title: Time-course of recovery of peak oxygen uptake after exercise-induced muscle damage.
abstract: V̇O2 peak has been shown to be reduced 48 h following exercise-induced muscle damage (EIMD), but it is unclear how long this reduction may persist. In this study eight endurance trained participants (21.5 ± 1.1 years old) performed a maximal exercise tests over 10-days followings EIMD. Cardiorespiratory variables were collected via open-circuit spirometry and soreness, maximal strength (MVC), motor-unit recruitment, and contractile properties were assessed prior to each test. MVC was reduced for up to 4-days (p ≤ 0.05) and soreness was evident for 10-days in the quadriceps (p < 0.05). V̇O2peak was reduced 7.4% 2-days post EIMD (55.5 ± 6.0 vs. 51.3 ± 5.8; p = 0.006) and remained reduced in 6 of 8 participants at 10-days post (p = 0.005). No relationship was found between changes in MVC, soreness, motor-unit recruitment, and contractile properties and changes in V̇O2peak (p > 0.05). EIMD resulted in small, but prolonged reductions in V̇O2peak. Our findings suggest mechanisms aside from force loss and soreness are primarily responsible for the reductions in V̇O2peak after EIMD.
authors.affiliation: Department of Health and Exercise Science, University of Oklahoma, Norman, OK USA; Department of Health, Exercise Science, and Recreation Management, University of Mississippi, Oxford, MS, USA. Electronic address: cblack@ou.edu.
authors.forename: Christopher D
authors.initials: CD
authors.lastname: Black
authors.affiliation: Department of Health and Exercise Science, University of Oklahoma, Norman, OK USA.
authors.forename: Alexander R
authors.initials: AR
authors.lastname: Gonglach
authors.affiliation: Department of Health and Exercise Science, University of Oklahoma, Norman, OK USA.
authors.forename: Robert E
authors.initials: RE
authors.lastname: Hight
authors.affiliation: Department of Health and Exercise Science, University of Oklahoma, Norman, OK USA.
authors.forename: Jessica B
authors.initials: JB
authors.lastname: Renfroe
mesh_terms: D000704:Analysis of Variance; D015444:Exercise; D005260:Female; D006801:Humans; D008297:Male; D009119:Muscle Contraction; D053580:Muscle Strength; D018482:Muscle, Skeletal / Q000503:physiopathology; D009135:Muscular Diseases / Q000209:etiology* / Q000503:physiopathology*; D010101:Oxygen Consumption / Q000502:physiology*; D010146:Pain / Q000209:etiology; D011659:Pulmonary Gas Exchange / Q000502:physiology; D020127:Recovery of Function / Q000502:physiology*; D013997:Time Factors; D055815:Young Adult
keywords: Contractile properties; DOMS; Gas-exchange threshold; Twitch-interpolation