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April 26, 2016PLoS ONEOpen Access

Sprint interval training increased peak oxygen uptake by 19% and improved insulin sensitivity to the same extent as moderate-intensity continuous training despite a five-fold lower exercise volume.

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Why the study?

Does sprint interval training improve insulin sensitivity and peak oxygen uptake similarly to moderate-intensity continuous training in sedentary men?

Population

25 sedentary men, mean age 27±8 years, BMI 26±6 kg/m2.

Comparison

Sprint interval training involving 3x20-second… vs Moderate-intensity continuous training involving…

Design

Cohort

Follow-up

12 weeks

Key result

Sprint interval training increased peak oxygen uptake by 19% and improved insulin sensitivity to the same extent as moderate-intensity continuous training despite a five-fold lower exercise volume.

Authors

JGJenna B. GillenBMBrian J. MartinMMMartin J. MacInnis

Discussion

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Overview

May support time-efficient sprint training for fitness and insulin sensitivity gains in sedentary men; hypothesis-generating and needs larger randomized confirmation.

Study Design

Type

RCT (n=27)

Blinding

Open-label

Multicenter

No

Structured PICO

Does sprint interval training improve insulin sensitivity and peak oxygen uptake similarly to moderate-intensity continuous training in sedentary men?

P
Population
25 sedentary men, mean age 27±8 years, BMI 26±6 kg/m2.
I
Intervention
Sprint interval training (SIT) involving 3x20-second 'all-out' cycle sprints (~500W) interspersed with 2 minutes of cycling at 50W, plus 2-minute warm-up and 3-minute cool-down (10 minutes total per session), 3 sessions per week for 12 weeks.
C
Comparator
Moderate-intensity continuous training (MICT) involving 45 minutes of continuous cycling at ~70% maximal heart rate (~110W), plus 2-minute warm-up and 3-minute cool-down (50 minutes total per session), 3 sessions per week for 12 weeks, and a non-training control group.
O
Outcome
Insulin sensitivity index (CSI) and peak oxygen uptake (VO2peak) at 12 weeks.surrogate

Main Result

Absolute Event Rate: 38% vs 40%

p-value: p=<0.001

Sprint interval training provides similar cardiometabolic benefits to traditional endurance training in sedentary men despite a five-fold lower exercise volume and time commitment.

Limitations

  • Small sample size
  • Only included men
  • Requires a very high level of motivation for 'all out' efforts
  • Lack of long-term adherence data

Cite This Study

Gillen et al. (2016) conducted an RCT in Sedentary (n=27). Sprint interval training (SIT) vs. Moderate-intensity continuous training (MICT) and non-training control was evaluated on Peak oxygen uptake (VO2peak) (p=<0.001). Sprint interval training increased peak oxygen uptake by 19% and improved insulin sensitivity to the same extent as moderate-intensity continuous training despite a five-fold lower exercise volume.

synapsesocial.com/papers/6a1392507fc80bf722c65e80https://doi.org/10.1371/journal.pone.0154075
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