I’ve been staying in Mexico, where limes are everywhere here—served in drinks and squeezed over nearly every dish. That made me curious about the ergonomics of harvesting them.
Naturally, I was intrigued by a recent research paper by Arroyo-Huerta and colleagues examining the lime harvest. In Mexico, approximately 1.6 million workers harvest more than 6 million tons of citrus fruit each year.
Citrus harvest ergonomics
In the traditional lime harvest, about 50% of workers use a bucket to gather fruit. Others use a crate (26%), a cloth bag worn diagonally across the body called an ayate (13%), a backpack (6%), or a basket (5%).
Harvesting exposes workers to several well-known musculoskeletal disorder (MSD) risk factors, including:
- Repetitive hand movements while picking
- Elevated arm postures when reaching into trees
- Trunk flexion when unloading fruit
- Sustained load carriage while transporting harvests
These tasks are typically performed for 6–8 hours per day in hot, humid conditions, which can contribute to fatigue and reduced recovery.
The “Blimper” tool
The researchers evaluated a prototype harvesting tool called a Blimper.
The Blimper is worn “kangaroo-style,” with the fruit carried in front of the body. Adjustable vertical and horizontal straps distribute the load across the shoulders, back, and waist, and the opening is designed to stay open during harvesting. Capacity is approximately 12–15 kg.
The tool was designed to:
- Distribute fruit weight more evenly
- Encourage improved body posture during harvesting
- Allow fruit to be unloaded without bending (from the bottom)
Carrying fruit in front of the body may help workers maintain a more upright posture during unloading, potentially reducing spinal flexion compared with traditional buckets or sacks.
A research trial
Researchers surveyed 93 lime harvesters after three days of using the Blimper. Results were based primarily on worker perceptions of fatigue, usability, and productivity, rather than objective biomechanical measurements.
Most workers reported that they:
- Experienced less back and shoulder fatigue
- Felt the bag did not increase body heat
- Liked the hands-free design, which allowed harvesting at different heights
- Reported good overall fit
However, some workers noted reduced freedom of movement. This reflects a common ergonomics trade-off: improving load distribution can sometimes limit mobility, especially in tasks requiring frequent reaching.
Workers also suggested improvements such as wider shoulder straps, added padding, and better chest adjustment.
Gender considerations
Although the tool was not specifically designed for women, the authors suggested it may help support greater gender participation in citrus harvesting. In this trial, women reported similar or lower fatigue levels than men.
Questions for ergonomists
This prototype raises several interesting questions:
- What is the optimal load capacity before fatigue or balance becomes a concern?
- How does carrying fruit on the front of the torso affect spinal loading, compared with backpack designs?
- Could lighter or more breathable materials improve comfort in hot climates? Could cooling technologies be integrated into the design?
- Would designs based on female anthropometry improve usability?
- If harvesting speed increases, could that increase total daily exposure to repetitive, heavy work?
Why this matters beyond agriculture
While this study focuses on citrus harvesting, similar issues arise wherever workers use wearable load-carrying equipment—including agriculture, warehousing, construction, and waste collection.
Questions about load distribution, unloading posture, heat stress, and mobility are universal when evaluating new tools.
Evaluating new tools in your workplace
Introducing new tools can improve both productivity and worker health—but prototypes should be evaluated carefully.
If you’re testing new equipment in your workplace, we can help design structured trials to gather meaningful feedback from workers and guide next steps.
Contact Carrie@TaylordErgo.com for more information. ¡Salud!
Read the full paper: https://www.mdpi.com/2313-576X/12/2/34