title: Total daily energy expenditure is increased following a single bout of sprint interval training.
abstract: REGULAR ENDURANCE EXERCISE IS AN EFFECTIVE STRATEGY FOR HEALTHY WEIGHT MAINTENANCE, MEDIATED VIA INCREASED TOTAL DAILY ENERGY EXPENDITURE (TDEE), AND POSSIBLY AN INCREASE IN RESTING METABOLIC RATE (RMR: the single largest component of TDEE). Sprint interval training (SIT) is a low-volume alternative to endurance exercise; however, the utility of SIT for healthy weight maintenance is less clear. In this regard, it is feasible that SIT may evoke a thermogenic response above and beyond the estimates required for prevention of weight gain (i.e., >200-600 kJ). The purpose of these studies was to investigate the hypotheses that a single bout of SIT would increase RMR and/or TDEE. Study 1: RMR (ventilated hood) was determined on four separate occasions in 15 healthy men. Measurements were performed over two pairs of consecutive mornings; each pair was separated by 7 days. Immediately following either the first or third RMR measurement (randomly assigned) subjects completed a single bout of SIT (cycle ergometer exercise). RMR was unaffected by a single bout of SIT (7195 ± 285 kJ/day vs. 7147 ± 222, 7149 ± 246 and 6987 ± 245 kJ/day (mean ± SE); P = 0.12). Study 2: TDEE (whole-room calorimeter) was measured in 12 healthy men, on two consecutive days, one of which began with a single bout of SIT (random order). Sprint exercise increased TDEE in every research participant (9169 ± 243 vs. 10,111 ± 260 kJ/day; P < 0.0001); the magnitude of increase was 946 ± 62 kJ/day (∼10%). These data provide support for SIT as a strategy for increasing TDEE, and may have implications for healthy body weight maintenance.
authors.affiliation: Department of Food Science and Human Nutrition, Colorado State University Fort Collins, Colorado.
authors.forename: Kyle J
authors.initials: KJ
authors.lastname: Sevits
authors.forename: Edward L
authors.initials: EL
authors.lastname: Melanson
authors.forename: Tracy
authors.initials: T
authors.lastname: Swibas
authors.forename: Scott E
authors.initials: SE
authors.lastname: Binns
authors.forename: Anna L
authors.initials: AL
authors.lastname: Klochak
authors.forename: Mark C
authors.initials: MC
authors.lastname: Lonac
authors.forename: Garrett L
authors.initials: GL
authors.lastname: Peltonen
authors.forename: Rebecca L
authors.initials: RL
authors.lastname: Scalzo
authors.forename: Melani M
authors.initials: MM
authors.lastname: Schweder
authors.forename: Amy M
authors.initials: AM
authors.lastname: Smith
authors.forename: Lacey M
authors.initials: LM
authors.lastname: Wood
authors.forename: Christopher L
authors.initials: CL
authors.lastname: Melby
authors.forename: Christopher
authors.initials: C
authors.lastname: Bell
keywords: Exercise; metabolism; thermogenic; weight maintenance