Metabolic and physiological effects of high intensity interval training in patients with knee osteoarthritis: A pilot and feasibility study

• Published in: Osteoarthritis and cartilage open 2020-12, Vol.2 (4), p.100083-100083, Article 100083
• Main Authors: Smith-Ryan, Abbie E., Blue, Malia N.M., Anderson, Kara C., Hirsch, Katie R., Allen, Kelli D., Huebner, Janet L., Muehlbauer, Michael J., Ilkayeva, Olga R., Kraus, Virginia Byers, Kraus, William E., Golightly, Yvonne M., Huffman, Kim M.
• Format: Article
• Language: English
• Subjects: Exercise therapy; Interval training; Metabolomics; ORIGINAL PAPER; Osteoarthritis; Pain
• ISSN: 2665-9131; 2665-9131
• DOI: 10.1016/j.ocarto.2020.100083

To examine the feasibility of a 6-week high intensity interval training (HIIT) program in patients with symptomatic knee osteoarthritis (OA). A secondary aim was to evaluate the change in whole-body metabolism. In a single-arm intervention, 16 adults (mean age 59.9 yrs; BMI: 29.0 ± 4.3 kg/m2; 77% female) with radiographically diagnosed knee OA (Kellgren-Lawrence [KLG]: 2–4) and moderate to severe pain score (≥6) from the Western Ontario and McMasters Universities Index (WOMAC) enrolled in a 6-week, twice weekly, supervised HIIT cycle ergometry intervention. The primary outcome was feasibility; secondary outcomes included change in peak oxygen consumption (VO2peak), WOMAC, and circulating biomarkers of metabolism. Feasibility was moderate; of the 21 participants screened by phone, 16 were enrolled; 13 completed pre- and post-testing. The average adherence rate (sessions completed/available) was >96%. VO2peak was significantly improved (mean ± SD: 2.6 ± 3.0 mL/min/kg; 95% CI [0.70–4.56]). Significant improvements in WOMAC (mean ± SD: −8.7 ± 12.5; CI: [18.9 to −2.80]), pain [-5.15 to −1.01], and function [-12.9 to −0.98] resulted. There was a significant reduction in concentrations of amino acids: methionine, phenylalanine, and tyrosine (p