Introduction to Human Anatomy and Physiology

Sample Answer

Hand Grip Strength – Dominant vs Non-Dominant Hand

Abstract

This study aimed to investigate differences in hand grip strength between dominant and non-dominant hands in a healthy adult population, as well as to explore the relationship between anthropometric variables and grip strength. Twenty participants (10 males, 10 females; aged 18–25) were recruited. Hand grip strength was measured using a calibrated dynamometer over three trials per hand, and anthropometric measurements including height, hand width, and forearm length were recorded. Results indicated that the dominant hand exhibited significantly higher mean grip strength (dominant: 42.3 kg, non-dominant: 38.1 kg). Correlation analysis suggested a moderate relationship between hand width and grip strength (r = 0.46). These findings align with anatomical and physiological principles of muscle hypertrophy and neural adaptation in dominant limbs. The study supports the relevance of grip strength measurement in functional health assessments.

Introduction

Hand grip strength is widely regarded as a reliable indicator of overall muscular fitness, neuromuscular coordination, and functional ability (Roberts et al., 2011). The anatomy of the hand and forearm involves multiple intrinsic and extrinsic muscles, including the flexor digitorum superficialis, flexor digitorum profundus, and thenar muscles, which contribute to the generation of grip force. The dominant hand typically exhibits greater strength due to repetitive use, leading to muscle hypertrophy and enhanced motor unit recruitment (Marieb & Hoehn, 2018).

Anthropometric measurements, such as hand width, forearm length, and overall height, can influence grip strength. Longer forearms and wider hands may provide mechanical advantages for force production, while higher body mass is often associated with increased muscle cross-sectional area (Fleck & Kraemer, 2014). Understanding these variables is essential for health and sports assessments, ergonomic design, and rehabilitation planning.

The hypothesis of this study is that the dominant hand will exhibit greater grip strength than the non-dominant hand in a healthy adult population. Additionally, anthropometric factors will correlate positively with grip strength.

Methods

Participants

Twenty healthy adult volunteers (10 males, 10 females), aged 18–25, were recruited. Participants provided informed consent, and ethical guidelines were observed, including anonymisation of data according to GDPR.

Materials

• Hand dynamometer (calibrated)

• Tape measure for anthropometric measurements

• Data recording sheets

Procedure

1. Participants were seated with their shoulder adducted, elbow at 90 degrees, and forearm neutral, as recommended by the American Society of Hand Therapists (ASHT, 1981).

2. Grip strength was measured three times for each hand, alternating hands, with a 30-second rest between trials. The highest value was used for analysis.

3. Anthropometric measurements included:

   • Hand width (distance across metacarpals)

   • Forearm length (olecranon to styloid process)

   • Height

4. Data were recorded in kilograms (kg) for grip strength and centimeters (cm) for anthropometric measures.

Data Analysis

• Mean, median, and standard deviation were calculated for grip strength of both hands.

• Paired t-test determined the significance of differences between dominant and non-dominant hands.

• Pearson correlation examined the relationship between anthropometric variables and grip strength.