Dickinson Callie G, Mendez Kristin M, Holyfield Makayla D, Batchelor Nicholas T, McCully Kevin K
Department of Kinesiology, University of Georgia, Athens, GA.
Med Sci Sports Exerc. 2025 Jan 1;57(1):173-180. doi: 10.1249/MSS.0000000000003533. Epub 2024 Aug 20.
This study measured the time course mV̇O 2 max following both maximal and submaximal exercise.
Healthy male and female participants were tested ( n = 12 maximal and n = 8 submaximal exercise). A NIRS device was placed on the left medial gastrocnemius. Participants performed either 1 min of maximal, rapid (2 Hz), or submaximal (0.37 Hz) plantar flexion exercise on a custom pneumatic ergometer. mV̇O 2 max was measured before and immediately after exercise. mV̇O 2 max measurements consisted of four incomplete recovery curves of muscle metabolism taken after 30 s of electrical muscle stimulation except in the first post-exercise to be consistent with the use of pre-exercise trial. The four recovery curves were collected 50-, 156-, 260-, and 366-s postexercise, each producing an mV̇O 2 max rate constant.
After maximal exercise, muscle acceleration decreased to 52 ± 18% ( P = 0.001) of prevalues. mV̇O 2 max was reduced from the pre-exercise mean at the first post-trial (2.16 ± 0.44 to 1.21 ± 0.52 min -1 , P < 0.001). The fourth trial showed recovery from the first (2.2 ± 0.46 min -1 vs 1.21 ± 0.52 min -1 , P < 0.001) and was not significantly different from pre-exercise values (2.2 ± 0.46 vs 2.16 ± 0.44 min -1 , P = 0.41). No change in acceleration or mV̇O 2 max was seen after submaximal exercise ( P > 0.05).
The 56.7% reduction in mV̇O 2 max supports the hypothesis that in young, healthy individuals, a minute of maximal exercise transiently impairs mV̇O 2 max, which then recovers within 6 min. The NIRS method shows promise in tracking time course changes in mV̇O 2 max and warrants further investigation of the transient effects of exercise on mV̇O 2 max.
