.3 to 6.7±5.0 x 10-4 min-1 [μU/mL]-1, p = 0.013) (p<0.05). Skeletal muscle mitochondrial content also increased similarly after SIT and MICT, as primarily reflected by the maximal activity of citrate synthase (CS; P<0.001). The corresponding changes in the control group were small for VO2peak (p = 0.99), CSI (p = 0.63) and CS (p = 0.97). "

rTX5CMRXIfFG 4y ago

From the abstract: > insulin sensitivity and other indices of cardiometabolic health The word “fitness” appears nowhere in the paper’s entire summary.