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Aim <p>To examine the association of muscle strengthening activities with knee extension strength, gait speed, and skeletal muscle index in adultsaged 50-64 and ≥65 years.</p> Findings <p> Muscle strengthening activities are linked to better gait speed, knee extension strength, and skeletal muscle index mainly in middle-aged adults (50-64 years), with weaker or no associations in older adults except for higher activity frequency (≥8 sessions/month), benefi tingstrength in those ≥65 years.</p> Message <p> Muscle strengthening activities are linked to better physical function and muscle health in middle-aged compared to older adults,although frequency may be a confounding parameter.</p> Background <p>This study examined the association of muscle strengthening activities (MSA) with knee extension strength (KES) and gait speed (GS) (n = 2169), and skeletal muscle index (SMI; n = 765) in adults aged 50–64 and ≥ 65&#xa0;years.</p> Methods <p>Data were drawn from the National Health and Nutrition Examination Survey 1999–2018 cycles. MSA were self-reported based on engagement with weightlifting, push-ups, or sit-ups. MSA frequency was categorized as ≥ 8 or &lt; 8 sessions/month. Linear and logistic regressions were performed, adjusting for demographic and clinical covariates.</p> Results <p>MSA were associated with improved GS and KES across adults aged 50–64&#xa0;years in fully adjusted models (GS: β = -0.24, 95% CI − 0.42 to − 0.07; KES: β = 31.7, 95% CI 18.9&#xa0;to&#xa0;44.5) but not in those ≥ 65&#xa0;years (GS: <i>p</i> = 0.07; KES: <i>p</i> = 0.11). For SMI, a significant positive association emerged only in the 50–64-year old group after adjustments (β = 0.18, 95% CI 0.03&#xa0;to&#xa0;0.34; ≥ 65&#xa0;years → <i>p</i> = 0.53). Age interaction (≥ 65 vs. 50–64&#xa0;years) showed significant MSA associations with GS and KES, though SMI results were inconsistent. Finally, higher MSA frequency for ≥ 65 versus 50–64&#xa0;years was linked to higher KES (β = 22.0, <i>p</i> = 0.03), but not GS (<i>p</i> = 0.05) or SMI (<i>p</i> = 0.64).</p> Conclusions <p>MSA are associated with higher KES and GS in middle-aged, but not in older adults. Higher MSA frequency is linked to increased KES in older adults.</p>

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Muscle strengthening activities: cross-sectional associations with skeletal muscle outcomes in adults aged 50–64 and 65 years and above

  • 期刊论文

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  • 发表日期：

    2025年10月13日

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  • Konstantinos Prokopidis,
  • Stefano Cacciatore,
  • Paolo Piaggi,
  • Davide Liborio Vetrano,
  • Mathias Schlögl

摘要

Aim

To examine the association of muscle strengthening activities with knee extension strength, gait speed, and skeletal muscle index in adultsaged 50-64 and ≥65 years.

Findings

Muscle strengthening activities are linked to better gait speed, knee extension strength, and skeletal muscle index mainly in middle-aged adults (50-64 years), with weaker or no associations in older adults except for higher activity frequency (≥8 sessions/month), benefi tingstrength in those ≥65 years.

Message

Muscle strengthening activities are linked to better physical function and muscle health in middle-aged compared to older adults,although frequency may be a confounding parameter.

Background

This study examined the association of muscle strengthening activities (MSA) with knee extension strength (KES) and gait speed (GS) (n = 2169), and skeletal muscle index (SMI; n = 765) in adults aged 50–64 and ≥ 65 years.

Methods

Data were drawn from the National Health and Nutrition Examination Survey 1999–2018 cycles. MSA were self-reported based on engagement with weightlifting, push-ups, or sit-ups. MSA frequency was categorized as ≥ 8 or < 8 sessions/month. Linear and logistic regressions were performed, adjusting for demographic and clinical covariates.

Results

MSA were associated with improved GS and KES across adults aged 50–64 years in fully adjusted models (GS: β = -0.24, 95% CI − 0.42 to − 0.07; KES: β = 31.7, 95% CI 18.9 to 44.5) but not in those ≥ 65 years (GS: p = 0.07; KES: p = 0.11). For SMI, a significant positive association emerged only in the 50–64-year old group after adjustments (β = 0.18, 95% CI 0.03 to 0.34; ≥ 65 years → p = 0.53). Age interaction (≥ 65 vs. 50–64 years) showed significant MSA associations with GS and KES, though SMI results were inconsistent. Finally, higher MSA frequency for ≥ 65 versus 50–64 years was linked to higher KES (β = 22.0, p = 0.03), but not GS (p = 0.05) or SMI (p = 0.64).

Conclusions

MSA are associated with higher KES and GS in middle-aged, but not in older adults. Higher MSA frequency is linked to increased KES in older adults.