0
We're unable to sign you in at this time. Please try again in a few minutes.
Retry
We were able to sign you in, but your subscription(s) could not be found. Please try again in a few minutes.
Retry
There may be a problem with your account. Please contact the AMA Service Center to resolve this issue.
Contact the AMA Service Center:
Telephone: 1 (800) 262-2350 or 1 (312) 670-7827  *   Email: subscriptions@jamanetwork.com
Error Message ......
ARTICLE |

Cardiac Demands of Heavy Snow Shoveling

Barry A. Franklin, PhD; Patrick Hogan, MA; Kim Bonzheim, MSA; Donovan Bakalyar, PhD; Edward Terrien, MD; Seymour Gordon, MD; Gerald C. Timmis, MD
JAMA. 1995;273(11):880-882. doi:10.1001/jama.1995.03520350062030.
Text Size: A A A
Published online

Objective.  —To assess the physiologic responses to manual (shoveling) vs automated (electric snow thrower) snow removal in healthy, untrained men.

Design.  —Observational, controlled trial.

Setting.  —A community-based, acute care, teaching-research hospital.

Participants.  —A volunteer sample of 10 apparently healthy untrained men (mean ±SD age = 32.4±2.1 years) met all eligibility criteria and completed the study.

Intervention.  —Each subject cleared two 10±2-cm-high, 15-m-long tracts of heavy, wet snow in the cold (2°C), using self-paced manual and automated methods, in random order, with 10- to 15-minute rest periods between each 10-minute bout of work.

Main Outcome Measures.  —Heart rate, blood pressure, oxygen uptake, and perceived exertion during snow removal were compared with values obtained during maximal arm-ergometer and treadmill tests.

Results.  —Mean heart rate during shoveling was 154 and 173 beats per minute at 2 and 10 minutes, respectively, corresponding to 86% and 97% of maximal heart rate. Relative heart rate (percentage of maximal heart rate) during shoveling was inversely related to aerobic fitness (r= —0.65; P=.05). The highest heart rate and perceived exertion responses during shoveling, arm-ergometer, and treadmill testing were comparable. Systolic blood pressure during snow shoveling (198±17 mm Hg) was significantly greater (P<.003) than during arm ergometry or automated snow removal and slightly greater than during maximal treadmill testing (181 ±25 mm Hg). Oxygen uptake during shoveling was similar to that for arm ergometry (5.7 vs 6.3 metabolic equivalents), but lower than for treadmill testing (9.3 metabolic equivalents). Cardiorespiratory and perceived exertion responses were reduced during automated snow removal.

Conclusion.  —Heavy snow shoveling elicits myocardial and aerobic demands that rival maximal treadmill and arm-ergometer testing in sedentary men. These responses may contribute to cardiovascular events reported after heavy snowfalls.(JAMA. 1995;273:880-882)

Topics

Sign in

Create a free personal account to sign up for alerts, share articles, and more.

Purchase Options

• Buy this article
• Subscribe to the journal

Figures

Tables

References

CME
Meets CME requirements for:
Browse CME for all U.S. States
Accreditation Information
The American Medical Association is accredited by the Accreditation Council for Continuing Medical Education to provide continuing medical education for physicians. The AMA designates this journal-based CME activity for a maximum of 1 AMA PRA Category 1 CreditTM per course. Physicians should claim only the credit commensurate with the extent of their participation in the activity. Physicians who complete the CME course and score at least 80% correct on the quiz are eligible for AMA PRA Category 1 CreditTM.
Note: You must get at least of the answers correct to pass this quiz.
You have not filled in all the answers to complete this quiz
The following questions were not answered:
Sorry, you have unsuccessfully completed this CME quiz with a score of
The following questions were not answered correctly:
Commitment to Change (optional):
Indicate what change(s) you will implement in your practice, if any, based on this CME course.
Your quiz results:
The filled radio buttons indicate your responses. The preferred responses are highlighted
For CME Course: A Proposed Model for Initial Assessment and Management of Acute Heart Failure Syndromes
Indicate what changes(s) you will implement in your practice, if any, based on this CME course.

Multimedia

Some tools below are only available to our subscribers or users with an online account.

Sign in

Create a free personal account to sign up for alerts, share articles, and more.

Purchase Options

• Buy this article
• Subscribe to the journal

Related Content

Customize your page view by dragging & repositioning the boxes below.

Jobs
brightcove.createExperiences();