A low-cost Mr compatible ergometer to assess post-exercise phosphocreatine recovery kinetics

作者：Naimon Niels D; Walczyk Jerzy; Babb James S; Khegai Oleksandr; Che Xuejiao; Alon Leeor; Regatte Ravinder R; Brown Ryan; Parasoglou Prodromos

来源：Magnetic Resonance Materials in Physics Biology and Medicine, 2017, 30(3): 281-289.

DOI：10.1007/s10334-016-0605-9

• Phosphorus
• Human skeletal muscle
• Exercise
• Magnetic resonance spectroscopy

Objective To develop a low-cost pedal ergometer compatible with ultrahigh (7 T) field MR systems to reliably quantify metabolic parameters in human lower leg muscle using phosphorus magnetic resonance spectroscopy.
Materials and methods We constructed an MR compatible ergometer using commercially available materials and elastic bands that provide resistance to movement. We recruited ten healthy subjects (eight men and two women, mean age +/- standard deviation: 32.8 +/- 6.0 years, BMI: 24.1 +/- 3.9 kg/m(2)). All subjects were scanned on a 7 T whole-body magnet. Each subject was scanned on two visits and performed a 90 s plantar flexion exercise at 40% maximum voluntary contraction during each scan. During the first visit, each subject performed the exercise twice in order for us to estimate the intra-exam repeatability, and once during the second visit in order to estimate the inter-exam repeatability of the time constant of phosphocreatine recovery kinetics. We assessed the intra and inter-exam reliability in terms of the within-subject coefficient of variation (CV).
Results We acquired reliable measurements of PCr recovery kinetics with an intra-and inter-exam CV of 7.9% and 5.7%, respectively.
Conclusion We constructed a low-cost pedal ergometer compatible with ultrahigh (7 T) field MR systems, which allowed us to quantify reliably PCr recovery kinetics in lower leg muscle using P-31-MRS.

• 出版日期2017-6