Key result
An inverted body position cool-down resulted in a 22% slower heart rate (P<0.0001) and 14% lower energy expenditure vs active cool-down, and 23% lower blood lactate vs passive cool-down.
Why the study?
Does an inverted body position cool-down strategy improve blood lactate removal and reduce energy expenditure compared to active or passive cool-downs in healthy subjects after intense running?
RCT (n=15)
Counterbalanced order
Does an inverted body position cool-down strategy improve blood lactate removal and reduce energy expenditure compared to active or passive cool-downs in healthy subjects after intense running?
Effect estimate: 22% slower HR, 14% lower energy expenditure vs active; 23% lower lactate vs passive
p-value: p=<0.0001
An inverted body position cool-down strategy achieves similar blood lactate removal to an active cool-down but with significantly less energy expenditure.
Should not yet change cool-down protocols; hypothesis-generating for recovery optimization.
We compared the immediate effects of a cool-down strategy including an inverted body position (IBP: continuous 30-s alternations of supine and IBP) after a short period of an intense treadmill run with active (walking) and passive (seated) methods. Fifteen healthy subjects (22 years, 172 cm, 67 kg) completed three cool-down conditions (in a counterbalanced order) followed by a 5-min static stretch on three separate days. Heart rate, energy expenditure, blood lactate concentration, fatigue perception, and circumference of thighs and calves were recorded at pre- and post-run at 0, 5, 10, 20, and 30 min. At 5 min post-run, subjects performing the IBP condition showed (1) a 22% slower heart rate (p < 0.0001, ES = 2.52) and 14% lower energy expenditure (p = 0.01, ES = 0.48) than in the active condition, and (2) a 23% lower blood lactate than in the passive condition (p = 0.001, ES = 0.82). Fatigue perception and circumferences of thighs and calves did not differ between the conditions at any time point (F10,238 < 0.96, p < 0.99 for all tests). IBP appears to produce an effect similar to that of an active cool-down in blood lactate removal with less energy expenditure. This cool-down strategy is recommended for tournament sporting events with short breaks between matches, such as Taekwondo, Judo, and wrestling.
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Kim et al. (2020) conducted an RCT in Healthy subjects post-intense running (n=15). Inverted body position (IBP) vs. Active (walking) and passive (seated) cool-down was evaluated on Heart rate, energy expenditure, and blood lactate concentration at 5 min post-run (22% slower HR, 14% lower energy expenditure vs active; 23% lower lactate vs passive, p=<0.0001). An inverted body position cool-down resulted in a 22% slower heart rate (P<0.0001) and 14% lower energy expenditure vs active cool-down, and 23% lower blood lactate vs passive cool-down.
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