Using Isometric Squat Strength to Predict Concentric and Eccentric Squat Strength in Young and Older Adults.

IF 1.5 Q3 REHABILITATION

Physiotherapy Research International Pub Date : 2025-04-01 DOI:10.1002/pri.70034

Michael T Dunn, Phuong T M Quach, Monica McGraw, Richard I Preus, Robert C Barefoot, Winston C Lancaster, Jennifer Ponder, Harshvardhan Singh

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引用次数: 0

Abstract

Background: Resistive squat exercise is a well-established technique to enhance the strength of muscles and bones of the back extensors in humans. Rehabilitation programs aimed at strengthening the muscles and bone of the back require the knowledge of the patient's 1 repetition maximum (RM) of squat exercise. Finding the 1RM value of squat exercise could lead to injury or seem nonfeasible because of the higher weights involved, especially in older adults.

Purpose: To investigate the predictive relationship between the maximum voluntary isometric squat strength and the 1RM concentric and eccentric squat strength in young and older individuals.

Methods: In our cross-sectional study, individuals from two age populations, 21-35 years (young) and 55-75 years (older) were recruited and participated in two visits within a two-week period. Our main outcome measures were: Maximum voluntary isometric squat strength (IsoMax) and 1RM of concentric (ConMax) and eccentric (EccMax) back squat strength were calculated for young and older adults. All the strength measures were normalized for body weight.

Results: IsoMax was a significant predictor of the ConMax (p = 0.003; Normalized ConMax = 0.708 + 1.376(Normalized IsoMax); 95%CI: 0.583-2.169) and EccMax (p = 0.003, Normalized EccMax = 0.844 + 1.433(Normalized IsoMax); 95%CI = 0.582-2.284) in older adults only. There was a trend toward significance for the relationship between IsoMax and ConMax (p = 0.058) in young adults.

Discussion: Our novel findings show that safe techniques for muscle strength assessment, such as maximum voluntary isometric squat strength, can be utilized in older populations to predict their 1RM of concentric and eccentric squat strength. Our novel equations provide the information necessary for designing effective rehabilitation regimes for strengthening the muscles and bone of the back in older adults.

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用等距深蹲力量预测同心和偏心深蹲力量在年轻人和老年人。

背景：抗阻深蹲运动是一种完善的技术，以提高肌肉和骨骼的力量，在人类的背部伸肌。旨在加强背部肌肉和骨骼的康复计划要求患者了解深蹲运动的最大重复量（RM）。发现深蹲运动的1RM值可能会导致受伤，或者因为涉及到更高的重量而看起来不可行，特别是在老年人中。目的：探讨年轻人和老年人最大自主等距深蹲力量与1RM同心和偏心深蹲力量之间的预测关系。方法：在我们的横断面研究中，从21-35岁（年轻人）和55-75岁（老年人）两个年龄人群中招募个体，并在两周内参加两次访问。我们的主要结果测量是：计算年轻人和老年人的最大自主等距深蹲力量（IsoMax）和1RM同心（ConMax）和偏心（EccMax）后蹲力量。所有的力量测量均按体重归一化。结果：IsoMax是ConMax的显著预测因子(p = 0.003；规范化ConMax = 0.708 + 1.376（规范化IsoMax）；95%CI: 0.583-2.169)和EccMax (p = 0.003, Normalized EccMax = 0.844 + 1.433(Normalized IsoMax)；95%CI = 0.582-2.284)。青壮年IsoMax与ConMax的相关性有显著性趋势（p = 0.058）。讨论：我们的新发现表明，安全的肌肉力量评估技术，如最大自主等距深蹲力量，可以用于老年人预测他们的1RM同心和偏心深蹲力量。我们的新方程提供了必要的信息，为设计有效的康复方案，以加强老年人的背部肌肉和骨骼。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physiotherapy Research International REHABILITATION-

CiteScore

3.30

自引率

5.90%

发文量

期刊介绍： Physiotherapy Research International is an international peer reviewed journal dedicated to the exchange of knowledge that is directly relevant to specialist areas of physiotherapy theory, practice, and research. Our aim is to promote a high level of scholarship and build on the current evidence base to inform the advancement of the physiotherapy profession. We publish original research on a wide range of topics e.g. Primary research testing new physiotherapy treatments; methodological research; measurement and outcome research and qualitative research of interest to researchers, clinicians and educators. Further, we aim to publish high quality papers that represent the range of cultures and settings where physiotherapy services are delivered. We attract a wide readership from physiotherapists and others working in diverse clinical and academic settings. We aim to promote an international debate amongst the profession about current best evidence based practice. Papers are directed primarily towards the physiotherapy profession, but can be relevant to a wide range of professional groups. The growth of interdisciplinary research is also key to our aims and scope, and we encourage relevant submissions from other professional groups. The journal actively encourages submissions which utilise a breadth of different methodologies and research designs to facilitate addressing key questions related to the physiotherapy practice. PRI seeks to encourage good quality topical debates on a range of relevant issues and promote critical reflection on decision making and implementation of physiotherapy interventions.