Change in Femoral Cartilage Cross-Sectional Area After Aerobic and Resistance Exercise

Abstract

We compared the immediate response and recovery of femoral cartilage morphology following aerobic or resistance exercise to a control condition. Fifteen healthy young males (23.9 years; 170.1 cm; 69.7 kg) visited the laboratory three separate days and randomly performed one of the 30-min exercise aerobic exercises (treadmill running), resistance exercises (leg presses, back squats, and knee extensions), or seated rest as the control, each followed by the 50-min recovery. Ultrasonographic images of the femoral cartilage cross-sectional area (CSA) were obtained before and after exercise and every 5 min thereafter. To test exercise effects over time, a mixed model analysis of variance and Tukey–Kramer post-hoc tests were performed (p<0.05). The femoral cartilage CSA was different (condition×time: F_34,742=4.30, p<0.0001) and the femoral cartilage CSA was decreased after the aerobic (−5.8%, p<0.0001) and the resistance (−3.4%, p=0.04) exercises compared to the pre-exercise levels. Deformed femoral cartilage CSA took 35 and 10 min to return to the pre-exercise levels after aerobic and resistance exercises (p+>+0.09), respectively. Thirty minutes of moderate exertion performing aerobic or resistance exercises immediately reduced the femoral cartilage CSA. A rest period ranging from 10 to 35 min was required for cartilage recovery after weight-bearing exercises.

Keywords

cartilage deformation - ultrasonography - running - weightlifting - blood lactate concentration

Publication History

Received: 07 January 2024

Accepted: 17 April 2024

Accepted Manuscript online:
17 April 2024

Article published online:
01 June 2024

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