Repositorio
Institucional

Marzuca-Nassr, Gabriel Nasri

Caparros-Manosalva, Cristian

Garrido-Munoz, Nicolas

Alvear-Constanzo, Bastian

Sanzana-Laurie, Sofia

Artigas-Arias, Macarena

Alegria-Molina, Andrea

Vidal-Seguel, Nicolas

Espinoza-Araneda, Jessica

Huard, Nolberto

Pagnussat, Aline Souza

Sapunar, Jorge

Salazar, Luis A.

Effects of high-intensity interval training on lean mass, strength, and power of the lower limbs in healthy old and young people

FRONTIERS MEDIA SA

FRONTIERS IN PHYSIOLOGY

en

Introduction: Whether high-intensity interval training (HIIT) can improve lean mass, strength, and power of the lower limbs in young and older people is still under discussion. This study aimed to determine the effect of HIIT on lean mass, maximal strength, rate of force development (RFD), and muscle power of both lower limbs in healthy young and older adults. Secondarily, to compare the effects of HIIT between dominant vs. non-dominant lower limbs of each group.Materials and methods: Healthy older (n = 9, 66 +/- 6 years, BMI 27.1 +/- 3.1 kg m(-2)) and young (n = 9, 21 +/- 1 years, BMI 26.2 +/- 2.8 kg m(-2)) men underwent 12 weeks of HIIT (3x/week) on a stationary bicycle. The evaluations were made before and after the HIIT program by dual energy X-ray absorptiometry (DEXA), anthropometry, force transducer and, Sit-to-Stand test. The outcomes analyzed were limb lean mass, thigh circumference, maximal voluntary isometric strength, RFD (Time intervals: 0-50, 50-100, 100-200, and 0-200 ms), and muscle power in both lower limbs.Results: After 12 weeks of HIIT, non-dominant limb (NDL) showed increase in limb lean mass (p < 0.05) but without interaction (time*group). HIIT showed a gain in absolute maximal strength and also when adjusted for thigh circumference in the dominant lower limb (DL) in both groups. The RFD0-200 ms showed differences between groups but without interaction. The RFD0-50 ms of the NDL showed post-training improvements (p < 0.05) in both groups. Only the older group showed differences between DL vs. NDL in most of the RFD obtained post-intervention. In addition, post-HIIT muscle power gain was observed in both groups (p < 0.05), but mainly in older adults.Conclusion: HIIT promotes increases in lean mass, maximal strength, early RFD, and lower limb muscle power in healthy older and young individuals. The differences shown between the DL and the NDL must be analyzed in future studies.

2023

artículo original

10.3389/fphys.2023.1223069

PDF

high intensity interval training

healthy aging

muscle strength

musculoskeletal system

muscle power

Fisiología

Entrenamiento por intervalos de alta intensidad

envejecimiento saludable

fuerza muscular

sistema musculoesquelético

Poder muscular

artículo original

versión publicada

CC BY 4.0

CC BY 4.0

acceso abierto

acceso abierto

WOS:001083651100001

verde# dorado

Fisiología

UFRO DIUFRO DI18-0068

UFRO PP23-0012

CIES RED21993